Perhaps, this is more simple than I imagine. I want to purchase a new Hard Drive for my MBP as the current one is faulty (logging off randomly, slow, acting weird - it's been going on for about 2 years). NOW, I want to get a new hard drive for my Macbook Pro 17" A1297. I have 2 questions: 1 - Do all hard drives made for Macbooks work for all models or do I need to search specifically for my model? 2 - Do hard drives come pre-installed with the OS? Or how do I got about installing it? I would truly appreciate any help provided.