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

6       f3write, f3read - test real flash memory capacity
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SYNOPSIS

9       f3write [--start-at=NUM] [--end-at=NUM] <PATH>
10       f3read  [--start-at=NUM] [--end-at=NUM] <PATH>
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DESCRIPTION

13       F3 (Fight Flash Fraud or Fight Fake Flash) tests the full capacity of a
14       flash card (flash drive, flash disk, pendrive). It writes to  the  card
15       and  then checks if can read it. It will assure you haven't been sold a
16       card with a smaller capacity than stated.
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18       When writing to flash drive, f3write  fills  the  filesystem  with  1GB
19       files named N.h2w, where N is a number (i.e. /[0-9]+/).
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21       WARNING: all data on the tested disk might be lost!
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OPTIONS

24       --start-at=NUM
25              Initial number of file names. Default value is 1.
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27       --end-at=NUM
28              Final number of file names. Default value is "infinity".
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EXAMPLE

31       To write over a flash drive mounted at /media/TEST:
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33             $ f3write /media/TEST
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35       To read this flash drive:
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37             $ f3read /media/TEST
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SEE ALSO

40       For detailed information about the F3 tools, see:
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42       http://oss.digirati.com.br/f3/
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AUTHOR

45       F3 was written by Michel Machado <michel@digirati.com.br>.  This manual
46       page was first written by  Joao  Eriberto  Mota  Filho  <eriberto@erib‐
47       erto.pro.br>.
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51F3 7.0                           December 2017                           F3(1)
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