Ok, I have a 2012 15" MacBook Pro and decided to install an SSD as well as the 500GB already in here, so I bought a 256GB OCZ Agility 4 SSD and an Optibay from eBay. I need Mac on the SSD, 250GB On the HDD for Mac to use and 250GB for BOOTCAMP on the HDD. HDD - Extra Space for Mac, BOOTCAMP SSD - Mac The problems I'm having are: Can't get the SSD to Boot Mac while in the Optibay (works in HDD bay) It doesn't even appear in my boot menu or startup options, I opened it in disk utility and verified and it gives an error saying the disc needs to be repaired, so I tried repairing and it just does the same thing over and over. So, I decided to try the SSD in the HDD bay, and the HDD in the Optibay, it booted in to Mac from the SSD, but I can't get bootcamp to boot at all, it says 'No Bootable device found' So I tried using disk utility and again, fails to repair. So, I'm assuming my Optibay is defective? Suppose that's what I get for buying cheap crap from eBay. Anyone know if it's just something I'm doing wrong? Or if it's a known problem? If it is defective, can anyone recommend a good quality optibay (in the UK) Thanks.