f3read - Man Page
test real flash memory capacity
Examples (TL;DR)
- Validate a device by checking the files in a given directory:
f3read path/to/mount_point
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:
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>.