Hi, I have tried reading about the above but do seem to get a little lost, any connents/explanations would be much appreciated. I would like to add a SATA 250gb hdd to my single IDE hdd machine, I think I need a pci card to be able to do this. It would also be nice to add another 250gb drive say in six months time, and have the option to add maybe another two later on - saying that is there a limit to the number of hdd's? It sounds relatively straight forward but I am afraid I am totally lost as to what I need to achieve the extra expandable space I would love to have. Would RAID come into the equation at all? (sorry don't quite understand it) I have a 500gb firewire drive that I will be able to use as back up. I look forward to hearing any comments. Thanks in advance.