(Or "hard disk controller", HDC) The circuit which allows the CPU to communicate with a {hard disk}, {floppy disk} or other kind of {disk drive}. The most common disk controlleRS in use are IDE and SCSI controlleRS. Most home peRSonal computeRS use IDE controlleRS. High end PCs, workstations and network {file serveRS} mostly have {SCSI adaptoRS}. (1998-03-16)