PCI IDE controller cards can also be used. The main 12 gig can stay. The controller card will give you more IDE channels or even SATA and IDE like this one. click here This one would give you space for upto 4 more IDE devices and will support drives over 127Gig ( does not matter about the bios ) for £12.87 click here
So you could have a couple of SATA drives or a couple of 200Gig ATA133's if you wanted. :-)
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