Check USB Flash Drive For Errors Using H2testw
Having problems with your USB Flash drive or an external hard drive? Check the drive for read/write errors using H2testw, a free portable utility that not only checks for drive errors by writing and erasing test data on it, but also reports the actual space on the drive.
While there are dedicated USB Flash Drive testers, H2testw works with many storage media such as internal as well as external hard drives, pen drives, memory cards, and network drives. This is a standalone program, so extract the zip file to a folder and run the exe file in it. Choose the language, English or Deutsch (German) and you are set to perform read and write tests on the chosen drive or folder.
H2testw helps in you finding if a USB drive is really of the capacity as claimed by the manufacturer. With so many fake USB drives flooding the market, it is recommended that you run a test on their size before you buy one.

H2testw works with Windows 7, Windows Vista, and Windows XP.
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