Fusion Drive lost space after bootcamp-fail. resizeStack throws an error. What can I do? I have a 2 TB Fusion Drive in a 5K iMac (Late 2015). Two days ago, I started the bootcamp assistant to create a partition for Windows 10. It got stuck (let it run 30 minutes), however, which forced me to reboot the machine. After booting, I lost 164 GB from my Fusion Drive.

I googled and found a solution, which states to boot into recovery and run diskutil cs resizeStack &lt;LGVID&gt; 0g, which I did. However, I am not able to let it resize, because it immediately throws an error. Following the error does not work either.

I also tried repairing the disk with Disk Utility which runs for a few minutes, then says everything's fine. Nothing changed of course.



Output of gpt -r show /dev/disk0:


Output of diskutil verifyDisk disk0:


What can I do now?
Since I wasn't able to resize the stack and seemingly no one was able to help me, I decided to to this:


Make an image of the Fusion Drive Volume and save it onto an external hard drive
Delete the Fusion Drive
Rebuild the Fusion Drive
Install OS X to let it create the Recovery partition
Boot OS X, run Bootcamp Assistant
Run the Windows Installer WITH NO EXTERNAL DRIVES ATTACHED (!)
Restore the image to the Fusion Drive
Be happy after 10 hours of work


Not the best procedure to do but as this was the only thing that seemed to help, I did it.

For recreating the Fusion Drive I used this answer from klanomath:
https://apple.stackexchange.com/a/168744/109455

I have a working setup with OS X El Capitan and Windows 10 now.