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Boot Camp switch issue

Susja

macrumors regular
Original poster
Feb 22, 2017
124
4
I am using MBP 2015 running OS Catalina.
I installed second partition Windows 10 using Boot Camp.
The issue I have on Windows: I want to reboot into Mac not by holding Alt key but by using icon.
On Task Bar I select icon Boot Camp, click on item 'Restart in OS X...'
It pops up a message: 'Are you sure you want ... Your computer will start up using OS X..'
I click OK and got error message: 'Could not locate OS boot volume'
How could I fix it ?
Thanks
 

Susja

macrumors regular
Original poster
Feb 22, 2017
124
4
Well... I followed Apple instructions and installed Windows support software successfully. Unfortunately it did not make any difference. Widows still does not recognize OS X. msconfig-boot also does not see Mac. Hence from Mac I have a workaround to set OS from Startup Disk app but from Windows OS I don't have an option to boot into Mac. Well ... not convenient. Thanks
 

DeltaMac

macrumors G4
Jul 30, 2003
10,687
2,895
Delaware
I've done some testing on this, with two internal hard drives. One has Mojave boot system, and a second partition with Windows 10, set up through Boot Camp. The second hard drive has two boot systems, one is Catalina, and the other has a Big Sur beta system installed.
I usually boot to Catalina, and the Startup Disk is set for Catalina to be the default boot system.
Without changing any settings, I restart my Mac, holding Option, choose the BootCamp system, and it boots to Windows 10.
Now - booted to Windows. I choose restart from the Windows menu - again, without changing any settings. My Mac simply reboots to the Catalina system, as I expect.
Boot back into Windows 10.
This time, choose the taskbar, and the Boot Camp icon, choosing to "Restart in macOS..." and THIS time (again, did not change any settings), my Mac restarts to the Mojave system (which is on the same device as the Windows system)
If I boot again into Windows, then go to the Task Bar, then Boot Camp, choosing to open the Boot Camp control panel, I notice that the Startup Disk panel only shows a Boot Camp choice, and a macOS choice. After testing a couple of times, I realized that Boot Camp in Windows only sees the Mojave boot system. Of course, I can't actually browse to any of the Mac volumes. Windows won't browse to those, as they are all APFS volumes.

What's your choice here?
Set your Startup Disk while booted to your normal Mac system.
Don't change boot settings just to boot into Windows.
Restart, holding the Option key on your keyboard. Choose the bootcamp system when it appears in the boot picker screen, and use that boot to Windows.
When you want to go back to Windows, just restart from the Windows menu (not the taskbar bootcamp icon)
You don't need to do anything going from Windows back to macOS, other than a simple restart.
 
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Diegosan12346

macrumors newbie
Aug 27, 2020
5
1
I've done some testing on this, with two internal hard drives. One has Mojave boot system, and a second partition with Windows 10, set up through Boot Camp. The second hard drive has two boot systems, one is Catalina, and the other has a Big Sur beta system installed.
I usually boot to Catalina, and the Startup Disk is set for Catalina to be the default boot system.
Without changing any settings, I restart my Mac, holding Option, choose the BootCamp system, and it boots to Windows 10.
Now - booted to Windows. I choose restart from the Windows menu - again, without changing any settings. My Mac simply reboots to the Catalina system, as I expect.
Boot back into Windows 10.
This time, choose the taskbar, and the Boot Camp icon, choosing to "Restart in macOS..." and THIS time (again, did not change any settings), my Mac restarts to the Mojave system (which is on the same device as the Windows system)
If I boot again into Windows, then go to the Task Bar, then Boot Camp, choosing to open the Boot Camp control panel, I notice that the Startup Disk panel only shows a Boot Camp choice, and a macOS choice. After testing a couple of times, I realized that Boot Camp in Windows only sees the Mojave boot system. Of course, I can't actually browse to any of the Mac volumes. Windows won't browse to those, as they are all APFS volumes.

What's your choice here?
Set your Startup Disk while booted to your normal Mac system.
Don't change boot settings just to boot into Windows.
Restart, holding the Option key on your keyboard. Choose the bootcamp system when it appears in the boot picker screen, and use that boot to Windows.
When you want to go back to Windows, just restart from the Windows menu (not the taskbar bootcamp icon)
You don't need to do anything going from Windows back to macOS, other than a simple restart.
Since you seem like you know whag your talking about im trying to boot into windows i restart while im in catalina then hold my option key but it doesnt show windows drive and mac drive like it usually would it just boots me into apple
 

DeltaMac

macrumors G4
Jul 30, 2003
10,687
2,895
Delaware
Option-boot should always bring up the boot picker screen. It appears fairly early in the boot process. If you don't see the boot-picker screen and you simply boot back into your normal macOS boot system, you are likely waiting too long before you press and hold the Option key. You need to hold option as it boots, or -- if you are restarting, choose to restart, and hold the Option key immediately as that restart process begins. Let me know how it goes...
 
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