@student_sol, I'm actually trying to compare all hard disks in general. Come to think of it though, there should be two categories, "internal hard disks" and "external hard disks", right? Or should I just use "none specified" when building the database?
@cjl, would it be better to try getting the number of platters for each hard disk? Then the visitor could just extrapolate capacity/platter by division, right?
@geofelt, this is usually listed on spec pages as "max data transfer rates" or something similar? And yes, thanks for pointing out interface rates.