I recently upgraded my Windows 8.1 Pro on bootcamp to Windows 10 successfully. However when I booted back into Mac, the bootcamp partition had disappeared in the finder window. When I checked disk utility, the partition that was once named Bootcamp, is now named disk0s4!
There is also an error saying:
Error: This Disk needs to be repaired. Click Repair Disk.
I also have a boot manager installed (rEFInd), which now is bypassed when I restart the machine, however when I hold option the windows drive appears and I can boot into it!
Is this something to do with bootcamp drivers support for windows 10? Would the problem be solved by doing a clean install of windows 10 instead of upgrading?