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Definition of "disk head" |
read/write head used in a disk drive. Such a head may be fixed-gap, in which the head is positioned at a fixed distance from the disk surface; contact-head, in which the head is always in contact with the surface; and aerodynamic, in which the head rests lightly on the surface when the disk is motionless but floats a small distance above when the tape is rotating. Typically, contact heads are used in floppy disks, and aerodynamic head are used in Winchester disks. In earlier systems, “fixed-head disks” having one read/write head per track were used in some disk systems, so the seek time was eliminated. However, since modern disks have hundreds of tracks per surface, placing a head at every track is no longer considered an economical solution. |
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