I recently purchased a 64Gb kingston Usb for $28.00 canadian. Then I did a test to see if it was fake because of file errors will transfering files from computer to computer.
The test was H2Testw.exe witch failed showing a fake size of 43000Mb.
Later it flashed back to a 2Gb flash drive.(Kingston DataTraveler 200 64Gb)
http://www.ziggi.com.br/downloads/h2testw click on link, then click on button
(Clique par Biaxar) to download.
Do not worry you will hear a beep. Right Click on the yellow bar at the top and click on download file. It will be in a zip file.
Search for WinRAR to unzip it.
Now you can test your USB to see if it fails this test.
If it passes you are a happy costumer. If not then you have to reflash to the original
settings of the flash drive.