Cable Select (CSEL)

An optional feature of ANSI ATA specification (IDE cable connector #28). It is necessary a PC motherboard able of supporting this feature and a special IDE cable with a specially twisted pair of wire.

Usually, the user must set a particuar jumber on the drive itself to enable CSEL. Drives configured in a multiple drive system are identified by CSEL's value (assuming a dual drive IDE cable): - If CSEL is grounded, then the drive address is 0. This will be the first drive on the IDE cable (the connector in the middle). It is the Primary Drive. - If CSEL is open, then the drive address is 1. This will be the drive plugged into the second connector (the last one on the cable). It is the Secondary Drive.

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