Here's how I upgraded my laptop hard drive. Go into System Information in Windows XP and look under Hardware Resource/Components/Storage/Disks. What I did was look under Model: You'll see whatever brand it is. Just copy that and paste into google to look up the specs for it. With a little bit of research, you'll come across what type of interface your hard drive uses. Mine happen to use the SATAII 3gbps. Most likely, it's the 2.5" form factor hard drives though because all mobile hard drives are that size.