Dispexplorer 

Hard disk utility that helps you track disk space usage. It uses stylish and unique 3d graphics. Helps you understand where is lost most of disk space. It's unique disk utility that makes your file system more organized. More info on site.
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Hard Drive Test Pilot 

The award winning Hard Drive Test Pilot is now packed with better tools and utilities to find and fix those problems that might cause your disk and/or Operating System to fail. On top of that, HDTP 2.5 scans your files for errors and viruses.
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Disk Repair Software 

Hard disk repair, bad sector, logical bad sector repair tool, disk repair utility, free bad sector removal software, floppy disk repair software, hard disk utility, Track 0 Bad Disks, bad-sector repair utility, partition repair, hard disk recovery.
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