If you have bought an USB flash / thumb drive, then a word of Caution…..because many sellers on popular sites on eBay are offering its users Fake / Counterfeit drives in disguise of Good Brands like Sony, Corsair, Kingston etc.
Many drives are coming out of china which look just like the Originals but are unreliable, sometimes contain spyware / keyloggers or show incorrect memory capacity.
If you have a drive which shows incorrect capacity, opt for an replacement right away and do not store any confidential or private data on the flash drive.
If you are looking for a new USB Flash drive / Memory Card etc. then you *must* buy from an authorised seller. Generally a list of authorised sellers is available on the manufacturers website.
If you have purchased from eBay or other third-party client, then it makes sense to test your newly purchased drive for genuineness.
H2testw is a software which checks your drive for genuineness and generates a report. It has been awarded Gold Standard for its detection capabilities.
The software is small, easy to use and no need to install. It has English / German language options.
DOWNLOAD THE SOFTWARE HERE:
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http://www.mediafire.com/?24xzjnqmdbg
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The Program screenshot by the author of this site:

The program generates an output text which can be copied to clipboard. You can test your Drive for genuineness and paste your drive report output here on this site in your comments….
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Sample Output For A Fake 64 GB Drive
The media is likely to be defective.
3.8 GByte OK (8084847 sectors)
58.6 GByte DATA LOST (122921617 sectors)
Details:710.5 KByte overwritten (1421 sectors)
7.6 MByte slightly changed (< 8 bit/sector, 15630 sectors)
58.6 byte corrupted (122904566 sectors)
710.5 KByte aliased memory (1421 sectors)
First error at offset: 0×000000003cef8470
Expected: 0xeb7ac43a237c5170
Found: 0xeb7a843a237c5170
H2testw version 1.3
Writing speed: 9.24 MByte/s
Reading speed: 10.8 MByte/s
H2testw v1.4
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Here is a sample output for a Genuine Drive (Corsair Flash Voyager 8GB USB Flash drive):
Test finished without errors.
You can now delete the test files *.h2w or verify them again.
Writing speed: 5.04 MByte/s
Reading speed: 24.9 MByte/s
H2testw v1.4
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Written By TuX……..Paste your reports as comments…..Help fight against fake drive sellers which are looting innocent people…..