Quote (N3rd @ Oct 21 2014 05:10pm)
He was telling me it is a seagate brand 1tb but this is the one they show for its replacement. I guess my dad upgraded it when he bought it online. What hard drive would be compatible?
It's not always the case that an unrecognized HDD is bad. Could be loose connection, a changed BIOS setting, sometimes just the MBR is messed up.
I can't tell from you title or your post if the HDD that isn't recognized is the one the Operating System is installed on.
Tell us if you can still boot into Windows. Some laptops and desktops have more than one drive. To help answer your questions we need to know this info.