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aidanpendragon

macrumors 6502a
Original poster
Jul 26, 2005
928
8
Running Mojave 10.14.6 on a late 2015 27" imac. Had previously installed Windows 10 under Boot Camp under a previous OS X build (El Capitan?) in the HFS+ days. Subsequently upgraded to High Sierra and then Mojave. I haven't booted into Windows via Boot Camp for ~2 years but did so the other day. When I went to reboot into OS X--by restarting and holding the option/alt key--only the Windows volume (NTFS) appeared; no OS X volume appeared.

Fortunately, I have a very recent external bootable backup and used that to boot into OS X via holding option/alt. My OS X volume now does not appear on my desktop (but my Bootcamp partition still does!). When I go into Disk Utility, what I suspect is my partition appears as "APFS Physical Store" (under the physical HDD), but is greyed out and can't be mounted or have First Aid run on it. My guess is that something in the directory was mucked up, but not sure what.

Welcome thoughts on problems and solutions. Having read a little about the problems APFS and Bootcamp have playing together, I suspect there is an issue there?

-What's the solution? Any "easy" way to fix directory issues and
remount what looks like my latent OS X partition? Using Disk Utility, DiskWarrior, or otherwise?

-What's the problem? Should booting into Boot Camp itself cause this issue? I could restore my OS X partition from my backup, but will going back to Windows just "break" it again?

Thanks.
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I created a Bootcamp partition using Bootcamp assistant, but the Windows 10 installer refused to install to that. After a dozen attempts resulting in failure. I had to resort to the WintoUSB solution.
I'm now running Windows entirely from an SSD in an external USB enclosure. (it's only USB 2.0, but still faster than an internal HDD)
If any issue happened with the Windows, I just unplug the USB enclosure an do a PRAM reset.

Could you try a PRAM reset to see if anything change?
 
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