Cable select, also referred to by the acronym CS, is a disk drive jumper setting which automatically sets the priority of a disk drive by its position on its data cable. When cable select is enabled, the drive will configure itself as a master or slave depending on its position in the drive chain. For cable select to work, an IDE/EIDE drive must have its jumpers set to CS and be using a cable that supports cable select.
Users can identify if the flat ribbon cable supports cable select by examining the cable for any of the below characteristics.
- The cable is an 80-wire with 40-pin connector Ultra ATA cable.
- Cable has master and slave printed on the cable or on the cable connectors.
If a drive is not detected while using cable select, try setting one drive to Master and the other to Slave, instead of using cable select. If after changing the jumpers, the drive is still not detected, it's likely a bad drive.