I know this might not be the best spot to post this, but I thought I would start here and see what members would say. I run a stand alone WIN 10 volume on my Mac Pro. Last night I logged in to update a couple of games and WIN 10 had some updates as well. Everything looked great and when finished I used bootcamp to reboot into my main OS X volume. Today when I went to revisit the WIN 10 volume, it was no longer available from the Bootchamp icon, and it was then I noticed the WIN10 volume was not mounted. I tried using Disc Utility, and while the HDD was available, the WIN10 volume was grayed out and could not be mounted or repaired. I check to see if there was a problem with Paragon NTFS install and it looked great. I tried pulling my OS X volumes from the Mac Pro to see if I could force boot the WIN10 volume... no success. So, thinking outside the box, I installed Turexa Disk Manager with a 15 day trial period to see if I could mount/repair the WIN 10 volume. It worked. Tuerxa was able to repair and then mount the WIN 10 volume. Subsequently, I was able to boot the WIN 10 volume. It looks like the night before, there was a major Windows 10 update which wanted to basically entirely replace my previous Windows 10 install, ending up with a 20GB windows.old folder. I may have interrupted that install the night before by booting into OS X, leaving the volume in a state which could not mount. It's took about 2 hours for the Windows 10 update to run thru all of it's restarts and now everything looks good. I have been able to boot back and forth between OS X and WIN 10 a couple of times without issue. It's worth noting, once Turexa had installed it's own driver(s) when installing and restarting the Mac Pro, Disc Utility could then repair or mount the WIN10 volume, but I let Turexa do the repair and mount. So, it got me to thinking... The Turexa Disk Manager may have saved me a seriously time consuming alternative. But I wondered if any of our Mac users who work or play a lot under Windows, have a preference software for being able to manage some Windows disk management while under OS X? Honestly, I'd love if there was an OS X app which could clone a Windows volume, but maybe that's beyond the possible.