• A complete and unexpected program or system halt. Caused by a program deficiency or a hardware failure. Also called abnormal termination, abnormal end, or bomb.
  • A hard disk failure in which the read/write head collides with the surface of a disk. This may be caused by a foreign object such as dust, or a misalignment. data is destroyed, and generally both the read/write head and the platter must be replaced. Also called head crash.

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