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

SEE ALSO

       For detailed information about the F3 tools, see:

       http://oss.digirati.com.br/f3/

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>.

F3 8.0                                            October 2020                                             F3(1)