F3 (Linux)

This page will walk you through the process of checking your SD card for errors using F3.

Depending on the size of your SD card and the speed of your computer, this process can take up to several hours!

This page is for Linux users only. If you are not on Linux, check out the H2testw (windows) or F3X (mac) pages.

What you need

  • The latest version of F3


  1. Unzip the f3 .zip file
  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 your SD card

If the test shows any other results, your SD card may be corrupted or damaged and you may have to replace it!

Return to Get Started

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