When the read-write head of a hard disk touches the rotating platter, it causes damage to the platter surface thereby causing loss of data, termed as head crash. It causes the physical damage to the magnetic film on the platter’s surface. Every platter has a read-write head positioned over it, which reads from and writes data to the disk.
Very thin air layer lies between the read-write head and the platter surface, very small dust particle (present internally) could disrupt the functioning if it interferes in between read-write head and the platter surface thereby causing head crash. The damage loads onto other parts of the disk surface once the head crashes, leading to severe data loss. The head crashes only if it touches the platter surface. Head crash is also termed as disk crash.
A damaged read-write head cannot perform read-write operations. Head crash results in loss of critical data due to damaging of disk. The movement of read-write head above the platter surface is termed as flying, if flying is disrupted by the dust particles, it causes head crash. The distance between the head and disk surface is lesser than 3 nanometers.
Head crashes are destructive to hardware and cause major data loss, whereas program crashes do not cause loss to hardware. Read-write heads have thin films containing materials that can scratch the disk surface easily. The top layer of platter surface is made up of Teflon like material acting as a lubricant.
Causes of Disk Head Crash
Handling the Disk Head Crash
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