HDD Health is a free hard disk monitoring utility that monitors health of your hard disk, and alerts you in advance about potential hard disk failure. HDD Health is a failure prediction software for hard disks. Other hard disk monitoring software include DriveSMART, and Acronis Drive Monitor.
HDD Health uses S.M.A.R.T. technology that is present in most of the modern hard drives. It monitors the parameters reported by S.M.A.R.T.
HDD Health can use multiple options to alert you about possible hard disk failure. It can send you an email, show a pop-up on screen, and log the events. HDD Health is a good software to have on the machines that have important data on hard disk ( of course, make sure you also keep a backup of important data).