Cable Select (CSEL) – An alternative option which can be used in place of setting Master/Slave jumpers in the designation of drives in a dual drive configuration. Master/Slave designation is based on the position of drives relative to the cable. Special cabling is required by the system manufacturer to selectively ground the CSEL signal on one of the IDE cable connectors. For example, when one of the drives is connected to the grounded CSEL conductor, it configures itself as a Master. When the second drive is connected to the other connector, on which CSEL is not grounded, it becomes slave. This eliminates the need for unique jump ring configuration between the Masters and slave drives.