Im going to buy a secong HDD and some RAM. i was looking over the HDD specs and i noticed in said as the interface 'Ultra ATA-100' (http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=715475&sku=THD-1600JB). now my motherboard (http://developer.intel.com/design/motherbd/av/index.htm) has Four Serial ATA interfaces, but it doesn't say anything about ultra serial ATA. i'm pritty sure that this doesn't matter but i just thought i better check before i place the order.