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# F3 (Linux)
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## Required Reading
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This is an add-on section for checking your SD card for errors using F3.
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Depending on the size of your SD card and the speed of your computer, this process can take up to several hours!
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This page is for Linux users only. If you are not on Linux, check out the [H2testw (Windows) ](h2testw-(windows )) or [F3XSwift (Mac) ](f3xswift-(mac )) pages.
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## What You Need
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* The latest version of [F3 ](https://github.com/AltraMayor/f3/releases/tag/v8.0 )
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## Instructions
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1. Unzip the f3 `.zip` file
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1. `cd` into the f3 directory
1. Run `make` to compile F3
1. Insert your SD card into your computer
1. Mount your SD card
1. Run `./f3write <your sd card mount point>`
1. Wait until the process is complete. See below for an example output.
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~~~ bash
$ ./f3write /media/michel/6135-3363/
Free space: 29.71 GB
Creating file 1.h2w ... OK!
...
Creating file 30.h2w ... OK!
Free space: 0.00 Byte
Average Writing speed: 4.90 MB/s
~~~
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1. Run `./f3read <your sd card mount point>`
1. Wait until the process is complete. See below for an example output.
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~~~ bash
$ ./f3read /media/michel/6135-3363/
SECTORS ok/corrupted/changed/overwritten
Validating file 1.h2w ... 2097152/ 0/ 0/ 0
...
Validating file 30.h2w ... 1491904/ 0/ 0/ 0
Data OK: 29.71 GB (62309312 sectors)
Data LOST: 0.00 Byte (0 sectors)
Corrupted: 0.00 Byte (0 sectors)
Slightly changed: 0.00 Byte (0 sectors)
Overwritten: 0.00 Byte (0 sectors)
Average Reading speed: 9.42 MB/s
~~~
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___
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::: tip
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If the test shows the result `Data LOST: 0.00 Byte (0 sectors)` , your SD card is good and you can delete all `.h2w` files on your SD card.
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:::
::: danger
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If the test shows any other results, your SD card may be corrupted or damaged and you may have to replace it!
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:::
::: tip
Return to [Get Started ](get-started )
:::