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Term
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Description
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HAD
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Head Disk Assembly
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Hard Error
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An error that is not able to be overcome by repeated readings and repositioning means.
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Hard Sectored
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A technique where a digital signal indicates the beginning of a sector on a track. This is contrasted to soft sectoring, where the controller determines the beginning of a sector by the reading of format information from the disk.
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Head
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The electromagnetic device that write (records), reads (plays back), and erases data on a magnetic media. It contains a read core(s) and/or a write core(s) and/or erase core(s) which is/are used to produce or receive magnetic flux. Sometimes the term is all inclusive to mean the carriage assembly which includes the slider and flexure.
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Head Crash
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The inadvertent touching of a disk by a head flying over the disk (may destroy a portion of the media and/or the head).
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Head Loading Zone
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The non-data area on the disk set aside for the controlled takeoff and landing of the Winchester heads when the drive is turned on and off. Dedicated annulus on each disk surface in which heads are loaded, unloaded, or flying height is established. Head-disk contact may occur in some instances; no data is recorded in this area.
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Head Positioner
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Also known as actuator, a mechanism that moves the arms that carry read/write heads to the cylinder being accessed.
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