2019-04-29 00:49:08 +02:00
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---
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title: "F3 (Linux)"
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---
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{% include toc title="Table of Contents" %}
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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 [F3X (mac)](f3x-(mac)) pages.
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### What You Need
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* The latest version of [F3](https://github.com/AltraMayor/f3/releases/latest)
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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
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1. Run `make` to compile F3
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1. Insert your SD card into your computer
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1. Mount your SD card
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1. Run `./f3write <your sd card mount point>`
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1. Wait until the process is complete. See below for an example output.
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~~~ bash
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$ ./f3write /media/michel/6135-3363/
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Free space: 29.71 GB
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Creating file 1.h2w ... OK!
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...
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Creating file 30.h2w ... OK!
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Free space: 0.00 Byte
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Average Writing speed: 4.90 MB/s
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~~~
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1. Run `./f3read <your sd card mount point>`
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1. Wait until the process is complete. See below for an example output.
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~~~ bash
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$ ./f3read /media/michel/6135-3363/
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SECTORS ok/corrupted/changed/overwritten
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Validating file 1.h2w ... 2097152/ 0/ 0/ 0
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...
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Validating file 30.h2w ... 1491904/ 0/ 0/ 0
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Data OK: 29.71 GB (62309312 sectors)
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Data LOST: 0.00 Byte (0 sectors)
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Corrupted: 0.00 Byte (0 sectors)
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Slightly changed: 0.00 Byte (0 sectors)
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Overwritten: 0.00 Byte (0 sectors)
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Average Reading speed: 9.42 MB/s
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~~~
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___
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2021-04-20 23:26:34 +02:00
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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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2019-04-29 00:49:08 +02:00
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{: .notice--success}
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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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{: .notice--danger}
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### Return to [Get Started](get-started)
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{: .notice--primary}
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