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| Disk Controller. |
Disk Controller: a disk drive is connected to and controlled by a disk, controller. Which interprets the commands for operating the disk drive, since disk is a direct access storage device. the disk controlled typically support only, read and write commends, the disk address. consisting of surface number, cylinder track number and sector number needs to be specified as parameters of the disk read and write commands-often, a disk for controller is connected to and controls more than one disk drive, in this case the disk drive number must. also be, specified as a parameter of read and write commands so that the read/write operation is carried out on the specified disk surface of the correct disk drive.