This is a simple proceedure as long as your Roms are not the old first version which did not support master/slave IDE drives on the same bus. You can get a HD at Staples or perhaps even Walmart - Maxton, Western Digital, IBM, all will work (I believe there is a limit of the bus on drives over 120GB). I Would suggest a 7200rpm drive as the speedup is noticeable. You will also need a cable with two end connectors and one in the middle - available at Radio Shack. Mac stuff at Radio Shack, Staples, Office Depot, and Walmart? Will wonders never cease.