NAME

       f3write, f3read - test real flash memory capacity

SYNOPSIS

       f3write [--start-at=NUM] [--end-at=NUM] <PATH>
       f3read  [--start-at=NUM] [--end-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.h2w,
       where N is a number (i.e. /[0-9]+/).

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

OPTIONS

       --start-at=NUM
              Initial number of file names. Default value is 1.

       --end-at=NUM
              Final number of file names. Default value is "infinity".

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 Michel Machado <michel@digirati.com.br>.  This  manual  page  was  first
       written by Joao Eriberto Mota Filho <eriberto@eriberto.pro.br>.