It's an interesting drive. The part number is QML20000LD-A. that's the quantum part number. There is also a Compaq number and an IBM number. According to this website it is an ATA100 drive. Here is the link to where I found the info.
http://www.baber.com/drives/internal...de_current.htm

It says that the RPMs are like 4500. Sheesh.