So... I've been working on this for about a half a day now, with zero success. The goals: 1.) Have OS X on my 500GB Samsung SSD over Thunderbolt (goal met, with zero trouble). 2.) Turn the 120GB internal SSD into a Windows 8 partition exclusively. 3.) Partition the 3TB internal HDD into a Games for Windows/Photo-work for OS X drive. This all revolves around Windows 8. Here's the situation. If I leave the 3.1TB Fusion Drive intact, I can install Boot Camp with NO issues at all via the Boot Camp assistant - which of course means Windows does not go on the SSD... If I split the 3TB Fusion Drive from Terminal and end up with a 3TB Disk and a 120GB SSD as intended, there's no way for me to install Windows on the SSD. I get an easily repeatable error, as seen below: "We couldn't create a new partition or locate an existing one. For more information see, the Setup log files." OK, so then I had an idea... What if I re-fuse the 3.1TB disk, use Boot Camp to partition the disk - which I knew workes, get Windows 8 successfully installed on the BOOT CAMP partition, use WinClone to make an image of Windows 8 immediately, THEN un-fuse the 3.1TB disk, and use WinClone to put the Windows 8 image back on the 120GB SSD! Genius! So, I did that and it works to boot to Windows! But.... then I end up with the 3TB Disk not visible in Windows at all, showing an AHCI/SATA driver error which is NOT resolvable through re-installation. You can see the driver error in the picture below, too. So then I had another idea. What if I RE-FUSE the 3.1TB disk, run Boot Camp assistant to partition the disk as I need it, then UNFUSE the volume. This left me with the 120GB SSD, and then the 3TB disk partitioned as BOOTCAMP and Macintosh HD 2. Perfect. Now, use WinClone to restore the Windows 8 image to the 120GB, and boot to Windows 8. Yes, it works! NO driver error, and the 3TB disk (both OS X and Windows partitions visible!). So everything looks great, finally. HOWEVER, I then rebooted to OS X. And then, without touching anything, rebooted back to Windows. The 3TB disk is now missing, and the "driver" issue is back in Device Manager. I can repeat this procedure over and over, but the 3TB disk always goes missing after a reboot to OS X and then back to Windows. So I'm at a complete loss. Does anyone have any suggestions about what to do here? I had this very setup running PERFECTLY for 2 years on my 2012 iMac, without having to use WinClone or anything... All help appreciated.