Disk controller
Printed circuitry that contains the necessary instructions of diskette drives. The disk controller is responsible for such drives as the hard disk drive, floppy disk drive, CD-ROM drive, and any other drive. Today, most disk controllers are found on the computer motherboard and are either the older IDE or newer SATA. More specialized controllers such as a SCSI will often need an interface expansion card.
Also see: Hard drive, Hard disk drive definitions