H2testw - Data integrity test for USB sticks and other media
DiskBoss - A file manager with a focus on storage side of things: Monitoring, classing, storage, duplicate...
FakeFlashTest - Tests USB Flash drives and Flash memory SD cards to determine if they are fake (not full capacity).
DiskWave - DiskWave is a free utility to help you determine where most of your hard drive space is consumed.
chkdsk - A command line tool to check for errors on and repair ntfs filesystems.
DiskSavvy - DiskSavvy is a free, fast and easy-to-use disk space analyzer utility allowing one to analyze disk...