Hello Linux Friends, i am back. After 4 years i just returned. The only think that we can be sure of is that everything changes. I had to try another blogging system but just found that i missed this one all the time. Finally i decided to return to this platform.
This time, how to detect a fake usb and know its real storage ? Well, i fall in the temptation of cheap usb and huge storage from ebay!! Oh yes!! How smart i am, i can purchase it cheaper and not paying so much!! But well... reality always wins and the 128GB usb was just not working... after researching a little bit i found this tool for linux to detect the real storage for an USB. Obseve, it tells it is from 125GB but the real size is 30GB.
f3probe --destructive --time-ops /dev/sdb
F3 probe 6.0
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.
Bad news: The device `/dev/sdb' is a counterfeit of type limbo
You can "fix" this device using the following command:
f3fix --last-sec=64897023 /dev/sdb
Device geometry:
*Usable* size: 30.95 GB (64897024 blocks)
Announced size: 125.00 GB (262144000 blocks)
Module: 128.00 GB (2^37 Bytes)
Approximate cache size: 0.00 Byte (0 blocks), need-reset=no
Physical block size: 512.00 Byte (2^9 Bytes)
Probe time: 3'08"
Operation: total time / count = avg time
Read: 253.0ms / 2156 = 117us
Write: 3'08" / 2151 = 87.5ms
Reset: 0us / 0 = 0us
This time, how to detect a fake usb and know its real storage ? Well, i fall in the temptation of cheap usb and huge storage from ebay!! Oh yes!! How smart i am, i can purchase it cheaper and not paying so much!! But well... reality always wins and the 128GB usb was just not working... after researching a little bit i found this tool for linux to detect the real storage for an USB. Obseve, it tells it is from 125GB but the real size is 30GB.
f3probe --destructive --time-ops /dev/sdb
F3 probe 6.0
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.
Bad news: The device `/dev/sdb' is a counterfeit of type limbo
You can "fix" this device using the following command:
f3fix --last-sec=64897023 /dev/sdb
Device geometry:
*Usable* size: 30.95 GB (64897024 blocks)
Announced size: 125.00 GB (262144000 blocks)
Module: 128.00 GB (2^37 Bytes)
Approximate cache size: 0.00 Byte (0 blocks), need-reset=no
Physical block size: 512.00 Byte (2^9 Bytes)
Probe time: 3'08"
Operation: total time / count = avg time
Read: 253.0ms / 2156 = 117us
Write: 3'08" / 2151 = 87.5ms
Reset: 0us / 0 = 0us
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