So i have a Macbook Pro 15" Mid 2012. I recently submitted it for repair under the EU Claim but annoyingly they found the most minuscule drop of liquid inside the case. It hasnt done any particular damage as such its just stained it ever so slightly. But its enough that they refused to uphold the claim. Now what i need to do is replace the battery, retina screen and some worn away keys which is easy enough to do myself, i just figured i would try and get it done for free first. However, i want to upgrade the hard drive inside. At the moment its a 256GB SSD and i would like to increase to 512gb if not 1TB. But i am unsure exactly which SSD to use for my machine. I was hoping that someone could offer some advice, maybe the make and model of a SSD drive that would be compatible?