I need to replace my Aacer Aspire ES1-711 WD Sata HD. I don't remember how big the one in the laptop is (close to 1TB I think) and I can't get into the laptop to find out. What HD do I buy to replace it? I know nothing about the new SSD and think I would just rather stick with the old type Sata. It would help if I had specific info to look for. TIA