First off, I hope this is in the correct place on the forum. It's a long post, but I feel everything is pertinant. It's also a copy/paste from the Apple Support forums which hasn't had any response. I have a late 2009 iMac that has been backed up with Time Machine. I recently picked up a late 2012 iMac with the 1TB Fusion drive. When I first plugged in my Time Machine drive, I was asked if I'd like to transfer my files over. I did, and everything was working fine. I was using about 800GB of my 1.12TB Fusion Drive. I recently decided to add a new partition to the Macintosh HD in order to put Windows on it. I did this through the Disk Utility. I noticed that it was taking an inordinately long time to create this partition. Finally, I realized that the Disk Utility was locked up. I was forced to reboot to fix it. I went back and tried again and I got an error stating that the drive had errors and I couldn't make a new partition. So I attempted to "repair disk". That gave me an error "Error: This disk needs to be repaired using the Recovery HD. Restart your computer, holding down the Command key and the R key until you see the Apple logo. When the OS X Utilities window appears, choose Disk Utility." So I rebooted into recovery. Recovery was absolutely no help either. It couldn't repair the drive, even though it had me erase all the data. So I downloaded 10.8.2 on my Mac Mini and made a boot disk out of my Thunderbolt drive. I booted into OS X and tried again to repair, thinking it would work since the Fusion was no longer the boot drive. No such luck. I then booted back into recovery and had recovery download and install a fresh version of 10.8.2. 2+ hours into the download/install, I get an error that says "OS X couldn't be installed because the disk Macintosh HD is damaged and can't be repaired." Ok, so as a final attempt, I had recovery use my time machine to start over. That worked, kinda. It now shows my Fusion drive as being completely filled in Disk Utility (49KB remains, only about 800 or so was used before), and Finder shows the Fusion drive as being 860GB capacity with 837GB used (discrepancy between the two sizes). I still can't repair the disk. And now my Time Machine acts like I'm working on an entirely new computer and says there's not enough room on the drive unless I format my Time Machine drive and start over. Yeah, TL;DR, but does anybody have any idea how I can get this issue resolved? I wonder if doing the TM restore from my 2009 iMac may have introduced the non-Fusion version of Disk Utilities that doesn't know how to fix my issue.