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WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
H2testw - Data integrity test for USB sticks and other media
WizTree - WizTree quickly finds the files and folders using the most space on your hard drive. It scans the MFT (Master File Table) instead of crawling the entire disk which makes it very fast.
FakeFlashTest - Tests USB Flash drives and Flash memory SD cards to determine if they are fake (not full capacity).
SpaceSniffer - SpaceSniffer is a freeWare (donations are welcome) and portable tool application that lets you understand how folders and files are structured on your disks.
chkdsk - A command line tool to check for errors on and repair ntfs filesystems.