Master
A setting adjusted using a jumper found on a computer peripheral, such as a hard disk drive, as shown below. This setting sets the drive to be the primary drive and allows for multiple devices to be connected to a single connection. Computers can only have one master per channel on a single IDE/EIDE cable and other drives connected to the same cable would be set as slave or cable select.
Also see: Cable select, CD-ROM definitions, DS, Hard disk drive definitions, Jumper, Primary, Slave