Hard disk controller
1. Abbreviated as HDC, the hard disk controller is the interface that enables the computer to read and write information to the hard drive. 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.
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
Computer hard drive help and support.
2. The term hdc is also the device name for the master ATA device on the second channel.
Also see: Hard drive definitions, Motherboard definitions