You can go back and forth between OS X and Windows on your Mac, but you can’t run both operating systems simultaneously under Boot Camp. Instead, you have to boot one operating system or the other — thus, the name Boot Camp. Restart your Mac, and hold down the Option key until icons for each operating system appear onscreen. Jul 11, 2014 All you need to do to boot straight into OS X is press and hold the “Option” button on your Mac’s keyboard as soon as you power the system on. Keep holding it, and about 10 seconds later, your Mac.
Modifying this control will update this page automatically
Boot Camp Control Panel User Guide
You can set the default operating system to either macOS or Windows. The default operating system is the one you want to use when you turn on or restart your Mac.
Set the default operating system
In Windows on your Mac, click in the right side of the taskbar, click the Boot Camp icon , then choose Boot Camp Control Panel.
If a User Account Control dialog appears, click Yes.
Select the startup disk that has the default operating system you want to use.
If you want to start up using the default operating system now, click Restart. Otherwise, click OK.
You can’t change your startup volume to an external FireWire or USB drive while you’re using Windows.
To learn how to change the default operating system using macOS, see Get started with Boot Camp.
Restart in macOS
In Windows on your Mac, do one of the following:
Restart using Startup Manager: Restart your Mac, then immediately press and hold the Option key. When the Startup Manager window appears, release the Option key, select your macOS startup disk, then press Return.
If you’re using a portable Mac with an external keyboard, make sure you press and hold the Option key on the built-in keyboard.
Restart using Boot Camp Control Panel: Click in the right side of the taskbar, click the Boot Camp icon , then choose Restart in macOS.
This also sets the default operating system to macOS.
For more information about restarting in macOS, see the Apple Support article Switch between Windows and macOS.
See alsoGet started with Boot Camp Control Panel on MacTroubleshoot Boot Camp Control Panel problems on MacApple Support article: How to select a different startup disk
I have a 2012 iMac 13,2 with a 3TB Fusion Drive. When I updated to macOS Mojave, I loss my Windows Partition. I was hoping this update would address this issue but after installing the file I still can not install Boot Camp. I was wondering if anyone had any luck after this update.
I have the same machine with the same drive, and I came to the comment thread specifically looking to see if anyone else had tried this; so thanks for your insights on this. That said, I'm afraid I'm not surprised that it didn't fix the issue for 2012 iMacs. My understanding is its a rather complicated matter, in this very specific
configuration, but here's my best attempt at a layman's interpretation of the situation: Going forward, the 2012 models are no longer going to be able to support Windows installations on hard drives which exceed 2TB, in part because Windows itself does not support boot volumes outside of the first 2TB of the hard drive on that generation of hardware -- and possibly in conjunction with bugs associated with the partitioning scheme required to accomplish the installation of Windows, within those constraints. So in previous versions of Bootcamp, it sliced up the hard drive so that it basically looks something like this ...
Windows 10 Bootable Usb
|----- MacOS Hard Drive (partition 1 of volume 1) ----- | (Windows size minus 2TB) | -- Windows (volume 2) -- | (2TB) | ---- MacOS Hard Drive (partition 2 of volume 1) ---- | (3TB)
Mac Os Drivers For Windows 10
... where the sizes indicated at the end of each line are the location on the disk at which that partition ends.
Mac Os X Mavericks Windows 10 Boot Camp Partition
At the time, I thought Apple had come up with a really slick and interesting method for solving that 2TB boundary. I guess Apple has concluded that that's not so much true anymore.