hey guys I'm planning on upgrading my 15" MBP with a SATA3-SSD and an additional HDD sitting in the ODD bay. For performance: does it make a difference when installing just a 5400rpm drive instead of one with 7200rpm? I'll have the system and all applications on the ssd and use the hdd for storage (photos, movies, music, documents and stuff like that) only. I'm thinking about getting a 750GB Hitachi (5K750) because it has plenty of capacity and should be really power efficient, cool and quiet. Would I feel a difference in speed (like loading times in iPhoto/Photoshop or iTunes etc.) when using a 7200rpm drive like the Hitachi 7k500 or the Scorpio Black 750GB?