I put a Crucial M4 in the HDD slot, and moved the 750GB stock drive to an Optibay adapter. It's all working, but system profiler sez the negotiated speed on the HDD is half speed. Here's part of the report: Intel 6 Series Chipset: Vendor: Intel Product: 6 Series Chipset Link Speed: 6 Gigabit Negotiated Link Speed: 3 Gigabit Description: AHCI Version 1.30 Supported APPLE HDD HTS547575A9E384: Capacity: 750.16 GB (750,156,374,016 bytes) Model: APPLE HDD HTS547575A9E384 Revision: JE4AD70E Serial Number: J2640054JD39KE After some, research, it looks like the main problem here is the HDD itself, it is referred to in reviews as slow, plus it's Sata II (3gb/s) which is what the report is showing... so it's going to have to go, or I'm going to need a larger (512 gb) system SSD. I just ran a test using Windows7 (bootcamped) on first the internal HDD in the optibay vs. a Samsung 840 SSD in a Thunderbolt adapter (Seagate GoFlex desktop adapter). Photoshop CS6 64 bit opened in 2.5 seconds (from the Win7 SSD). Photoshop CS6 64 bit opened in 23 seconds (from the Win7 HDD). REALLY?? Yes, REALLY! Why would Apple put such a dog in a Sata III capable laptop??? 'Nuff said.