In my current computer (not the one in my sig- still waiting for my RMA) i have 3 hdd's...i have a 40gb that came with this one (a dell), i have a 60gb i pulled out of my old computer, and i have a 160gb that i got recently because my other two were full. only the 60gb and 160gb are going into my new computer, but eventually, i will get a sata drive. so for now, 3 hdd's.