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disk controller
(redirected from Hard drive controller)

    Also found in: Wikipedia 0.04 sec.

The circuits that control data transfer to and from the disk drive (floppy disk, hard disk, optical disc). In a PC, an IDE disk controller is typically built into the motherboard, and a cable plugs into the controller socket on one end and connects to the drive on the other. On earlier PCs, the disk controller was a separate card plugged into a PCI or ISA slot. However, when SCSI drives are used, a SCSI disk controller (SCSI host adapter) is typically not built in, but available on a separate card. See hard disk, IDE and SCSI.

(hardware, storage)disk controller - (Or "hard disk controller", HDC) The circuit which allows the CPU to communicate with a hard disk, floppy disk or other kind of disk drive.

The most common disk controllers in use are IDE and SCSI controllers. Most home personal computers use IDE controllers. High end PCs, workstations and network file servers mostly have SCSI adaptors.
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This in turn activates the hard drive controller to suspend a read or write operation and park the head safely away from the surface of the disk.
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0 GB ATA-100 Hard Drive ---------------------------- ----------------------------------------- Hard Drive Controller Integrated 32 Bit Ultra ATA-100 Controller ---------------------------- ----------------------------------------- CD-ROM 48X CD-ROM ---------------------------- ----------------------------------------- Floppy 1.
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