When buying an external enclosure, you need to pay attention to THREE interface details:
1. What interface between enclosure and computer? - USB, eSATA, Firewire, or a combo?
2. What interface between enclosure and the HDD that mounts inside - IDE (PATA) or SATA?
3. What type of drive is going inside - 3½" typical desktop HDD, or 2½" typical laptop unit, or something else?