Currently Being ModeratedDec 7, 2011 12:39 PM (in response to TheMadMacMan)
Same problem here with my MacBook Pro 8,3. I installed an OWC mercury extreme pro 6G with data doubler into the optical drive. This didn't work at all, I could not write any data.
Then I installed a crucial m4 in the optical drive, with the OWC "data doubler" (optical to SATA drive converter bracket solution). This crucial m4 works sometimes, but there are severe problems - the drive stops working for several seconds now and then I think, which makes working with video impossible.
I should have read the "special compatibility notes" on the OWC website before buying my MacBook Pro and the OWC ssd:
"Testing has demonstrated that the 6Gb/s optical bay interface in 15" & 17" models is not consistently reliable. If your 15" or 17" model's optical bay has the 6Gb/s interface, we do not recommend the use of any OWC Mercury 6G SSD or other brand 6G SSD in the optical bay at this time. We only recommend the use of a 3Gb/s SATA 2.0 drive into 15" & 17" 2011 MacBook Pro optical bays.
13" Macbook Pro models with the 6Gb/s optical bay interface have been tested compatible with all OWC Mercury 6G SSD's."
A comment from Apple would be nice when they will solve this problem.
Currently Being ModeratedApr 20, 2012 6:47 AM (in response to p8guitar)
I was able to get SATA III 6Gb working reliably in the optical bay.
Currently Being ModeratedSep 11, 2012 7:49 AM (in response to TheMadMacMan)
Has there been any real solution to this. I plan on doing some testing on my late 2011 2.5ghz 17" MacBook pro, with dual owc mercury extreme pro 6g 480gb sad drives. I don't plan on using the data doubler from owc as it Has been tested and it doesn't work. Given the theory that there could be a cable shielding or shielding in general kind of problem, I am going to try using the drive caddy I got from eBay which encases the sad in aluminum mostly, and I try and work out some kind of shielding for the cable and see if this works.
Has anyone come up with a permanate solution to this performance killing problem.
Currently Being ModeratedDec 30, 2012 11:30 AM (in response to Way-dee)
Is it only SATA III problems? Does a SATA II drive work? I would be ok purchasing a SATA II SSD drive and sticking it in the bay if I know that it works.
I've tried an Intel SATA III SSD in the optical bay of both a late 2011 MBP 13" and a late 2011 MBP 15". Both laptops were unable to write to the drive. I was able to format it using FAT though.
There are some cheap-ish SSDs still that operate on SATA II (maybe some that can be set back to SATA II with a jumper?). I'm thinking they might be worth buying as they'll still be better for battery, noise and vibration than any other HDD that I could put in there. I'm thinking they'll also be faster, just not sure by how much. Thoughts?