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F3(1) test real flash memory capacity F3(1)

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

Initial number of file names. Default value is 1.
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>.

October 2020 F3 8.0