I started a thread here, but it got buried and don't want to bump it up. And anyway the point here is that I want to make sure that I am buying the right type of HD, since it's confusing. I took a snapshot of the one I have already: As you can see it's an Ultra ATA. Can I add a SATA? Or what? Thank you so much for your help! I could appreciate a link to a specialized forum, if you can't help otherwise.