System information under Serial-ATA might identify the bays, but I think only the Mac Pro does this. My issue with the 15 inch was that the SSD would negotiate a 3GBit connection in the optical bay, but the cabling really only supported 1.5GBit. The hard drive bay was fine at 3GBit, and potentially 6GBit had I had a compatible drive.
I did find this thread with similar complaints even with the drive in the hard drive bay:
http://communities.intel.com/thread/29859One person said enabling TRIM did seem to help him.
I had forgotten the 530 was the SandForce based Intel drive. Also make sure you have the newest firmware for it. I still don't personally trust them, but YMMV.
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