Guide_3DS/_pages/F3-(Linux).md

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---
title: "F3 (Linux)"
permalink: /f3-(linux).html
---
This page will walk you through the process of 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 [F3X (mac)](f3x-(mac)) pages.
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#### What you need
* The latest version of [F3](https://github.com/AltraMayor/f3/archive/v6.0.zip)
#### Instructions
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1. Unzip the f3 `.zip` file
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2. `cd` into the f3 directory
3. Run `make` to compile F3
4. Insert your SD card into your computer
5. Mount your SD card
6. Run `./f3write <your sd card mount point>`
7. Wait until the process is complete. See below for an example output.
$ ./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
8. Run `./f3read <your sd card mount point>`
9. Wait until the process is complete. See below for an example output.
$ ./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
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 the SD card
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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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Return to [Get Started](get-started)
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