I rather not rebuild my MBP with an Optibay, because I don't want to screw up and damage it. So i'm thinking about the following options. 1. Get a 240 gb SSD ( i'm going to run out of disk space and it's expensive ) 2. Get a 1Tb/750gb HDD ( very cheap, more storage space and faster than the stock HDD ) 3. Hope that the 2012 MBP has Flash + HDD without the need of Optibay ( since those Flash modules are inserted straight on the Motherboard/Logicboard hence saves alot of space in comparison to a regular SSD ).