Hard disk controller

1. Abbreviated as HDC, the hard disk controller is a circuit that enables a computer to read and write information to a hard drive. The HDC also acts as a bus, connecting the hard disk to the rest of the computer's components. Today, hard drives have the controller built on to them, usually a circuit board that covers the bottom or on the back portion of the drive.

Laptop hard disk drive hard disk controller

As can be seen in the above picture of the laptop hard drive the bottom of the drive has a circuit board, which contains the hard disk controller.

2. The term hdc is also the device name for the master ATA device on the second channel.

Also see: Hard drive terms, Motherboard terms