Whats is HDD Head crash?
A head crash is a specific type of hard disk failure, and occurs when the read-write head of a hard disk drive touches its rotating platter resulting in catastrophic damage to the magnetic media on the platter surface. The head normally rides on a thin film of moving air entrapped at the surface of the platter. The topmost layer of the platter is made of a Teflon-like material that acts like a lubricant. Underneath is a layer of sputtered carbon. These two layers protect the magnetic layer (data storage area) from most accidental touches of the read-write head. A head crash can be initiated by a tiny particle of dirt or other detritus which can cause the head to bounce against the disk, destroying the thin magnetic coating on the disk. The Disk read-and-write head is made using thin film techniques that include materials hard enough to scratch through the protective layers. Since most modern drives spin at rates between 5,000 and 15,000 rpm, the damage caused to the magnetic coating ca
