My girlfriend's old macbook (model: MC516LL/A) has a failing hard drive (This drive has a hardware problem that can't be repaired. Back up as much of the data as possible and replace the disk... S.M.A.R.T. Status: Failing) I was looking around to see if I could get a replacement. But I want to check here and see if that would even be worth trying or not. Definitely can't afford to replace her computer for the moment. Want to make sure I get one that is compatible with her machine as well. Hers is 750GB size I believe, but there are all different types of brands and models, I wasn't sure if anything with these specs would fit. Or if there were any options to upgrade (I looked and don't think SSD is an option for that machine, but may be mistaken). Any ideas on what would be a good choice? Thanks!