When I connect a 2nd SATA disk to a DELL Dimension, it's recognised by the BIOS but not by Windows (nor Partition Magic, nor AIDA). What I find odd is that I can see only 2 SATA plugs on the motherboard. However, the BIOS sees the original boot disk under Drive 0 and Port SATA-0. The new one is recognised as Drive 1 and Port SATA-2. What happened to SATA-1? I wouldn't mind except that this might be a reason why the new disk is not seen by Windows.