chkdsk - A command line tool to check for errors on and repair ntfs filesystems.
HD Tune - HD Tune Pro is a hard disk / SSD utility with many functions. It can be used to measure the drive's performance, scan for errors, check the health status (S. M. A. R.
Macrorit Disk Scanner - Macrorit Disk Scanner is a third party disk surface portable tool for scan disk bad sectors which...
Chkdsk-GUI - A GUI front end to Microsoft's command line Check Disk program.
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.
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.