The SATA Raid card supports 4 devices, 1 per connector. There is no master/slave type stuff with SATA as far as I can see, so two connectors means two drives.

the MB also has a number of SATA connectors on it, but I'll probably get a normal IDE drive just for windows.

Paul.
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Paul Haigh, Reg. 4120 (mk1) 6GB, Blue, 00254 (mk2) 12GB, Red, 00357