F3(1)

NAME
f3write, f3read - test real flash memory capacity

SYNOPSIS
f3write [--start-at=NUM] <PATH>
f3read  [--start-at=NUM] <PATH>

DESCRIPTION
F3 (Fight Flash Fraud or Fight Fake Flash) tests the full capacity of a flash card (flash drive, flash disk, pendrive). It writes to the card and then checks if can read it. It will assure you haven't been sold a card with a smaller capacity than stated.

When writing to flash drive, f3write fills the filesystem with 1GB files named N.fff, where N is a number (i.e. /[0-9]+/).

WARNING: all data on the tested disk will be lost!!!

OPTIONS

--start-at=NUM
    Initial number to files names. Default value is 1.

EXAMPLE
To write over a flash drive mounted at /media/TEST:

      $ f3write /media/TEST
To read this flash drive:

      $ f3read /media/TEST

AUTHOR
f3 was written by Digirati <michael@digirati.com.br>. This manual page was written by Joao Eriberto Mota Filho <eriberto@eriberto.pro.br> for the Debian project (but may be used by others).