Template:POTD/2011-02-11

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Head crash
A head crash is a hard-disk failure that occurs when a read–write head of a hard disk drive comes in contact with its rotating platter, resulting in damage to the magnetic media on the platter surface and usually leaving the data unrecoverable. The damage is visible here as a circular mark. A head crash can be initiated by dirt or by excessive shock or vibration.Photo: Alchemist-hp