I recently bought a new laptop. An Acer Extensa 5620-4020. After some internet looking it seemed to be the best bang for the buck. The down side is it's got Vista. I always hate a new operating system until after the learning curve but I can't find anything I like about Vista. Plus many of my programs won't work, even with patches. Anyhow, rather than do away completely with Vista or set up Vista and XP on the same HD I thought I'd just buy a new HD and install XP. Then keep the original HD (Vista) in reserve. The question is, I can't figure out what kind of HD it is. I e-mailed Acer and they weren't any help. Their info says the computer has a hard drive. I pulled the HD and besides the name, it had no info at all. The HD has two rows of flat pin connectors, forgot to count them. Any ideas?