Updated: 11/13/2018 by Computer Hope

A setting adjusted using a jumper found on a computer peripheral, such as a hard 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.

Jumpers on back of IDE hard disk drive

Note: If the traditional terminology master/slave is considered politically insensitive, alternative terms include device0/device1, primary/secondary, leader/follower, or primary/replica.

Cable select, CD terms, DS, Hard drive terms, Jumper, Primary, Slave