If you’ve ever purchased a second hand USB flash drive from a friend or even a new one from eBay and alike you might want to verify it true capacity. Even though Windows might seem to be reporting the correct capacity of the drive, that information might not be sufficiently enough to prove that it is truly a USB flash drive of the advertised capacity.

eBay has lots of cheap stuff that you can buy. The price are normally lower than the retail suggested price to attract buyers but beware! Not all cheap stuff are good and some of them can be counterfeit.



H2testw was developed to test USB sticks for various kinds of errors. It can also be used for any other storage media like memory cards, internal and external hard drives

and even network volumes. To run the test for your drive, just plug in the drive, format it in Windows, run H2testw, select the target, and click Write + Verify button. H2testw writes files of up to 1GB to the chosen destination and names them 1.h2w, 2.h2w, 3.h2w and so on. If the target directory already contains such a set of files H2testw will offer to verify them. After it is done the software leaves its test files on the medium. You can erase them if you like or verify them again.

Caution: Do not use this tool if there is any important data stored on the drive and/or if it is the boot disk of your system.

The executable file H2testw.exe needs no installation and can be directly run. It was developed for Windows XP and Vista but I’ve tested it on Windows 7 64-bit which worked without issues.

Download here (German & English)

Like this utility? then you might like to check out this similair program USB Flash Tools