If you've got an older computer, you'd probably want to avoid using one of the newer SATA drives unless you've got an SATA interface on the mother board. Stick with an older IDE drive. Depending on the age of your computer, it may not accept the SATA drives. I'm told (no personal experience with it - didn't want to mess with it) that you can adapt a computer to accept an SATA drive, but that results are a bit "iffy." If you've got an IDE drive in there now, I'd suggest sticking with an IDE drive until you upgrade your system. Then all you'll want to buy will be the SATA drives because you'll probably only have one - if any - IDE port.