Bootcamp could not locate macOS boot volume

Discussion in 'Windows, Linux & Others on the Mac' started by bentom13, Nov 11, 2017.

  1. bentom13 macrumors member

    Nov 2, 2014
    I have a 2016 MBP with Windows 10 installed via Bootcamp.

    When i start up it normally boots straight into macOS and if i want to go into windows i just hold down the option button when turning on. HOWEVER, i have turned it on this morning to find it boots straight into windows and holding the option key does nothing.

    I have tried using bootcamp manager but this just comes up with the message "Bootcamp could not locate macOS boot volume."

    I have looked on disk management on windows and the Bootcamp partition is still there, along with the macOS partition size - but not labelled macOS???

    I have a bad feeling that it has erased my macOS partition if that is possible?

    Anyone have any ideas? Trying to contact Apple Support but been waiting forever!
  2. Shirasaki macrumors G3


    May 16, 2015
    You could try to enter recovery mode of your Mac. I don’t remember how to do it but you can search it online.
    If under recovery mode, your Mac partition is still not there and you cannot repair it, something terrible has happened.
  3. bentom13, Nov 11, 2017
    Last edited: Nov 11, 2017

    bentom13 thread starter macrumors member

    Nov 2, 2014
    It did not respond to any commands when booting (Option key, Command-R etc.) So I was unable to reselect my macOS partition to boot into, or boot into recovery mode etc. It was like a windows laptop with no trace of mac. So i tried using window commands to get into the windows boot menu. I selected the Start up repair and it booted back into macOS!

    I believe Windows cannot see the windows partition so there is still some issue moving between OS's but at least i know how to get back to macOS!

    Will update as I find more incase others have the same issue.
  4. Shirasaki macrumors G3


    May 16, 2015
    The dankest moment of this troubleshooting. No one would expect that!
    This shows how fragile apple’s boot camp system is. Hence I use a dedicated PC for everything windows.
  5. bentom13 thread starter macrumors member

    Nov 2, 2014
    The issue has been escalated to the engineering team - hopefully have a solution within 2-3 working days.
  6. Shivetya macrumors 68000

    Jan 16, 2008
    is this related to the new file system under OS X? ever since High Sierra the Bootcamp app in Windows10 cannot find the partition but holding the option key during boot I can manually select it
  7. bentom13 thread starter macrumors member

    Nov 2, 2014
    No, this isn’t the problem.

    The problem is that when I shutdown from windows and then turn it back on, it boots straight back into windows - which should not happend.

    This wouldn’t be such an issue if holding down the option key worked, but it doesn’t in this scenario like it does on a normal boot.

    Hope that makes sense?
  8. salman4uall04 macrumors newbie

    Feb 22, 2018


    Did your problem sorted out? I am having same problem and every time I switch on mac I have to press option key to go into mac. Please do let me know if you got a solution. Thanks.
  9. bentom13 thread starter macrumors member

    Nov 2, 2014
    In short no, however, the main problems seems to have gone. After shutting down in windows, I can restart in Mac OS rather than auto booting into Windows again. However, the touchbar does not seem to work so i have to restart Mac OS whenever returning to it from windows.

    Although it sounds like you have a different problem to me as when I used to switch on the Mac after being in windows it was totally unresponsive to any Mac commands, but would respond to windws commands when booting.

    Hope that makes sense.
  10. Mcmeowmers macrumors 6502

    Jun 1, 2015
    On macOS select macOS as your start up disk. Boot into windows and reopen boot camp control panel. Re select macOS as the boot up disk.
    For some reason it doesn't obey the setting and you have to reselect it.
  11. Fastrip66 macrumors newbie

    Dec 28, 2017
    Spokane, WA

    Zap pram. I had the same issue, after zapping pram 3 times my option to hold down the option key at bootup RIGHT AFTER the chime has worked since no issues for a year or more now.
    --- Post Merged, Jan 22, 2019 ---

    Select the Mac disk as the startup disk in mac system preferences so it boots to Mac by default. When You want windows reboot and immediately after the chime hold option key down and arrow to windows and hit enter.
  12. cwin, May 20, 2019
    Last edited: May 20, 2019

    cwin macrumors newbie

    May 20, 2019

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