I'm having a seriously confusing morning! Backstory: I have a MBP with a 1TB internal HDD. I recently put a 160GB HDD in there and created a new OS X... partition? (not on the same disk) which was then encrypted using filevault 2. If I put either disk in the machine via the SATA II connection each one boots up fine. Now onto my problem: If I connect either HDD (or a number of others that I own) to one of my 2 USB enclosures, my MBP doesn't recognise it. Seems like a hardware issue? The thing is my iMac won't recognise them either! Both computers recognise a USB flash drive. If I power off my MBP and connect one of the drives by USB, I can select it in the boot menu and it boots up, and then freezes whilst opening my default apps!! Sorry if this was really confusing to read, it was confusing to write! If anyone's got some suggestions they'd be welcome!