H2testw

Data integrity test for USB sticks and other media An advantage over other tools is, that it does not need administrative rights to access the device - but it should not be NTFS formatted, as it does not allow to test everything.

Free Windows

Quick Disk Test

Quick Disk Test fills a disk with test data and verifies that it can be read back without errors.

Free Open Source Mac OS X Windows Linux

USB Flash Drive Tester

Flash card/drive tester allows testing of any removable media including SD, MMC, CF, USB flash pen drives for bad or unstable sectors. Especially useful for testing for...

Free Windows

USB Memory Stick Tester

USB Memory Stick Tester is a small application designed to help testing removable storage media (such as USB memory sticks) for defects.

Free Open Source Windows