Hello, How are you? I'm wanting to upgrade my MBP, but I really need some advice and knowledge. My MBP is a 17" early 2009 Unibody C2D 2.66. When I bought the MBP, I replaced the standard 320gb drive with an OCZ Agility 1 SSD with 120gb. It has run flawlessly and I really like the SSD. Now, for my needs, I need a second HDD on the laptop. I bought an Optibay and I'm thinking about the following: Buy a Western Digital WD10TPVT 1tb drive. Put the WD10TPVT on the HDD slot of the MBP and the SSD on the optibay. Now, my questions: - The WD10TPVT is 12,5mm thick. Will it fit without any issue? - Does the WD10TPVT have any sort of sudden motion sensor? Will it cause issues? - I currently have the OS on the SSD. If I put the SSD on the optibay, will the system boot? - Is there any problems running the SSD with the OS on the optibay as far as speed and reliability? Please help me out! Really looking forward for this upgrade! Thank you. Best regards!