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F3 Test of Microdata 32GB Micro SD Card | http://www.ansonchina.com | by https://git.io/ilyaigpetrov

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packed microdata sd card

About F3

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

f3 - Fight Flash Fraud

f3 is a simple tool that tests flash cards capacity and performance to see if they live up to claimed specifications.

F3 stands for Fight Flash Fraud, or Fight Fake Flash.

The Test

# Raspbian lite was installed and partition was enlarged in raspi-config.

$ sudo f3write /media/microdata-32gb-sd-card/
F3 write 7.1
Copyright (C) 2010 Digirati Internet LTDA.
This is free software; see the source for copying conditions.

Free space: 26.70 GB
Creating file 1.h2w ... OK!                          
# ...
Creating file 27.h2w ... OK!                        
Free space: 16.00 MB
Average writing speed: 5.03 MB/s

$ sudo f3read /media/microdata-32gb-sd-card/
F3 read 7.1
Copyright (C) 2010 Digirati Internet LTDA.
This is free software; see the source for copying conditions.

                  SECTORS      ok/corrupted/changed/overwritten
Validating file 1.h2w ... 10996110232097152/        0/      0/      0
# ...
Validating file 26.h2w ... 2097152/        0/      0/      0
Validating file 27.h2w ... 1427616/        0/      0/      0

  Data OK: 26.68 GB (55953568 sectors)
Data LOST: 0.00 Byte (0 sectors)
               Corrupted: 0.00 Byte (0 sectors)
        Slightly changed: 0.00 Byte (0 sectors)
             Overwritten: 0.00 Byte (0 sectors)
Average reading speed: 6.26 MB/s

$ sudo f3probe --destructive --time-ops /dev/sdb
F3 probe 7.1
Copyright (C) 2010 Digirati Internet LTDA.
This is free software; see the source for copying conditions.

WARNING: Probing normally takes from a few seconds to 15 minutes, but
         it can take longer. Please be patient.

Good news: The device `/dev/sdb' is the real thing

Device geometry:
                 *Usable* size: 29.16 GB (61157376 blocks)
                Announced size: 29.16 GB (61157376 blocks)
                        Module: 32.00 GB (2^35 Bytes)
        Approximate cache size: 0.00 Byte (0 blocks), need-reset=no
           Physical block size: 512.00 Byte (2^9 Bytes)

Probe time: 10'13"
 Operation: total time / count = avg time
      Read: 1.11s / 4815 = 231us
     Write: 10'11" / 4192321 = 145us
     Reset: 3us / 1 = 3us
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