Is there a black and white rule/answer on which type of hard drive should go in which area (the original HD spot or the optical bay). I've seen people swear by the Optical bay for their SSD's and some people say the HDD should go there! I'm getting a late 2011 13" Macbook pro w/750GB i7 and this is honestly racking my brain! I planned on getting a Sandisk Ultra SSD 120GB (the difference in SATA II and III aren't a big deal to me) and putting it in the optical bay but now i'm not even sure about that. To top things off, i have no idea what TRIM is, will the SMS work with the 750GB drive in the optical bay, and any other cons to making this move will be. Sorry to ramble on and on but any help will be welcomed!