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With 80 wire cables, the position of the drive on the cable determines master and slave. That's the purpose of the CS jumper - cable select. The master goes on the end of the cable and the slave goes on the connector in the middle of the cable. The correct end of the cable also has to be put on the motherboard. Master and slave jumpers are legacy - it's for old 40 wire cables that don't do the drive selection internally.
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