Many computer users take hard drive reliability for granted, not even thinking about minimal possibility of drive crash. They suppose that hard disk drive manufacturers have done a great improvement to their products towards disk reliability. And they have, but the reality is that all disks die eventually. Even if you have a recent backup, sudden disk failure is a minor catastrophe. How can we protect ourselves from a sudden hard drive crash? One of the ways is through SMART (Self-Monitoring Analysis and Reporting Technology) by predicting future failures.

The essential moment is that the user should understand how drives fail and why. There are two classes of failures the hard disk can suffer: unpredictable and predictable.

Unpredictable failures happen suddenly, without warning and can be caused by catastrophic events, handling damage, static electricity or an electronic component burning out, and there is nothing that can be done to foresee or stay away from them.

Predictable ones are 60% mechanical and occur gradually over time. The degradation of drive performance may include head crashes, head contamination, bad solder joints, bad curcuit board connections, motor break down, worn down bearing, spinning inability, excessive run out, bad servo positioning.

Most hard drives lose their performance slowly, and the disk is able to monitor and diagnose many elements