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hard disk
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storage (In contrast to floppy disk). One or more rigid
magnetic disks rotating about a central axle with associated
read/write heads and electronics, used to store data. Most
hard disks are permanently connected to the drive (fixed
disks) though there are also removable disks.
High speed disks have an access time of 28 milliseconds or
less, and low-speed disks run 65 milliseconds or more. The
higher speed disks also transfer their data faster than the
slower speed units.