| Generally abbreviated as HDC, the hard disk controller is the interface that enables the computer to read and write information to the hard disk drive. Today, hard disk 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 Also see: Motherboard definitions |
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