I have a 27" 2011 i5 iMac with a 1 tb internal drive. I'd like to add an SSD for the OS and applications, and keep the big files on the drive I have now. At first I thought this was going to be easy, but the more I read around, the more questions I have... Further complicating things is that fact that I already have an SSD-- a 3.5" OCZ Vertex 2. Yes, you read correctly, it's a 3.5" drive. Not 2.5". I would really, REALLY like to use this drive if possible. I understand that it's not as fast as a SATA3 drive, but I have no real need for speed. I'd like to keep using this until SSDs mature a bit (aftermarket drives get TRIM support from Apple, lower failure rates, longer life, etc etc). That said... 1) Does the mid 2011 27" iMac have one 3.5" bay or two? As in, when Apple adds an SSD, I assume they use a 2.5" drive. Is that all there is space for? (this is the sole criteria that would cause me to buy a new drive instead of using the existing). 2) To connect the drive, do I need anything other than this? http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=260803894476&ssPageName=ADME:L:OC:US:1123 3) Is there anything else I'm overlooking? Mounting brackets, cable adaptors... anything? Again, I really would much rather save the money and use my current Vertex 2 if possible.... TIA!