A couple of weeks ago I took it out of the office and when I brought it back I was unable to boot. To cut a long story short, the Startup disk is showing as missing. I tried all the trouble shooting and seem to be unable to identify and fix the problem. I was able to download the OS X on my external hard drive so I can operate the Mac now. Jun 05, 2019 Problem: Boot Camp Control panel on Windows 10 doesn’t display macOS drive/partition which you could select to boot into. Cause: The Boot Camp utility is not able to. Therefore macOS partition won’t show in Boot Camp Control Panel since High Sierra. To set macOS as default, use the Startup Disk preference pane in macOS System Preferences, or hold control as you select the disk.
- Boot Camp Startup Mac
- Mac Startup Disk Boot Camp Missing Key
- Mac Startup Disk Boot Camp Missing Windows 10
- Disk Boot Failure
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Installing Windows on Mac via Boot Camp is usually a straight forward process. Apple has created a Boot Camp Assistant app in macOS that guides users through the complete process. Even though the steps are simple, sometimes Boot Camp gives an odd error with disk partitions that is confusing to figure out. Here is how you can easily fix it.
Fixing Boot Camp startup disk issue
- Jul 21, 2017 Hello, My dad installed Windows 10 on my mac using boot camp as I understood. When I try to log in to Macos or see if it is there it seems to be gone when I turn the computer on, there is only option to choose Windows, when I select option of restarting the in Macos it says that it 'Could not allocate the OS X boot volume'.
- Restart in OS X from Boot Camp If you have started up your Mac in Windows using Boot Camp, you can use the Boot Camp system tray to switch your startup disk default back to OS X. In Windows, click the Boot Camp icon.
The issue usually occurs if Windows installation fails and Boot Camp Assistant is unable to restore the partitions in their original state. If you get the below message, you know you’re facing this same issue:
The startup disk cannot be partitioned or restored to a single partition.
The startup disk must be formatted as as single Mac OS Extended (Journaled) volume or already partitioned by Boot Camp Assistant for installing Windows.
This issue can happen due to either of the following reasons:
Boot Camp Startup Mac
- FileVault – you can disable it from System Preferences > Security & Privacy
- Time Machine – this can be disabled from System Preferences > Time Machine
- Failed Windows installation via Boot Camp Assistant
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In either of these issues, you will have to remove the partition and retry installation. Your first reaction might be to delete the new Boot Camp partition so that you can restart the installation process. However, when you go to Disk Utility to try and delete the Boot Camp partition, you will notice that the (-) isn’t active anymore. You get the below message:
You can not remove this volume because the previous volume can not be resized.
Mac Startup Disk Boot Camp Missing Windows 10
While this seems kind of an odd situation to be in, the solution is pretty simple. You do not need to open up Terminal and use Diskutil, just follow these steps:
Disk Boot Failure
- In Disk Utility, you will notice that there is an 8 GB partition next to the Boot Camp volume. This volume is called OSXRESERVED. Select it, and click the minus button.
- Once it’s removed, click on the BOOTCAMP volume and you will see that the minus button is active again. Click it to remove the volume.
You should now be able to restart Windows installation using Boot Camp Assistant.
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P.S. OSXRESERVED is created just for the Boot Camp installation process and is removed by macOS after Windows is installed. If, somehow, you still see it after installing Windows, you can follow the above steps to remove it and recover 8 GB storage space.