HDD Regenerator is a software which provides a dual function. It can repair a hard drive and retrieve all lost data.

MHDD is the most popular freeware program for low-level HDD diagnostics. MHDD supports these interfaces: IDE, Serial ATA, SCSI.

Acronis Drive Monitor is a software monitor server, workstation and PC hard disk drives.

Ultimate Boot CD is a bootable CD that contains tools for your computer's BIOS and CPU, Boot Management, Data Recovery, Device Info, etc.

Victoria is an experimental program to analyze your HDD, so you can see the health and the performance in detail. It can also perform surface tests.