diff --git a/README.md b/README.md
index 4acaecab4..a904c7765 100644
--- a/README.md
+++ b/README.md
@@ -142,6 +142,8 @@ For example, if your disc image was named `Spyro3.cue`, you would place the SBI
 
 CHD images with built-in subchannel information are also supported.
 
+If you are playing directly from a disc and your CD/DVD drive does not support subchannel reading, or has a skew with the returned SubQ, you can place the SBI file in the `subchannel` directory under the user directory, with the serial or title of the game.
+
 ### Cheats and patch database
 
 DuckStation ships with a built-in cheat and patch database, both provided by the community. Contributions to these are welcome at https://github.com/duckstation/chtdb.
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index d0c339cc9..ee052d70a 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -14,6 +14,8 @@ add_library(core
   cdrom.h
   cdrom_async_reader.cpp
   cdrom_async_reader.h
+  cdrom_subq_replacement.cpp
+  cdrom_subq_replacement.h
   cheats.cpp
   cheats.h
   controller.cpp
diff --git a/src/core/cdrom.cpp b/src/core/cdrom.cpp
index 3ccf7c78f..613fc4ff9 100644
--- a/src/core/cdrom.cpp
+++ b/src/core/cdrom.cpp
@@ -3,6 +3,7 @@
 
 #include "cdrom.h"
 #include "cdrom_async_reader.h"
+#include "cdrom_subq_replacement.h"
 #include "dma.h"
 #include "host.h"
 #include "host_interface_progress_callback.h"
@@ -279,11 +280,13 @@ static_assert(sizeof(XA_ADPCMBlockHeader) == 1, "XA-ADPCM block header is one by
 
 static TickCount SoftReset(TickCount ticks_late);
 
+static const CDImage::SubChannelQ& GetSectorSubQ(u32 lba, const CDImage::SubChannelQ& real_subq);
+static bool CanReadMedia();
+
 static bool IsDriveIdle();
 static bool IsMotorOn();
 static bool IsSeeking();
 static bool IsReadingOrPlaying();
-static bool CanReadMedia();
 static bool HasPendingCommand();
 static bool HasPendingInterrupt();
 static bool HasPendingAsyncInterrupt();
@@ -383,6 +386,8 @@ struct CDROMState
                                     &CDROM::DeliverAsyncInterrupt, nullptr};
   TimingEvent drive_event{"CDROM Drive Event", 1, 1, &CDROM::ExecuteDrive, nullptr};
 
+  std::unique_ptr<CDROMSubQReplacement> subq_replacement;
+
   GlobalTicks subq_lba_update_tick = 0;
   GlobalTicks last_interrupt_time = 0;
 
@@ -818,9 +823,19 @@ bool CDROM::HasMedia()
   return s_reader.HasMedia();
 }
 
-const std::string& CDROM::GetMediaFileName()
+const std::string& CDROM::GetMediaPath()
 {
-  return s_reader.GetMediaFileName();
+  return s_reader.GetMediaPath();
+}
+
+u32 CDROM::GetCurrentSubImage()
+{
+  return s_reader.HasMedia() ? s_reader.GetMedia()->GetCurrentSubImage() : 0;
+}
+
+bool CDROM::HasNonStandardOrReplacementSubQ()
+{
+  return ((s_reader.HasMedia() ? s_reader.GetMedia()->HasSubchannelData() : false) || s_state.subq_replacement);
 }
 
 const CDImage* CDROM::GetMedia()
@@ -884,14 +899,21 @@ bool CDROM::CanReadMedia()
   return (s_state.drive_state != DriveState::ShellOpening && s_reader.HasMedia());
 }
 
-void CDROM::InsertMedia(std::unique_ptr<CDImage> media, DiscRegion region)
+bool CDROM::InsertMedia(std::unique_ptr<CDImage> media, DiscRegion region, std::string_view serial,
+                        std::string_view title, Error* error)
 {
+  // Load SBI/LSD first.
+  std::unique_ptr<CDROMSubQReplacement> subq;
+  if (!media->HasSubchannelData() && !CDROMSubQReplacement::LoadForImage(&subq, media.get(), serial, title, error))
+    return false;
+
   if (CanReadMedia())
     RemoveMedia(true);
 
   INFO_LOG("Inserting new media, disc region: {}, console region: {}", Settings::GetDiscRegionName(region),
            Settings::GetConsoleRegionName(System::GetRegion()));
 
+  s_state.subq_replacement = std::move(subq);
   s_state.disc_region = region;
   s_reader.SetMedia(std::move(media));
   SetHoldPosition(0, true);
@@ -902,12 +924,14 @@ void CDROM::InsertMedia(std::unique_ptr<CDImage> media, DiscRegion region)
 
   if (s_state.show_current_file)
     CreateFileMap();
+
+  return true;
 }
 
 std::unique_ptr<CDImage> CDROM::RemoveMedia(bool for_disc_swap)
 {
   if (!HasMedia())
-    return nullptr;
+    return {};
 
   // Add an additional two seconds to the disc swap, some games don't like it happening too quickly.
   TickCount stop_ticks = GetTicksForStop(true);
@@ -926,6 +950,7 @@ std::unique_ptr<CDImage> CDROM::RemoveMedia(bool for_disc_swap)
   s_state.secondary_status.shell_open = true;
   s_state.secondary_status.ClearActiveBits();
   s_state.disc_region = DiscRegion::NonPS1;
+  s_state.subq_replacement.reset();
 
   // If the drive was doing anything, we need to abort the command.
   ClearDriveState();
@@ -956,7 +981,7 @@ bool CDROM::PrecacheMedia()
   {
     Host::AddOSDMessage(
       fmt::format(TRANSLATE_FS("OSDMessage", "CD image preloading not available for multi-disc image '{}'"),
-                  FileSystem::GetDisplayNameFromPath(s_reader.GetMedia()->GetFileName())),
+                  FileSystem::GetDisplayNameFromPath(s_reader.GetMedia()->GetPath())),
       Host::OSD_ERROR_DURATION);
     return false;
   }
@@ -972,6 +997,17 @@ bool CDROM::PrecacheMedia()
   return true;
 }
 
+const CDImage::SubChannelQ& CDROM::GetSectorSubQ(u32 lba, const CDImage::SubChannelQ& real_subq)
+{
+  if (s_state.subq_replacement)
+  {
+    const CDImage::SubChannelQ* replacement_subq = s_state.subq_replacement->GetReplacementSubQ(lba);
+    return replacement_subq ? *replacement_subq : real_subq;
+  }
+
+  return real_subq;
+}
+
 TinyString CDROM::LBAToMSFString(CDImage::LBA lba)
 {
   const auto pos = CDImage::Position::FromLBA(lba);
@@ -2721,10 +2757,12 @@ void CDROM::UpdateSubQPositionWhileSeeking()
           current_lba, completed_frac);
 
   // access the image directly since we want to preserve the cached data for the seek complete
-  CDImage::SubChannelQ subq;
-  if (!s_reader.ReadSectorUncached(current_lba, &subq, nullptr))
+  CDImage::SubChannelQ real_subq = {};
+  if (!s_reader.ReadSectorUncached(current_lba, &real_subq, nullptr))
     ERROR_LOG("Failed to read subq for sector {} for subq position", current_lba);
-  else if (subq.IsCRCValid())
+
+  const CDImage::SubChannelQ& subq = GetSectorSubQ(current_lba, real_subq);
+  if (subq.IsCRCValid())
     s_state.last_subq = subq;
 
   s_state.current_lba = current_lba;
@@ -2776,14 +2814,15 @@ void CDROM::UpdateSubQPosition(bool update_logical)
     {
       s_state.current_subq_lba = new_subq_lba;
 
-      CDImage::SubChannelQ subq;
+      CDImage::SubChannelQ real_subq = {};
       CDROMAsyncReader::SectorBuffer raw_sector;
-      if (!s_reader.ReadSectorUncached(new_subq_lba, &subq, update_logical ? &raw_sector : nullptr))
+      if (!s_reader.ReadSectorUncached(new_subq_lba, &real_subq, update_logical ? &raw_sector : nullptr))
       {
         ERROR_LOG("Failed to read subq for sector {} for subq position", new_subq_lba);
       }
       else
       {
+        const CDImage::SubChannelQ& subq = GetSectorSubQ(new_subq_lba, real_subq);
         if (subq.IsCRCValid())
           s_state.last_subq = subq;
 
@@ -2801,10 +2840,12 @@ void CDROM::SetHoldPosition(CDImage::LBA lba, bool update_subq)
 {
   if (update_subq && s_state.current_subq_lba != lba && CanReadMedia())
   {
-    CDImage::SubChannelQ subq;
-    if (!s_reader.ReadSectorUncached(lba, &subq, nullptr))
+    CDImage::SubChannelQ real_subq = {};
+    if (!s_reader.ReadSectorUncached(lba, &real_subq, nullptr))
       ERROR_LOG("Failed to read subq for sector {} for subq position", lba);
-    else if (subq.IsCRCValid())
+
+    const CDImage::SubChannelQ& subq = GetSectorSubQ(lba, real_subq);
+    if (subq.IsCRCValid())
       s_state.last_subq = subq;
   }
 
@@ -2831,13 +2872,13 @@ bool CDROM::CompleteSeek()
   bool seek_okay = s_reader.WaitForReadToComplete();
   if (seek_okay)
   {
-    const CDImage::SubChannelQ& subq = s_reader.GetSectorSubQ();
+    const CDImage::SubChannelQ& subq = GetSectorSubQ(s_reader.GetLastReadSector(), s_reader.GetSectorSubQ());
     if (subq.IsCRCValid())
     {
       // seek and update sub-q for ReadP command
       s_state.last_subq = subq;
       const auto [seek_mm, seek_ss, seek_ff] = CDImage::Position::FromLBA(s_reader.GetLastReadSector()).ToBCD();
-      seek_okay = (subq.IsCRCValid() && subq.absolute_minute_bcd == seek_mm && subq.absolute_second_bcd == seek_ss &&
+      seek_okay = (subq.absolute_minute_bcd == seek_mm && subq.absolute_second_bcd == seek_ss &&
                    subq.absolute_frame_bcd == seek_ff);
       if (seek_okay)
       {
@@ -3064,7 +3105,7 @@ void CDROM::DoSectorRead()
 
   s_state.secondary_status.SetReadingBits(s_state.drive_state == DriveState::Playing);
 
-  const CDImage::SubChannelQ& subq = s_reader.GetSectorSubQ();
+  const CDImage::SubChannelQ& subq = GetSectorSubQ(s_state.current_lba, s_reader.GetSectorSubQ());
   const bool subq_valid = subq.IsCRCValid();
   if (subq_valid)
   {
@@ -3128,8 +3169,7 @@ void CDROM::DoSectorRead()
     else if (subq.track_number_bcd != s_state.play_track_number_bcd)
     {
       // we don't want to update the position if the track changes, so we check it before reading the actual sector.
-      DEV_LOG("Auto pause at the start of track {:02x} (LBA {})", s_state.last_subq.track_number_bcd,
-              s_state.current_lba);
+      DEV_LOG("Auto pause at the start of track {:02x} (LBA {})", subq.track_number_bcd, s_state.current_lba);
       StopReadingWithDataEnd();
       return;
     }
@@ -3759,7 +3799,7 @@ void CDROM::CreateFileMap()
     return;
   }
 
-  DEV_LOG("Creating file map for {}...", media->GetFileName());
+  DEV_LOG("Creating file map for {}...", media->GetPath());
   s_state.file_map.emplace(iso.GetPVDLBA(), std::make_pair(iso.GetPVDLBA(), std::string("PVD")));
   CreateFileMap(iso, std::string_view());
   DEV_LOG("Found {} files", s_state.file_map.size());
@@ -3825,13 +3865,12 @@ void CDROM::DrawDebugWindow(float scale)
 
       if (media->HasSubImages())
       {
-        ImGui::Text("Filename: %s [Subimage %u of %u] [%u buffered sectors]", media->GetFileName().c_str(),
+        ImGui::Text("Filename: %s [Subimage %u of %u] [%u buffered sectors]", media->GetPath().c_str(),
                     media->GetCurrentSubImage() + 1u, media->GetSubImageCount(), s_reader.GetBufferedSectorCount());
       }
       else
       {
-        ImGui::Text("Filename: %s [%u buffered sectors]", media->GetFileName().c_str(),
-                    s_reader.GetBufferedSectorCount());
+        ImGui::Text("Filename: %s [%u buffered sectors]", media->GetPath().c_str(), s_reader.GetBufferedSectorCount());
       }
 
       ImGui::Text("Disc Position: MSF[%02u:%02u:%02u] LBA[%u]", disc_position.minute, disc_position.second,
diff --git a/src/core/cdrom.h b/src/core/cdrom.h
index 893d25b69..04e8854e3 100644
--- a/src/core/cdrom.h
+++ b/src/core/cdrom.h
@@ -2,11 +2,15 @@
 // SPDX-License-Identifier: CC-BY-NC-ND-4.0
 
 #pragma once
+
 #include "types.h"
+
 #include <memory>
 #include <string>
 #include <tuple>
+#include <utility>
 
+class Error;
 class CDImage;
 class StateWrapper;
 
@@ -18,16 +22,19 @@ void Reset();
 bool DoState(StateWrapper& sw);
 
 bool HasMedia();
-const std::string& GetMediaFileName();
+const std::string& GetMediaPath();
+u32 GetCurrentSubImage();
 const CDImage* GetMedia();
 DiscRegion GetDiscRegion();
 bool IsMediaPS1Disc();
 bool IsMediaAudioCD();
 bool DoesMediaRegionMatchConsole();
 
-void InsertMedia(std::unique_ptr<CDImage> media, DiscRegion region);
+bool InsertMedia(std::unique_ptr<CDImage> media, DiscRegion region, std::string_view serial, std::string_view title,
+                 Error* error);
 std::unique_ptr<CDImage> RemoveMedia(bool for_disc_swap);
 bool PrecacheMedia();
+bool HasNonStandardOrReplacementSubQ();
 
 void CPUClockChanged();
 
diff --git a/src/core/cdrom_async_reader.h b/src/core/cdrom_async_reader.h
index 5e93405b9..efebc41ec 100644
--- a/src/core/cdrom_async_reader.h
+++ b/src/core/cdrom_async_reader.h
@@ -37,7 +37,7 @@ public:
   bool HasMedia() const { return static_cast<bool>(m_media); }
   const CDImage* GetMedia() const { return m_media.get(); }
   CDImage* GetMedia() { return m_media.get(); }
-  const std::string& GetMediaFileName() const { return m_media->GetFileName(); }
+  const std::string& GetMediaPath() const { return m_media->GetPath(); }
 
   bool IsUsingThread() const { return m_read_thread.joinable(); }
   void StartThread(u32 readahead_count = 8);
diff --git a/src/core/cdrom_subq_replacement.cpp b/src/core/cdrom_subq_replacement.cpp
new file mode 100644
index 000000000..0def0659e
--- /dev/null
+++ b/src/core/cdrom_subq_replacement.cpp
@@ -0,0 +1,204 @@
+// SPDX-FileCopyrightText: 2019-2024 Connor McLaughlin <stenzek@gmail.com>
+// SPDX-License-Identifier: CC-BY-NC-ND-4.0
+
+#include "cdrom_subq_replacement.h"
+#include "settings.h"
+
+#include "common/error.h"
+#include "common/file_system.h"
+#include "common/log.h"
+#include "common/path.h"
+#include "common/small_string.h"
+
+#include <algorithm>
+#include <array>
+#include <memory>
+
+LOG_CHANNEL(CDROM);
+
+#pragma pack(push, 1)
+struct SBIFileEntry
+{
+  u8 minute_bcd;
+  u8 second_bcd;
+  u8 frame_bcd;
+  u8 type;
+  u8 data[10];
+};
+struct LSDFileEntry
+{
+  u8 minute_bcd;
+  u8 second_bcd;
+  u8 frame_bcd;
+  u8 data[12];
+};
+static_assert(sizeof(LSDFileEntry) == 15);
+#pragma pack(pop)
+
+CDROMSubQReplacement::CDROMSubQReplacement() = default;
+
+CDROMSubQReplacement::~CDROMSubQReplacement() = default;
+
+std::unique_ptr<CDROMSubQReplacement> CDROMSubQReplacement::LoadSBI(const std::string& path, Error* error)
+{
+  auto fp = FileSystem::OpenManagedCFile(path.c_str(), "rb", error);
+  if (!fp)
+    return {};
+
+  static constexpr char expected_header[] = {'S', 'B', 'I', '\0'};
+
+  char header[4];
+  if (std::fread(header, sizeof(header), 1, fp.get()) != 1 || std::memcmp(header, expected_header, sizeof(header)) != 0)
+  {
+    Error::SetStringFmt(error, "Invalid header in '{}'", Path::GetFileName(path));
+    return {};
+  }
+
+  std::unique_ptr<CDROMSubQReplacement> ret = std::make_unique<CDROMSubQReplacement>();
+
+  SBIFileEntry entry;
+  while (std::fread(&entry, sizeof(entry), 1, fp.get()) == 1)
+  {
+    if (!IsValidPackedBCD(entry.minute_bcd) || !IsValidPackedBCD(entry.second_bcd) ||
+        !IsValidPackedBCD(entry.frame_bcd))
+    {
+      Error::SetStringFmt(error, "Invalid position [{:02x}:{:02x}:{:02x}] in '{}'", entry.minute_bcd, entry.second_bcd,
+                          entry.frame_bcd, Path::GetFileName(path));
+      return {};
+    }
+
+    if (entry.type != 1)
+    {
+      Error::SetStringFmt(error, "Invalid type 0x{:02X} in '{}'", entry.type, Path::GetFileName(path));
+      return {};
+    }
+
+    const u32 lba = CDImage::Position::FromBCD(entry.minute_bcd, entry.second_bcd, entry.frame_bcd).ToLBA();
+
+    CDImage::SubChannelQ subq;
+    std::memcpy(subq.data.data(), entry.data, sizeof(entry.data));
+
+    // generate an invalid crc by flipping all bits from the valid crc (will never collide)
+    const u16 crc = subq.ComputeCRC(subq.data) ^ 0xFFFF;
+    subq.data[10] = Truncate8(crc);
+    subq.data[11] = Truncate8(crc >> 8);
+
+    ret->m_replacement_subq.emplace(lba, subq);
+  }
+
+  INFO_LOG("Loaded {} replacement sectors from SBI '{}'", ret->m_replacement_subq.size(), Path::GetFileName(path));
+  return ret;
+}
+
+std::unique_ptr<CDROMSubQReplacement> CDROMSubQReplacement::LoadLSD(const std::string& path, Error* error)
+{
+  auto fp = FileSystem::OpenManagedCFile(path.c_str(), "rb", error);
+  if (!fp)
+    return {};
+
+  std::unique_ptr<CDROMSubQReplacement> ret = std::make_unique<CDROMSubQReplacement>();
+
+  LSDFileEntry entry;
+  while (std::fread(&entry, sizeof(entry), 1, fp.get()) == 1)
+  {
+    if (!IsValidPackedBCD(entry.minute_bcd) || !IsValidPackedBCD(entry.second_bcd) ||
+        !IsValidPackedBCD(entry.frame_bcd))
+    {
+      Error::SetStringFmt(error, "Invalid position [{:02x}:{:02x}:{:02x}] in '{}'", entry.minute_bcd, entry.second_bcd,
+                          entry.frame_bcd, Path::GetFileName(path));
+      return {};
+    }
+
+    const u32 lba = CDImage::Position::FromBCD(entry.minute_bcd, entry.second_bcd, entry.frame_bcd).ToLBA();
+
+    CDImage::SubChannelQ subq;
+    std::memcpy(subq.data.data(), entry.data, sizeof(entry.data));
+
+    DEBUG_LOG("{:02x}:{:02x}:{:02x}: CRC {}", entry.minute_bcd, entry.second_bcd, entry.frame_bcd,
+              subq.IsCRCValid() ? "VALID" : "INVALID");
+    ret->m_replacement_subq.emplace(lba, subq);
+  }
+
+  INFO_LOG("Loaded {} replacement sectors from LSD '{}'", ret->m_replacement_subq.size(), path);
+  return ret;
+}
+
+bool CDROMSubQReplacement::LoadForImage(std::unique_ptr<CDROMSubQReplacement>* ret, CDImage* image, std::string_view serial,
+                                   std::string_view title, Error* error)
+{
+  struct FileLoader
+  {
+    const char* extension;
+    std::unique_ptr<CDROMSubQReplacement> (*func)(const std::string&, Error*);
+  };
+  static constexpr const FileLoader loaders[] = {
+    {"sbi", &CDROMSubQReplacement::LoadSBI},
+    {"lsd", &CDROMSubQReplacement::LoadLSD},
+  };
+
+  const std::string& image_path = image->GetPath();
+  std::string path;
+
+  // Try sbi/lsd in the directory first.
+  for (const FileLoader& loader : loaders)
+  {
+    path = Path::ReplaceExtension(image_path, loader.extension);
+    if (FileSystem::FileExists(path.c_str()))
+    {
+      *ret = loader.func(path, error);
+      return static_cast<bool>(*ret);
+    }
+  }
+
+  // For subimages, we need to check the suffix too.
+  if (image->HasSubImages())
+  {
+    for (const FileLoader& loader : loaders)
+    {
+      path = Path::BuildRelativePath(image_path,
+                                     SmallString::from_format("{}_{}.{}", Path::GetFileName(image_path),
+                                                              image->GetCurrentSubImage() + 1, loader.extension));
+      if (FileSystem::FileExists(path.c_str()))
+      {
+        *ret = loader.func(path, error);
+        return static_cast<bool>(*ret);
+      }
+    }
+  }
+
+  // If this fails, try the subchannel directory with serial/title.
+  if (!serial.empty())
+  {
+    for (const FileLoader& loader : loaders)
+    {
+      path = Path::Combine(EmuFolders::Subchannels, TinyString::from_format("{}.{}", serial, loader.extension));
+      if (FileSystem::FileExists(path.c_str()))
+      {
+        *ret = loader.func(path, error);
+        return static_cast<bool>(*ret);
+      }
+    }
+  }
+
+  if (!title.empty())
+  {
+    for (const FileLoader& loader : loaders)
+    {
+      path = Path::Combine(EmuFolders::Subchannels, TinyString::from_format("{}.{}", title, loader.extension));
+      if (FileSystem::FileExists(path.c_str()))
+      {
+        *ret = loader.func(path, error);
+        return static_cast<bool>(*ret);
+      }
+    }
+  }
+
+  // Nothing.
+  return true;
+}
+
+const CDImage::SubChannelQ* CDROMSubQReplacement::GetReplacementSubQ(u32 lba) const
+{
+  const auto iter = m_replacement_subq.find(lba);
+  return (iter != m_replacement_subq.end()) ? &iter->second : nullptr;
+}
diff --git a/src/core/cdrom_subq_replacement.h b/src/core/cdrom_subq_replacement.h
new file mode 100644
index 000000000..e4aae425a
--- /dev/null
+++ b/src/core/cdrom_subq_replacement.h
@@ -0,0 +1,32 @@
+// SPDX-FileCopyrightText: 2019-2024 Connor McLaughlin <stenzek@gmail.com>
+// SPDX-License-Identifier: CC-BY-NC-ND-4.0
+
+#pragma once
+
+#include "util/cd_image.h"
+
+#include <unordered_map>
+
+class CDROMSubQReplacement
+{
+public:
+  CDROMSubQReplacement();
+  ~CDROMSubQReplacement();
+
+  // NOTE: Can return true if no sbi is available, false means load/parse error.
+  static bool LoadForImage(std::unique_ptr<CDROMSubQReplacement>* ret, CDImage* image, std::string_view serial,
+                           std::string_view title, Error* error);
+
+  size_t GetReplacementSectorCount() const { return m_replacement_subq.size(); }
+
+  /// Returns the replacement subchannel data for the specified sector.
+  const CDImage::SubChannelQ* GetReplacementSubQ(u32 lba) const;
+
+private:
+  using ReplacementMap = std::unordered_map<u32, CDImage::SubChannelQ>;
+
+  static std::unique_ptr<CDROMSubQReplacement> LoadSBI(const std::string& path, Error* error);
+  static std::unique_ptr<CDROMSubQReplacement> LoadLSD(const std::string& path, Error* error);
+
+  ReplacementMap m_replacement_subq;
+};
diff --git a/src/core/core.vcxproj b/src/core/core.vcxproj
index 14819076d..1aa26de27 100644
--- a/src/core/core.vcxproj
+++ b/src/core/core.vcxproj
@@ -9,6 +9,7 @@
     <ClCompile Include="bus.cpp" />
     <ClCompile Include="cdrom.cpp" />
     <ClCompile Include="cdrom_async_reader.cpp" />
+    <ClCompile Include="cdrom_subq_replacement.cpp" />
     <ClCompile Include="cheats.cpp" />
     <ClCompile Include="cpu_core.cpp" />
     <ClCompile Include="cpu_disasm.cpp" />
@@ -95,6 +96,7 @@
     <ClInclude Include="bus.h" />
     <ClInclude Include="cdrom.h" />
     <ClInclude Include="cdrom_async_reader.h" />
+    <ClInclude Include="cdrom_subq_replacement.h" />
     <ClInclude Include="cheats.h" />
     <ClInclude Include="achievements.h" />
     <ClInclude Include="cpu_code_cache_private.h" />
diff --git a/src/core/core.vcxproj.filters b/src/core/core.vcxproj.filters
index 53e35e9dd..38904fbac 100644
--- a/src/core/core.vcxproj.filters
+++ b/src/core/core.vcxproj.filters
@@ -69,6 +69,7 @@
     <ClCompile Include="gpu_hw_texture_cache.cpp" />
     <ClCompile Include="memory_scanner.cpp" />
     <ClCompile Include="gpu_dump.cpp" />
+    <ClCompile Include="cdrom_subq_replacement.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="types.h" />
@@ -144,6 +145,7 @@
     <ClInclude Include="gpu_hw_texture_cache.h" />
     <ClInclude Include="memory_scanner.h" />
     <ClInclude Include="gpu_dump.h" />
+    <ClInclude Include="cdrom_subq_replacement.h" />
   </ItemGroup>
   <ItemGroup>
     <None Include="gpu_sw_rasterizer.inl" />
diff --git a/src/core/settings.cpp b/src/core/settings.cpp
index 2a7fff5da..0144056e5 100644
--- a/src/core/settings.cpp
+++ b/src/core/settings.cpp
@@ -2142,6 +2142,7 @@ std::string EmuFolders::Resources;
 std::string EmuFolders::SaveStates;
 std::string EmuFolders::Screenshots;
 std::string EmuFolders::Shaders;
+std::string EmuFolders::Subchannels;
 std::string EmuFolders::Textures;
 std::string EmuFolders::UserResources;
 std::string EmuFolders::Videos;
@@ -2160,6 +2161,7 @@ void EmuFolders::SetDefaults()
   SaveStates = Path::Combine(DataRoot, "savestates");
   Screenshots = Path::Combine(DataRoot, "screenshots");
   Shaders = Path::Combine(DataRoot, "shaders");
+  Subchannels = Path::Combine(DataRoot, "subchannels");
   Textures = Path::Combine(DataRoot, "textures");
   UserResources = Path::Combine(DataRoot, "resources");
   Videos = Path::Combine(DataRoot, "videos");
@@ -2191,6 +2193,7 @@ void EmuFolders::LoadConfig(SettingsInterface& si)
   SaveStates = LoadPathFromSettings(si, DataRoot, "Folders", "SaveStates", "savestates");
   Screenshots = LoadPathFromSettings(si, DataRoot, "Folders", "Screenshots", "screenshots");
   Shaders = LoadPathFromSettings(si, DataRoot, "Folders", "Shaders", "shaders");
+  Subchannels = LoadPathFromSettings(si, DataRoot, "Folders", "Subchannels", "subchannels");
   Textures = LoadPathFromSettings(si, DataRoot, "Folders", "Textures", "textures");
   UserResources = LoadPathFromSettings(si, DataRoot, "Folders", "UserResources", "resources");
   Videos = LoadPathFromSettings(si, DataRoot, "Folders", "Videos", "videos");
@@ -2208,6 +2211,7 @@ void EmuFolders::LoadConfig(SettingsInterface& si)
   DEV_LOG("SaveStates Directory: {}", SaveStates);
   DEV_LOG("Screenshots Directory: {}", Screenshots);
   DEV_LOG("Shaders Directory: {}", Shaders);
+  DEV_LOG("Subchannels Directory: {}", Subchannels);
   DEV_LOG("Textures Directory: {}", Textures);
   DEV_LOG("User Resources Directory: {}", UserResources);
   DEV_LOG("Videos Directory: {}", Videos);
@@ -2228,6 +2232,7 @@ void EmuFolders::Save(SettingsInterface& si)
   si.SetStringValue("Folders", "SaveStates", Path::MakeRelative(SaveStates, DataRoot).c_str());
   si.SetStringValue("Folders", "Screenshots", Path::MakeRelative(Screenshots, DataRoot).c_str());
   si.SetStringValue("Folders", "Shaders", Path::MakeRelative(Shaders, DataRoot).c_str());
+  si.SetStringValue("Folders", "Subchannels", Path::MakeRelative(Subchannels, DataRoot).c_str());
   si.SetStringValue("Folders", "Textures", Path::MakeRelative(Textures, DataRoot).c_str());
   si.SetStringValue("Folders", "UserResources", Path::MakeRelative(UserResources, DataRoot).c_str());
   si.SetStringValue("Folders", "Videos", Path::MakeRelative(Videos, DataRoot).c_str());
@@ -2275,6 +2280,7 @@ bool EmuFolders::EnsureFoldersExist()
   result = FileSystem::EnsureDirectoryExists(
              Path::Combine(Shaders, "reshade" FS_OSPATH_SEPARATOR_STR "Textures").c_str(), false) &&
            result;
+  result = FileSystem::EnsureDirectoryExists(Subchannels.c_str(), false) && result;
   result = FileSystem::EnsureDirectoryExists(Textures.c_str(), false) && result;
   result = FileSystem::EnsureDirectoryExists(UserResources.c_str(), false) && result;
   result = FileSystem::EnsureDirectoryExists(Videos.c_str(), false) && result;
diff --git a/src/core/settings.h b/src/core/settings.h
index f99113e74..1f82f8fd5 100644
--- a/src/core/settings.h
+++ b/src/core/settings.h
@@ -578,6 +578,7 @@ extern std::string Resources;
 extern std::string SaveStates;
 extern std::string Screenshots;
 extern std::string Shaders;
+extern std::string Subchannels;
 extern std::string Textures;
 extern std::string UserResources;
 extern std::string Videos;
diff --git a/src/core/system.cpp b/src/core/system.cpp
index 029a78a82..840e32bee 100644
--- a/src/core/system.cpp
+++ b/src/core/system.cpp
@@ -157,7 +157,8 @@ static void WarnAboutStateTaints(u32 state_taints);
 static void WarnAboutUnsafeSettings();
 static void LogUnsafeSettingsToConsole(const SmallStringBase& messages);
 
-static bool Initialize(bool force_software_renderer, bool fullscreen, Error* error);
+static bool Initialize(std::unique_ptr<CDImage> disc, DiscRegion disc_region, bool force_software_renderer,
+                       bool fullscreen, Error* error);
 static bool LoadBIOS(Error* error);
 static bool SetBootMode(BootMode new_boot_mode, DiscRegion disc_region, Error* error);
 static void InternalReset();
@@ -187,7 +188,7 @@ static void ResetPerformanceCounters();
 
 static bool UpdateGameSettingsLayer();
 static void UpdateRunningGame(const std::string_view path, CDImage* image, bool booting);
-static bool CheckForSBIFile(CDImage* image, Error* error);
+static bool CheckForRequiredSubQ(Error* error);
 
 static void UpdateControllers();
 static void ResetControllers();
@@ -1810,7 +1811,7 @@ bool System::BootSystem(SystemBootParameters parameters, Error* error)
   }
 
   // Update running game, this will apply settings as well.
-  UpdateRunningGame(disc ? disc->GetFileName().c_str() : parameters.filename.c_str(), disc.get(), true);
+  UpdateRunningGame(disc ? disc->GetPath().c_str() : parameters.filename.c_str(), disc.get(), true);
 
   // Get boot EXE override.
   if (!parameters.override_exe.empty())
@@ -1828,13 +1829,6 @@ bool System::BootSystem(SystemBootParameters parameters, Error* error)
     exe_override = std::move(parameters.override_exe);
   }
 
-  // Check for SBI.
-  if (!CheckForSBIFile(disc.get(), error))
-  {
-    DestroySystem();
-    return false;
-  }
-
   // Check for resuming with hardcore mode.
   if (parameters.disable_achievements_hardcore_mode)
     Achievements::DisableHardcoreMode();
@@ -1871,25 +1865,16 @@ bool System::BootSystem(SystemBootParameters parameters, Error* error)
     }
   }
 
-  // Load BIOS image.
-  if (!SetBootMode(boot_mode, disc_region, error))
+  // Load BIOS image, component setup, check for subchannel in games that need it.
+  if (!SetBootMode(boot_mode, disc_region, error) ||
+      !Initialize(std::move(disc), disc_region, parameters.force_software_renderer,
+                  parameters.override_fullscreen.value_or(ShouldStartFullscreen()), error) ||
+      !CheckForRequiredSubQ(error))
   {
     DestroySystem();
     return false;
   }
 
-  // Component setup.
-  if (!Initialize(parameters.force_software_renderer, parameters.override_fullscreen.value_or(ShouldStartFullscreen()),
-                  error))
-  {
-    DestroySystem();
-    return false;
-  }
-
-  // Insert disc.
-  if (disc)
-    CDROM::InsertMedia(std::move(disc), disc_region);
-
   s_exe_override = std::move(exe_override);
 
   UpdateControllers();
@@ -1944,7 +1929,8 @@ bool System::BootSystem(SystemBootParameters parameters, Error* error)
   return true;
 }
 
-bool System::Initialize(bool force_software_renderer, bool fullscreen, Error* error)
+bool System::Initialize(std::unique_ptr<CDImage> disc, DiscRegion disc_region, bool force_software_renderer,
+                        bool fullscreen, Error* error)
 {
   g_ticks_per_second = ScaleTicksToOverclock(MASTER_CLOCK);
   s_max_slice_ticks = ScaleTicksToOverclock(MASTER_CLOCK / 10);
@@ -1993,6 +1979,11 @@ bool System::Initialize(bool force_software_renderer, bool fullscreen, Error* er
 
   Bus::Initialize();
   CPU::Initialize();
+  CDROM::Initialize();
+
+  // CDROM before GPU, that way we don't modeswitch.
+  if (disc && !CDROM::InsertMedia(std::move(disc), disc_region, s_running_game_serial, s_running_game_title, error))
+    return false;
 
   if (!CreateGPU(force_software_renderer ? GPURenderer::Software : g_settings.gpu_renderer, false, fullscreen, error))
     return false;
@@ -2004,10 +1995,12 @@ bool System::Initialize(bool force_software_renderer, bool fullscreen, Error* er
 
   // Was startup cancelled? (e.g. shading compilers took too long and the user closed the application)
   if (IsStartupCancelled())
+  {
+    Error::SetStringView(error, TRANSLATE_SV("System", "Startup was cancelled."));
     return false;
+  }
 
   DMA::Initialize();
-  CDROM::Initialize();
   Pad::Initialize();
   Timers::Initialize();
   SPU::Initialize();
@@ -2810,71 +2803,57 @@ bool System::LoadStateFromBuffer(const SaveStateBuffer& buffer, Error* error, bo
 {
   Assert(IsValid());
 
-  std::unique_ptr<CDImage> media;
-  std::unique_ptr<CDImage> old_media = CDROM::RemoveMedia(false);
   std::string_view media_path = buffer.media_path;
-  u32 media_subimage_index = buffer.media_subimage_index;
-  if (old_media && old_media->GetFileName() == buffer.media_path)
+  u32 media_subimage_index = (buffer.version >= 51) ? buffer.media_subimage_index : 0;
+  if (!buffer.media_path.empty())
   {
-    INFO_LOG("Re-using same media '{}'", buffer.media_path);
-    media = std::move(old_media);
-  }
-  else if (!buffer.media_path.empty())
-  {
-    Error local_error;
-    media = CDImage::Open(buffer.media_path.c_str(), g_settings.cdrom_load_image_patches, error ? error : &local_error);
-    if (!media)
+    if (CDROM::HasMedia() && CDROM::GetMediaPath() == buffer.media_path &&
+        CDROM::GetCurrentSubImage() == media_subimage_index)
     {
-      if (old_media)
-      {
-        Host::AddOSDMessage(
-          fmt::format(TRANSLATE_FS("OSDMessage", "Failed to open CD image from save state '{}': {}.\nUsing "
-                                                 "existing image '{}', this may result in instability."),
-                      buffer.media_path, error ? error->GetDescription() : local_error.GetDescription(),
-                      old_media->GetFileName()),
-          Host::OSD_CRITICAL_ERROR_DURATION);
-        media = std::move(old_media);
-        media_path = media->GetFileName();
-        media_subimage_index = media->GetCurrentSubImage();
-      }
-      else
-      {
-        Error::AddPrefixFmt(error, TRANSLATE_FS("System", "Failed to open CD image '{}' used by save state:\n"),
-                            Path::GetFileName(buffer.media_path));
-        return false;
-      }
-    }
-  }
-
-  if (media && buffer.version >= 51)
-  {
-    const u32 num_subimages = media->HasSubImages() ? media->GetSubImageCount() : 1;
-    if (media_subimage_index >= num_subimages ||
-        (media->HasSubImages() && media->GetCurrentSubImage() != media_subimage_index &&
-         !media->SwitchSubImage(media_subimage_index, error)))
-    {
-      Error::AddPrefixFmt(
-        error, TRANSLATE_FS("System", "Failed to switch to subimage {} in CD image '{}' used by save state:\n"),
-        media_subimage_index + 1u, Path::GetFileName(media_path));
-      return false;
+      INFO_LOG("Re-using same media '{}'", CDROM::GetMediaPath());
     }
     else
     {
-      INFO_LOG("Switched to subimage {} in '{}'", media_subimage_index, buffer.media_path.c_str());
+      // needs new image
+      Error local_error;
+      std::unique_ptr<CDImage> new_disc =
+        CDImage::Open(buffer.media_path.c_str(), g_settings.cdrom_load_image_patches, error ? error : &local_error);
+      const DiscRegion new_disc_region =
+        new_disc ? GameList::GetCustomRegionForPath(buffer.media_path).value_or(GetRegionForImage(new_disc.get())) :
+                   DiscRegion::NonPS1;
+      if (!new_disc ||
+          (media_subimage_index != 0 && new_disc->HasSubImages() &&
+           !new_disc->SwitchSubImage(media_subimage_index, error ? error : &local_error)) ||
+          (UpdateRunningGame(buffer.media_path, new_disc.get(), false),
+           !CDROM::InsertMedia(std::move(new_disc), new_disc_region, s_running_game_serial, s_running_game_title,
+                               error ? error : &local_error)))
+      {
+        if (CDROM::HasMedia())
+        {
+          Host::AddOSDMessage(
+            fmt::format(TRANSLATE_FS("OSDMessage", "Failed to open CD image from save state '{}': {}.\nUsing "
+                                                   "existing image '{}', this may result in instability."),
+                        buffer.media_path, error ? error->GetDescription() : local_error.GetDescription(),
+                        Path::GetFileName(CDROM::GetMediaPath())),
+            Host::OSD_CRITICAL_ERROR_DURATION);
+        }
+        else
+        {
+          Error::AddPrefixFmt(error, TRANSLATE_FS("System", "Failed to open CD image '{}' used by save state:\n"),
+                              Path::GetFileName(buffer.media_path));
+          return false;
+        }
+      }
+      else if (g_settings.cdrom_load_image_to_ram)
+      {
+        CDROM::PrecacheMedia();
+      }
     }
   }
-
-  // Skip updating media if there is none, and none in the state. That way we don't wipe out EXE boot.
-  if (media)
-    UpdateRunningGame(media_path, media.get(), false);
-
-  CDROM::Reset();
-  if (media)
+  else
   {
-    const DiscRegion region = GameList::GetCustomRegionForPath(media_path).value_or(GetRegionForImage(media.get()));
-    CDROM::InsertMedia(std::move(media), region);
-    if (g_settings.cdrom_load_image_to_ram)
-      CDROM::PrecacheMedia();
+    // state has no disc
+    CDROM::RemoveMedia(false);
   }
 
   // ensure the correct card is loaded
@@ -3141,7 +3120,7 @@ bool System::SaveStateToBuffer(SaveStateBuffer* buffer, Error* error, u32 screen
 
   if (CDROM::HasMedia())
   {
-    buffer->media_path = CDROM::GetMediaFileName();
+    buffer->media_path = CDROM::GetMediaPath();
     buffer->media_subimage_index = CDROM::GetMedia()->HasSubImages() ? CDROM::GetMedia()->GetCurrentSubImage() : 0;
   }
 
@@ -4076,7 +4055,7 @@ std::string System::GetMediaFileName()
   if (!CDROM::HasMedia())
     return {};
 
-  return CDROM::GetMediaFileName();
+  return CDROM::GetMediaPath();
 }
 
 bool System::InsertMedia(const char* path)
@@ -4086,7 +4065,10 @@ bool System::InsertMedia(const char* path)
 
   Error error;
   std::unique_ptr<CDImage> image = CDImage::Open(path, g_settings.cdrom_load_image_patches, &error);
-  if (!image)
+  const DiscRegion region =
+    image ? GameList::GetCustomRegionForPath(path).value_or(GetRegionForImage(image.get())) : DiscRegion::NonPS1;
+  if (!image || (UpdateRunningGame(path, image.get(), false),
+                 !CDROM::InsertMedia(std::move(image), region, s_running_game_serial, s_running_game_title, &error)))
   {
     Host::AddIconOSDWarning(
       "DiscInserted", ICON_FA_COMPACT_DISC,
@@ -4095,9 +4077,6 @@ bool System::InsertMedia(const char* path)
     return false;
   }
 
-  const DiscRegion region = GameList::GetCustomRegionForPath(path).value_or(GetRegionForImage(image.get()));
-  UpdateRunningGame(path, image.get(), false);
-  CDROM::InsertMedia(std::move(image), region);
   INFO_LOG("Inserted media from {} ({}, {})", s_running_game_path, s_running_game_serial, s_running_game_title);
   if (g_settings.cdrom_load_image_to_ram)
     CDROM::PrecacheMedia();
@@ -4238,10 +4217,10 @@ void System::UpdateRunningGame(const std::string_view path, CDImage* image, bool
   Host::OnGameChanged(s_running_game_path, s_running_game_serial, s_running_game_title);
 }
 
-bool System::CheckForSBIFile(CDImage* image, Error* error)
+bool System::CheckForRequiredSubQ(Error* error)
 {
-  if (!s_running_game_entry || !s_running_game_entry->HasTrait(GameDatabase::Trait::IsLibCryptProtected) || !image ||
-      image->HasNonStandardSubchannel())
+  if (!s_running_game_entry || !s_running_game_entry->HasTrait(GameDatabase::Trait::IsLibCryptProtected) ||
+      CDROM::HasNonStandardOrReplacementSubQ())
   {
     return true;
   }
@@ -4328,25 +4307,36 @@ bool System::SwitchMediaSubImage(u32 index)
   Assert(image);
 
   Error error;
-  if (!image->SwitchSubImage(index, &error))
+  bool okay = image->SwitchSubImage(index, &error);
+  std::string title, subimage_title;
+  if (okay)
+  {
+    const DiscRegion region =
+      GameList::GetCustomRegionForPath(image->GetPath()).value_or(GetRegionForImage(image.get()));
+    subimage_title = image->GetSubImageMetadata(index, "title");
+    title = image->GetMetadata("title");
+    UpdateRunningGame(image->GetPath(), image.get(), false);
+    okay = CDROM::InsertMedia(std::move(image), region, s_running_game_serial, s_running_game_title, &error);
+  }
+  if (!okay)
   {
     Host::AddIconOSDMessage("MediaSwitchSubImage", ICON_FA_COMPACT_DISC,
                             fmt::format(TRANSLATE_FS("System", "Failed to switch to subimage {} in '{}': {}."),
-                                        index + 1u, Path::GetFileName(image->GetFileName()), error.GetDescription()),
+                                        index + 1u, Path::GetFileName(image->GetPath()), error.GetDescription()),
                             Host::OSD_INFO_DURATION);
 
-    const DiscRegion region = GetRegionForImage(image.get());
-    CDROM::InsertMedia(std::move(image), region);
+    // restore old disc
+    const DiscRegion region =
+      GameList::GetCustomRegionForPath(image->GetPath()).value_or(GetRegionForImage(image.get()));
+    UpdateRunningGame(image->GetPath(), image.get(), false);
+    CDROM::InsertMedia(std::move(image), region, s_running_game_serial, s_running_game_title, nullptr);
     return false;
   }
 
   Host::AddIconOSDMessage("MediaSwitchSubImage", ICON_FA_COMPACT_DISC,
-                          fmt::format(TRANSLATE_FS("System", "Switched to sub-image {} ({}) in '{}'."),
-                                      image->GetSubImageMetadata(index, "title"), index + 1u,
-                                      image->GetMetadata("title")),
+                          fmt::format(TRANSLATE_FS("System", "Switched to sub-image {} ({}) in '{}'."), subimage_title,
+                                      title, index + 1u, Path::GetFileName(CDROM::GetMediaPath())),
                           Host::OSD_INFO_DURATION);
-  const DiscRegion region = GetRegionForImage(image.get());
-  CDROM::InsertMedia(std::move(image), region);
 
   ClearMemorySaveStates();
   return true;
diff --git a/src/util/CMakeLists.txt b/src/util/CMakeLists.txt
index 6aa4f0e40..5ffe0b72f 100644
--- a/src/util/CMakeLists.txt
+++ b/src/util/CMakeLists.txt
@@ -15,8 +15,6 @@ add_library(util
   cd_image_mds.cpp
   cd_image_pbp.cpp
   cd_image_ppf.cpp
-  cd_subchannel_replacement.cpp
-  cd_subchannel_replacement.h
   compress_helpers.cpp
   compress_helpers.h
   cue_parser.cpp
diff --git a/src/util/cd_image.cpp b/src/util/cd_image.cpp
index 6e5d227c1..01adfe839 100644
--- a/src/util/cd_image.cpp
+++ b/src/util/cd_image.cpp
@@ -361,7 +361,7 @@ bool CDImage::ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_
   return true;
 }
 
-bool CDImage::HasNonStandardSubchannel() const
+bool CDImage::HasSubchannelData() const
 {
   return false;
 }
diff --git a/src/util/cd_image.h b/src/util/cd_image.h
index 9003ff121..a14850803 100644
--- a/src/util/cd_image.h
+++ b/src/util/cd_image.h
@@ -259,7 +259,7 @@ public:
                                                   ProgressCallback* progress = ProgressCallback::NullProgressCallback);
 
   // Accessors.
-  const std::string& GetFileName() const { return m_filename; }
+  const std::string& GetPath() const { return m_filename; }
   LBA GetPositionOnDisc() const { return m_position_on_disc; }
   Position GetMSFPositionOnDisc() const { return Position::FromLBA(m_position_on_disc); }
   LBA GetPositionInTrack() const { return m_position_in_track; }
@@ -311,7 +311,7 @@ public:
   virtual bool ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index);
 
   // Returns true if the image has replacement subchannel data.
-  virtual bool HasNonStandardSubchannel() const;
+  virtual bool HasSubchannelData() const;
 
   // Reads a single sector from an index.
   virtual bool ReadSectorFromIndex(void* buffer, const Index& index, LBA lba_in_index) = 0;
diff --git a/src/util/cd_image_bin.cpp b/src/util/cd_image_bin.cpp
index 3dbc4fa15..830664cf0 100644
--- a/src/util/cd_image_bin.cpp
+++ b/src/util/cd_image_bin.cpp
@@ -2,7 +2,6 @@
 // SPDX-License-Identifier: CC-BY-NC-ND-4.0
 
 #include "cd_image.h"
-#include "cd_subchannel_replacement.h"
 
 #include "common/error.h"
 #include "common/file_system.h"
@@ -18,9 +17,6 @@ public:
 
   bool Open(const char* filename, Error* error);
 
-  bool ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index) override;
-  bool HasNonStandardSubchannel() const override;
-
   s64 GetSizeOnDisk() const override;
 
 protected:
@@ -29,8 +25,6 @@ protected:
 private:
   std::FILE* m_fp = nullptr;
   u64 m_file_position = 0;
-
-  CDSubChannelReplacement m_sbi;
 };
 
 } // namespace
@@ -102,24 +96,9 @@ bool CDImageBin::Open(const char* filename, Error* error)
 
   AddLeadOutIndex();
 
-  m_sbi.LoadFromImagePath(filename);
-
   return Seek(1, Position{0, 0, 0});
 }
 
-bool CDImageBin::ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index)
-{
-  if (m_sbi.GetReplacementSubChannelQ(index.start_lba_on_disc + lba_in_index, subq))
-    return true;
-
-  return CDImage::ReadSubChannelQ(subq, index, lba_in_index);
-}
-
-bool CDImageBin::HasNonStandardSubchannel() const
-{
-  return (m_sbi.GetReplacementSectorCount() > 0);
-}
-
 bool CDImageBin::ReadSectorFromIndex(void* buffer, const Index& index, LBA lba_in_index)
 {
   const u64 file_position = index.file_offset + (static_cast<u64>(lba_in_index) * index.file_sector_size);
diff --git a/src/util/cd_image_chd.cpp b/src/util/cd_image_chd.cpp
index 0229cc0a8..a315be7e1 100644
--- a/src/util/cd_image_chd.cpp
+++ b/src/util/cd_image_chd.cpp
@@ -2,7 +2,6 @@
 // SPDX-License-Identifier: CC-BY-NC-ND-4.0
 
 #include "cd_image.h"
-#include "cd_subchannel_replacement.h"
 
 #include "common/align.h"
 #include "common/assert.h"
@@ -65,7 +64,7 @@ public:
   bool Open(const char* filename, Error* error);
 
   bool ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index) override;
-  bool HasNonStandardSubchannel() const override;
+  bool HasSubchannelData() const override;
   PrecacheResult Precache(ProgressCallback* progress) override;
   bool IsPrecached() const override;
   s64 GetSizeOnDisk() const override;
@@ -90,8 +89,6 @@ private:
   DynamicHeapArray<u8, 16> m_hunk_buffer;
   u32 m_current_hunk_index = static_cast<u32>(-1);
   bool m_precached = false;
-
-  CDSubChannelReplacement m_sbi;
 };
 } // namespace
 
@@ -415,16 +412,11 @@ bool CDImageCHD::Open(const char* filename, Error* error)
   m_lba_count = disc_lba;
   AddLeadOutIndex();
 
-  m_sbi.LoadFromImagePath(filename);
-
   return Seek(1, Position{0, 0, 0});
 }
 
 bool CDImageCHD::ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index)
 {
-  if (m_sbi.GetReplacementSubChannelQ(index.start_lba_on_disc + lba_in_index, subq))
-    return true;
-
   if (index.submode == CDImage::SubchannelMode::None)
     return CDImage::ReadSubChannelQ(subq, index, lba_in_index);
 
@@ -446,10 +438,10 @@ bool CDImageCHD::ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_
   return true;
 }
 
-bool CDImageCHD::HasNonStandardSubchannel() const
+bool CDImageCHD::HasSubchannelData() const
 {
   // Just look at the first track for in-CHD subq.
-  return (m_sbi.GetReplacementSectorCount() > 0 || m_tracks.front().submode != CDImage::SubchannelMode::None);
+  return (m_tracks.front().submode != CDImage::SubchannelMode::None);
 }
 
 CDImage::PrecacheResult CDImageCHD::Precache(ProgressCallback* progress)
diff --git a/src/util/cd_image_cue.cpp b/src/util/cd_image_cue.cpp
index ad12da262..6b1406632 100644
--- a/src/util/cd_image_cue.cpp
+++ b/src/util/cd_image_cue.cpp
@@ -2,7 +2,6 @@
 // SPDX-License-Identifier: CC-BY-NC-ND-4.0
 
 #include "cd_image.h"
-#include "cd_subchannel_replacement.h"
 #include "cue_parser.h"
 
 #include "common/assert.h"
@@ -29,8 +28,6 @@ public:
 
   bool OpenAndParse(const char* filename, Error* error);
 
-  bool ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index) override;
-  bool HasNonStandardSubchannel() const override;
   s64 GetSizeOnDisk() const override;
 
 protected:
@@ -45,7 +42,6 @@ private:
   };
 
   std::vector<TrackFile> m_files;
-  CDSubChannelReplacement m_sbi;
 };
 
 } // namespace
@@ -293,24 +289,9 @@ bool CDImageCueSheet::OpenAndParse(const char* filename, Error* error)
   m_lba_count = disc_lba;
   AddLeadOutIndex();
 
-  m_sbi.LoadFromImagePath(filename);
-
   return Seek(1, Position{0, 0, 0});
 }
 
-bool CDImageCueSheet::ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index)
-{
-  if (m_sbi.GetReplacementSubChannelQ(index.start_lba_on_disc + lba_in_index, subq))
-    return true;
-
-  return CDImage::ReadSubChannelQ(subq, index, lba_in_index);
-}
-
-bool CDImageCueSheet::HasNonStandardSubchannel() const
-{
-  return (m_sbi.GetReplacementSectorCount() > 0);
-}
-
 bool CDImageCueSheet::ReadSectorFromIndex(void* buffer, const Index& index, LBA lba_in_index)
 {
   DebugAssert(index.file_index < m_files.size());
diff --git a/src/util/cd_image_device.cpp b/src/util/cd_image_device.cpp
index c16ce060e..082a8aeb2 100644
--- a/src/util/cd_image_device.cpp
+++ b/src/util/cd_image_device.cpp
@@ -213,7 +213,7 @@ public:
   bool Open(const char* filename, Error* error);
 
   bool ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index) override;
-  bool HasNonStandardSubchannel() const override;
+  bool HasSubchannelData() const override;
 
 protected:
   bool ReadSectorFromIndex(void* buffer, const Index& index, LBA lba_in_index) override;
@@ -441,7 +441,7 @@ bool CDImageDeviceWin32::ReadSubChannelQ(SubChannelQ* subq, const Index& index,
   }
 }
 
-bool CDImageDeviceWin32::HasNonStandardSubchannel() const
+bool CDImageDeviceWin32::HasSubchannelData() const
 {
   return m_has_valid_subcode;
 }
@@ -704,7 +704,7 @@ public:
   bool Open(const char* filename, Error* error);
 
   bool ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index) override;
-  bool HasNonStandardSubchannel() const override;
+  bool HasSubchannelData() const override;
 
 protected:
   bool ReadSectorFromIndex(void* buffer, const Index& index, LBA lba_in_index) override;
@@ -932,7 +932,7 @@ bool CDImageDeviceLinux::ReadSubChannelQ(SubChannelQ* subq, const Index& index,
   }
 }
 
-bool CDImageDeviceLinux::HasNonStandardSubchannel() const
+bool CDImageDeviceLinux::HasSubchannelData() const
 {
   // Can only read subchannel through SPTD.
   return m_scsi_read_mode >= SCSIReadMode::Full;
@@ -1165,7 +1165,7 @@ public:
   bool Open(const char* filename, Error* error);
 
   bool ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index) override;
-  bool HasNonStandardSubchannel() const override;
+  bool HasSubchannelData() const override;
 
 protected:
   bool ReadSectorFromIndex(void* buffer, const Index& index, LBA lba_in_index) override;
@@ -1440,7 +1440,7 @@ bool CDImageDeviceMacOS::ReadSubChannelQ(SubChannelQ* subq, const Index& index,
   }
 }
 
-bool CDImageDeviceMacOS::HasNonStandardSubchannel() const
+bool CDImageDeviceMacOS::HasSubchannelData() const
 {
   // Can only read subchannel through SPTD.
   return m_read_mode >= SCSIReadMode::Full;
diff --git a/src/util/cd_image_ecm.cpp b/src/util/cd_image_ecm.cpp
index c4f8c8480..9c680f435 100644
--- a/src/util/cd_image_ecm.cpp
+++ b/src/util/cd_image_ecm.cpp
@@ -2,7 +2,6 @@
 // SPDX-License-Identifier: CC-BY-NC-ND-4.0
 
 #include "cd_image.h"
-#include "cd_subchannel_replacement.h"
 
 #include "common/assert.h"
 #include "common/error.h"
@@ -27,8 +26,6 @@ public:
 
   bool Open(const char* filename, Error* error);
 
-  bool ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index) override;
-  bool HasNonStandardSubchannel() const override;
   s64 GetSizeOnDisk() const override;
 
 protected:
@@ -74,8 +71,6 @@ private:
   DataMap m_data_map;
   std::vector<u8> m_chunk_buffer;
   u32 m_chunk_start = 0;
-
-  CDSubChannelReplacement m_sbi;
 };
 
 } // namespace
@@ -260,8 +255,6 @@ bool CDImageEcm::Open(const char* filename, Error* error)
 
   AddLeadOutIndex();
 
-  m_sbi.LoadFromImagePath(filename);
-
   m_chunk_buffer.reserve(RAW_SECTOR_SIZE * 2);
   return Seek(1, Position{0, 0, 0});
 }
@@ -369,19 +362,6 @@ bool CDImageEcm::ReadChunks(u32 disc_offset, u32 size)
   return true;
 }
 
-bool CDImageEcm::ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index)
-{
-  if (m_sbi.GetReplacementSubChannelQ(index.start_lba_on_disc + lba_in_index, subq))
-    return true;
-
-  return CDImage::ReadSubChannelQ(subq, index, lba_in_index);
-}
-
-bool CDImageEcm::HasNonStandardSubchannel() const
-{
-  return (m_sbi.GetReplacementSectorCount() > 0);
-}
-
 bool CDImageEcm::ReadSectorFromIndex(void* buffer, const Index& index, LBA lba_in_index)
 {
   const u32 file_start = static_cast<u32>(index.file_offset) + (lba_in_index * index.file_sector_size);
diff --git a/src/util/cd_image_m3u.cpp b/src/util/cd_image_m3u.cpp
index 12f79219d..42e84aea7 100644
--- a/src/util/cd_image_m3u.cpp
+++ b/src/util/cd_image_m3u.cpp
@@ -2,7 +2,6 @@
 // SPDX-License-Identifier: CC-BY-NC-ND-4.0
 
 #include "cd_image.h"
-#include "cd_subchannel_replacement.h"
 
 #include "common/assert.h"
 #include "common/error.h"
@@ -28,7 +27,7 @@ public:
   bool Open(const char* path, bool apply_patches, Error* Error);
 
   bool ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index) override;
-  bool HasNonStandardSubchannel() const override;
+  bool HasSubchannelData() const override;
 
   bool HasSubImages() const override;
   u32 GetSubImageCount() const override;
@@ -115,9 +114,9 @@ bool CDImageM3u::Open(const char* path, bool apply_patches, Error* error)
   return !m_entries.empty() && SwitchSubImage(0, error);
 }
 
-bool CDImageM3u::HasNonStandardSubchannel() const
+bool CDImageM3u::HasSubchannelData() const
 {
-  return m_current_image->HasNonStandardSubchannel();
+  return m_current_image->HasSubchannelData();
 }
 
 bool CDImageM3u::HasSubImages() const
diff --git a/src/util/cd_image_mds.cpp b/src/util/cd_image_mds.cpp
index 34d4d9367..5dd98e14f 100644
--- a/src/util/cd_image_mds.cpp
+++ b/src/util/cd_image_mds.cpp
@@ -3,7 +3,6 @@
 
 #include "assert.h"
 #include "cd_image.h"
-#include "cd_subchannel_replacement.h"
 
 #include "common/error.h"
 #include "common/file_system.h"
@@ -46,8 +45,6 @@ public:
 
   bool OpenAndParse(const char* filename, Error* error);
 
-  bool ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index) override;
-  bool HasNonStandardSubchannel() const override;
   s64 GetSizeOnDisk() const override;
 
 protected:
@@ -56,7 +53,6 @@ protected:
 private:
   std::FILE* m_mdf_file = nullptr;
   u64 m_mdf_file_position = 0;
-  CDSubChannelReplacement m_sbi;
 };
 
 } // namespace
@@ -243,24 +239,9 @@ bool CDImageMds::OpenAndParse(const char* filename, Error* error)
   m_lba_count = m_tracks.back().start_lba + m_tracks.back().length;
   AddLeadOutIndex();
 
-  m_sbi.LoadFromImagePath(filename);
-
   return Seek(1, Position{0, 0, 0});
 }
 
-bool CDImageMds::ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index)
-{
-  if (m_sbi.GetReplacementSubChannelQ(index.start_lba_on_disc + lba_in_index, subq))
-    return true;
-
-  return CDImage::ReadSubChannelQ(subq, index, lba_in_index);
-}
-
-bool CDImageMds::HasNonStandardSubchannel() const
-{
-  return (m_sbi.GetReplacementSectorCount() > 0);
-}
-
 bool CDImageMds::ReadSectorFromIndex(void* buffer, const Index& index, LBA lba_in_index)
 {
   const u64 file_position = index.file_offset + (static_cast<u64>(lba_in_index) * index.file_sector_size);
diff --git a/src/util/cd_image_memory.cpp b/src/util/cd_image_memory.cpp
index 847e446b5..7904909b5 100644
--- a/src/util/cd_image_memory.cpp
+++ b/src/util/cd_image_memory.cpp
@@ -2,7 +2,6 @@
 // SPDX-License-Identifier: CC-BY-NC-ND-4.0
 
 #include "cd_image.h"
-#include "cd_subchannel_replacement.h"
 
 #include "common/assert.h"
 #include "common/file_system.h"
@@ -24,9 +23,6 @@ public:
 
   bool CopyImage(CDImage* image, ProgressCallback* progress);
 
-  bool ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index) override;
-  bool HasNonStandardSubchannel() const override;
-
   bool IsPrecached() const override;
 
 protected:
@@ -35,7 +31,6 @@ protected:
 private:
   u8* m_memory = nullptr;
   u32 m_memory_sectors = 0;
-  CDSubChannelReplacement m_sbi;
 };
 
 } // namespace
@@ -119,27 +114,12 @@ bool CDImageMemory::CopyImage(CDImage* image, ProgressCallback* progress)
   }
 
   Assert(current_offset == m_memory_sectors);
-  m_filename = image->GetFileName();
+  m_filename = image->GetPath();
   m_lba_count = image->GetLBACount();
 
-  m_sbi.LoadFromImagePath(m_filename);
-
   return Seek(1, Position{0, 0, 0});
 }
 
-bool CDImageMemory::ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index)
-{
-  if (m_sbi.GetReplacementSubChannelQ(index.start_lba_on_disc + lba_in_index, subq))
-    return true;
-
-  return CDImage::ReadSubChannelQ(subq, index, lba_in_index);
-}
-
-bool CDImageMemory::HasNonStandardSubchannel() const
-{
-  return (m_sbi.GetReplacementSectorCount() > 0);
-}
-
 bool CDImageMemory::IsPrecached() const
 {
   return true;
diff --git a/src/util/cd_image_pbp.cpp b/src/util/cd_image_pbp.cpp
index 7220ee6b5..7335299b3 100644
--- a/src/util/cd_image_pbp.cpp
+++ b/src/util/cd_image_pbp.cpp
@@ -2,7 +2,6 @@
 // SPDX-License-Identifier: CC-BY-NC-ND-4.0
 
 #include "cd_image.h"
-#include "cd_subchannel_replacement.h"
 
 #include "common/assert.h"
 #include "common/error.h"
@@ -134,8 +133,6 @@ public:
 
   bool Open(const char* filename, Error* error);
 
-  bool ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index) override;
-  bool HasNonStandardSubchannel() const override;
   s64 GetSizeOnDisk() const override;
 
   bool HasSubImages() const override;
@@ -197,8 +194,6 @@ private:
   std::vector<u8> m_compressed_block;
 
   z_stream m_inflate_stream;
-
-  CDSubChannelReplacement m_sbi;
 };
 } // namespace
 
@@ -738,20 +733,6 @@ bool CDImagePBP::OpenDisc(u32 index, Error* error)
     return false;
   }
 
-  if (m_disc_offsets.size() > 1)
-  {
-    // Gross. Have to use the SBI suffix here, otherwise Android won't resolve content URIs...
-    // Which means that LSD won't be usable with PBP on Android. Oh well.
-    const std::string display_name = FileSystem::GetDisplayNameFromPath(m_filename);
-    const std::string offset_path =
-      Path::BuildRelativePath(m_filename, fmt::format("{}_{}.sbi", Path::StripExtension(display_name), index + 1));
-    m_sbi.LoadFromImagePath(offset_path);
-  }
-  else
-  {
-    m_sbi.LoadFromImagePath(m_filename);
-  }
-
   m_current_disc = index;
   return Seek(1, Position{0, 0, 0});
 }
@@ -817,19 +798,6 @@ bool CDImagePBP::DecompressBlock(const BlockInfo& block_info)
   return true;
 }
 
-bool CDImagePBP::ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index)
-{
-  if (m_sbi.GetReplacementSubChannelQ(index.start_lba_on_disc + lba_in_index, subq))
-    return true;
-
-  return CDImage::ReadSubChannelQ(subq, index, lba_in_index);
-}
-
-bool CDImagePBP::HasNonStandardSubchannel() const
-{
-  return (m_sbi.GetReplacementSectorCount() > 0);
-}
-
 bool CDImagePBP::ReadSectorFromIndex(void* buffer, const Index& index, LBA lba_in_index)
 {
   const u32 offset_in_file = static_cast<u32>(index.file_offset) + (lba_in_index * index.file_sector_size);
diff --git a/src/util/cd_image_ppf.cpp b/src/util/cd_image_ppf.cpp
index 22ea204da..8f59721e5 100644
--- a/src/util/cd_image_ppf.cpp
+++ b/src/util/cd_image_ppf.cpp
@@ -2,7 +2,6 @@
 // SPDX-License-Identifier: CC-BY-NC-ND-4.0
 
 #include "cd_image.h"
-#include "cd_subchannel_replacement.h"
 
 #include "common/assert.h"
 #include "common/file_system.h"
@@ -33,7 +32,7 @@ public:
   bool Open(const char* filename, std::unique_ptr<CDImage> parent_image);
 
   bool ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_in_index) override;
-  bool HasNonStandardSubchannel() const override;
+  bool HasSubchannelData() const override;
   s64 GetSizeOnDisk() const override;
 
   std::string GetMetadata(std::string_view type) const override;
@@ -89,7 +88,7 @@ bool CDImagePPF::Open(const char* filename, std::unique_ptr<CDImage> parent_imag
     m_replacement_offset = parent_image->GetIndex(1).start_lba_on_disc;
 
   // copy all the stuff from the parent image
-  m_filename = parent_image->GetFileName();
+  m_filename = parent_image->GetPath();
   m_tracks = parent_image->GetTracks();
   m_indices = parent_image->GetIndices();
   m_parent_image = std::move(parent_image);
@@ -416,9 +415,9 @@ bool CDImagePPF::ReadSubChannelQ(SubChannelQ* subq, const Index& index, LBA lba_
   return m_parent_image->ReadSubChannelQ(subq, index, lba_in_index);
 }
 
-bool CDImagePPF::HasNonStandardSubchannel() const
+bool CDImagePPF::HasSubchannelData() const
 {
-  return m_parent_image->HasNonStandardSubchannel();
+  return m_parent_image->HasSubchannelData();
 }
 
 std::string CDImagePPF::GetMetadata(std::string_view type) const
diff --git a/src/util/cd_subchannel_replacement.cpp b/src/util/cd_subchannel_replacement.cpp
deleted file mode 100644
index c24fabfaa..000000000
--- a/src/util/cd_subchannel_replacement.cpp
+++ /dev/null
@@ -1,167 +0,0 @@
-// SPDX-FileCopyrightText: 2019-2024 Connor McLaughlin <stenzek@gmail.com>
-// SPDX-License-Identifier: CC-BY-NC-ND-4.0
-
-#include "cd_subchannel_replacement.h"
-#include "common/file_system.h"
-#include "common/log.h"
-#include "common/path.h"
-#include <algorithm>
-#include <memory>
-LOG_CHANNEL(CDSubChannelReplacement);
-
-#pragma pack(push, 1)
-struct SBIFileEntry
-{
-  u8 minute_bcd;
-  u8 second_bcd;
-  u8 frame_bcd;
-  u8 type;
-  u8 data[10];
-};
-struct LSDFileEntry
-{
-  u8 minute_bcd;
-  u8 second_bcd;
-  u8 frame_bcd;
-  u8 data[12];
-};
-static_assert(sizeof(LSDFileEntry) == 15);
-#pragma pack(pop)
-
-CDSubChannelReplacement::CDSubChannelReplacement() = default;
-
-CDSubChannelReplacement::~CDSubChannelReplacement() = default;
-
-static constexpr u32 MSFToLBA(u8 minute_bcd, u8 second_bcd, u8 frame_bcd)
-{
-  const u8 minute = PackedBCDToBinary(minute_bcd);
-  const u8 second = PackedBCDToBinary(second_bcd);
-  const u8 frame = PackedBCDToBinary(frame_bcd);
-
-  return (ZeroExtend32(minute) * 60 * 75) + (ZeroExtend32(second) * 75) + ZeroExtend32(frame);
-}
-
-bool CDSubChannelReplacement::LoadSBI(const std::string& path)
-{
-  auto fp = FileSystem::OpenManagedCFile(path.c_str(), "rb");
-  if (!fp)
-    return false;
-
-  char header[4];
-  if (std::fread(header, sizeof(header), 1, fp.get()) != 1)
-  {
-    ERROR_LOG("Failed to read header for '{}'", path);
-    return true;
-  }
-
-  static constexpr char expected_header[] = {'S', 'B', 'I', '\0'};
-  if (std::memcmp(header, expected_header, sizeof(header)) != 0)
-  {
-    ERROR_LOG("Invalid header in '{}'", path);
-    return true;
-  }
-
-  m_replacement_subq.clear();
-
-  SBIFileEntry entry;
-  while (std::fread(&entry, sizeof(entry), 1, fp.get()) == 1)
-  {
-    if (!IsValidPackedBCD(entry.minute_bcd) || !IsValidPackedBCD(entry.second_bcd) ||
-        !IsValidPackedBCD(entry.frame_bcd))
-    {
-      ERROR_LOG("Invalid position [{:02x}:{:02x}:{:02x}] in '{}'", entry.minute_bcd, entry.second_bcd, entry.frame_bcd,
-                path);
-      return false;
-    }
-
-    if (entry.type != 1)
-    {
-      ERROR_LOG("Invalid type 0x{:02X} in '{}'", entry.type, path);
-      return false;
-    }
-
-    const u32 lba = MSFToLBA(entry.minute_bcd, entry.second_bcd, entry.frame_bcd);
-
-    CDImage::SubChannelQ subq;
-    std::memcpy(subq.data.data(), entry.data, sizeof(entry.data));
-
-    // generate an invalid crc by flipping all bits from the valid crc (will never collide)
-    const u16 crc = subq.ComputeCRC(subq.data) ^ 0xFFFF;
-    subq.data[10] = Truncate8(crc);
-    subq.data[11] = Truncate8(crc >> 8);
-
-    m_replacement_subq.emplace(lba, subq);
-  }
-
-  INFO_LOG("Loaded {} replacement sectors from SBI '{}'", m_replacement_subq.size(), path);
-  return true;
-}
-
-bool CDSubChannelReplacement::LoadLSD(const std::string& path)
-{
-  auto fp = FileSystem::OpenManagedCFile(path.c_str(), "rb");
-  if (!fp)
-    return false;
-
-  m_replacement_subq.clear();
-
-  LSDFileEntry entry;
-  while (std::fread(&entry, sizeof(entry), 1, fp.get()) == 1)
-  {
-    if (!IsValidPackedBCD(entry.minute_bcd) || !IsValidPackedBCD(entry.second_bcd) ||
-        !IsValidPackedBCD(entry.frame_bcd))
-    {
-      ERROR_LOG("Invalid position [{:02x}:{:02x}:{:02x}] in '{}'", entry.minute_bcd, entry.second_bcd, entry.frame_bcd,
-                path);
-      return false;
-    }
-
-    const u32 lba = MSFToLBA(entry.minute_bcd, entry.second_bcd, entry.frame_bcd);
-
-    CDImage::SubChannelQ subq;
-    std::memcpy(subq.data.data(), entry.data, sizeof(entry.data));
-
-    DEBUG_LOG("{:02x}:{:02x}:{:02x}: CRC {}", entry.minute_bcd, entry.second_bcd, entry.frame_bcd,
-              subq.IsCRCValid() ? "VALID" : "INVALID");
-    m_replacement_subq.emplace(lba, subq);
-  }
-
-  INFO_LOG("Loaded {} replacement sectors from LSD '{}'", m_replacement_subq.size(), path);
-  return true;
-}
-
-bool CDSubChannelReplacement::LoadFromImagePath(std::string_view image_path)
-{
-  if (const std::string filename = Path::ReplaceExtension(image_path, "sbi"); LoadSBI(filename.c_str()))
-    return true;
-
-  if (const std::string filename = Path::ReplaceExtension(image_path, "lsd"); LoadLSD(filename.c_str()))
-    return true;
-
-  return false;
-}
-
-void CDSubChannelReplacement::AddReplacementSubChannelQ(u32 lba, const CDImage::SubChannelQ& subq)
-{
-  auto iter = m_replacement_subq.find(lba);
-  if (iter != m_replacement_subq.end())
-    iter->second.data = subq.data;
-  else
-    m_replacement_subq.emplace(lba, subq);
-}
-
-bool CDSubChannelReplacement::GetReplacementSubChannelQ(u8 minute_bcd, u8 second_bcd, u8 frame_bcd,
-                                                        CDImage::SubChannelQ* subq) const
-{
-  return GetReplacementSubChannelQ(MSFToLBA(minute_bcd, second_bcd, frame_bcd), subq);
-}
-
-bool CDSubChannelReplacement::GetReplacementSubChannelQ(u32 lba, CDImage::SubChannelQ* subq) const
-{
-  const auto iter = m_replacement_subq.find(lba);
-  if (iter == m_replacement_subq.cend())
-    return false;
-
-  *subq = iter->second;
-  return true;
-}
diff --git a/src/util/cd_subchannel_replacement.h b/src/util/cd_subchannel_replacement.h
deleted file mode 100644
index 791a4334c..000000000
--- a/src/util/cd_subchannel_replacement.h
+++ /dev/null
@@ -1,37 +0,0 @@
-// SPDX-FileCopyrightText: 2019-2024 Connor McLaughlin <stenzek@gmail.com>
-// SPDX-License-Identifier: CC-BY-NC-ND-4.0
-
-#pragma once
-#include "cd_image.h"
-#include "common/types.h"
-#include <array>
-#include <cstdio>
-#include <unordered_map>
-
-class CDSubChannelReplacement
-{
-public:
-  CDSubChannelReplacement();
-  ~CDSubChannelReplacement();
-
-  u32 GetReplacementSectorCount() const { return static_cast<u32>(m_replacement_subq.size()); }
-
-  bool LoadFromImagePath(std::string_view image_path);
-
-  /// Adds a sector to the replacement map.
-  void AddReplacementSubChannelQ(u32 lba, const CDImage::SubChannelQ& subq);
-
-  /// Returns the replacement subchannel data for the specified position (in BCD).
-  bool GetReplacementSubChannelQ(u8 minute_bcd, u8 second_bcd, u8 frame_bcd, CDImage::SubChannelQ* subq) const;
-
-  /// Returns the replacement subchannel data for the specified sector.
-  bool GetReplacementSubChannelQ(u32 lba, CDImage::SubChannelQ* subq) const;
-
-private:
-  using ReplacementMap = std::unordered_map<u32, CDImage::SubChannelQ>;
-
-  bool LoadSBI(const std::string& path);
-  bool LoadLSD(const std::string& path);
-
-  ReplacementMap m_replacement_subq;
-};
diff --git a/src/util/util.vcxproj b/src/util/util.vcxproj
index ad910df6c..66c9c7964 100644
--- a/src/util/util.vcxproj
+++ b/src/util/util.vcxproj
@@ -78,7 +78,6 @@
       <ExcludedFromBuild Condition="'$(Platform)'=='ARM64'">true</ExcludedFromBuild>
     </ClInclude>
     <ClInclude Include="page_fault_handler.h" />
-    <ClInclude Include="cd_subchannel_replacement.h" />
     <ClInclude Include="pch.h" />
     <ClInclude Include="platform_misc.h" />
     <ClInclude Include="postprocessing.h" />
@@ -148,7 +147,6 @@
     <ClCompile Include="input_manager.cpp" />
     <ClCompile Include="input_source.cpp" />
     <ClCompile Include="iso_reader.cpp" />
-    <ClCompile Include="cd_subchannel_replacement.cpp" />
     <ClCompile Include="media_capture.cpp" />
     <ClCompile Include="opengl_context.cpp">
       <ExcludedFromBuild Condition="'$(Platform)'=='ARM64'">true</ExcludedFromBuild>
diff --git a/src/util/util.vcxproj.filters b/src/util/util.vcxproj.filters
index 48eb3ef1e..fd5e6bb63 100644
--- a/src/util/util.vcxproj.filters
+++ b/src/util/util.vcxproj.filters
@@ -5,7 +5,6 @@
     <ClInclude Include="audio_stream.h" />
     <ClInclude Include="iso_reader.h" />
     <ClInclude Include="cd_image.h" />
-    <ClInclude Include="cd_subchannel_replacement.h" />
     <ClInclude Include="wav_writer.h" />
     <ClInclude Include="cd_image_hasher.h" />
     <ClInclude Include="shiftjis.h" />
@@ -81,7 +80,6 @@
     <ClCompile Include="cd_image_cue.cpp" />
     <ClCompile Include="cd_image_bin.cpp" />
     <ClCompile Include="iso_reader.cpp" />
-    <ClCompile Include="cd_subchannel_replacement.cpp" />
     <ClCompile Include="cd_image_chd.cpp" />
     <ClCompile Include="wav_writer.cpp" />
     <ClCompile Include="cd_image_hasher.cpp" />