Disk Drill is an invaluable do-it-yourself data recovery OS X tool.

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.

Hard Disk Sentinel monitors and tests the health of your computer's hard disks.

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

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.

CrystalDiskInfo is a utility tool that can tell you about the hardware performance of your hard disk, including how likely it is to stop operating in the near…

GSmartControl is a graphical user interface for smartctl (from smartmontools package), which is a tool for querying and controlling SMART.

Smartmontools (S.M.A.R.T. Monitoring Tools) is a set of utility programs (smartctl and smartd) to control and monitor computer storage systems using the Self-…

HDDScan is a Free test tool for hard disk drives, USB flash, RAID volumes and SSD drives. The utility can check your disk for bad blocks in various test modes…

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