Boot Camp Assistant helps you install Windows on your Mac. The installation process depends on your Mac model. MacOS High Sierra. Select version. See alsoConfigure your Mac in Windows using Boot Camp Remove Windows from your Mac using Boot Camp Troubleshoot Boot Camp Assistant problems on Mac Apple Support website: Boot Camp Support. Both of the boot managers available to use can handle the dual-booting process; they can even handle more than two OSes, but the Mac's boot manager won’t recognize the Ubuntu OS without a bit of fiddling, and the GRUB boot manager isn't particularly easy to use.
- Start up your Mac in Windows or macOS with Boot Camp. 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.
- High Sierra Problems: How to Fix the Most Common macOS Issues. 233.8K views. If things go disastrously wrong at least you’ll be able to boot from macOS’ Recovery partition and migrate all your data back to your Mac. You can use any backup tool you like – Apple obviously favours Time Machine, but you don’t have to use it.
- Troubleshoot Boot Camp Assistant problems on Mac. Here are some Apple Support articles that might help you troubleshoot Boot Camp on your Mac: Install Windows 10 on your Mac with Boot Camp Assistant. If the Boot Camp installer doesn’t open after using Boot Camp Assistant. Switch between Windows and macOS.
Tips
By Mike Wuerthele
Monday, January 29, 2018, 12:09 pm PT (03:09 pm ET)
Boot Camp will add a partition on-the-fly to your system drive, but there are some things that can stand in the way of that process. AppleInsider explains how to fix most of the issues preventing you from setting up that partition, if the assistant throws you the failure to partition error.Monday, January 29, 2018, 12:09 pm PT (03:09 pm ET)
Pre-step. Get a backup with something other than Time Machine. For this task, we recommend Carbon Copy Cloner, SuperDuper, or ChronoSync to make a fully bootable, fully clone-able backup volume.
We've spoken about Carbon Copy Cloner and ChronoSync in the past. Before we go any further, it might be worth taking a look again.
Disable FileVault
FileVault can, in some cases interfere with the partitioning process. Why, we're not sure, but the best and least destructive, way around it is to turn off Filevault, if it is on. If it isn't, then go to the next step.
Select System Preferences, and click Security and Privacy.
Click on the FileVault tab. Unlock the pane, validate your credentials, and click Turn Off FileVault.
This isn't an immediate process. Decryption of your drive happens when the Mac is awake and plugged in. So, either use your Mac for a few hours doing things other than making a Boot Camp partition, or tell your Mac to never sleep in the Energy Saver control panel and walk away for a while.
Turn off Time Machine, un-associate any backup drives
You've got a backup, right? Don't proceed any further unless you have a backup that doesn't depend on Time Machine.
First, disassociate any backup drives with Time Machine. Select System Preferences, and click Time Machine.
Click Select Disk
Click on the drive being used as your Time Machine backup, and click Remove Disk. The Mac will pop up a dialog asking you to confirm that you want to do so.
Try to use Boot Camp assistant to partition the drive again. Should it still fail, you may need to remove Time Machine local snapshots as well.
Purge Time Machine local snapshots
For the tech saavy, the procedure to do this is different in High Sierra than it used to be. Apple killed a one-step, easy, Terminal process to turn off the feature, and automatically delete all local snapshots.
The procedure is still in the Terminal, though. Open the Terminal.
Enter tmutil thinlocalsnapshots / 9999999999999999
Depending on how many you have, and the speed of your drive, it may take a few moments to eradicate all the snapshots.
The above steps deal with most of the obstacles to a successful Boot Camp Assistant partitioning of your system drive. Once more, try to use Boot Camp Assistant to make the partition.
If all that still doesn't allow the partition to be created, then...
Format your hard drive
If you've gotten this far, we're pretty confident of your ability to do this step. First, make sure you have a backup! Reformat your drive either by booting from your restore clone, or rebooting in recovery mode, and set up an APFS partition for your macOS install, and a macOS Extended (journaled) partition for what will become your Boot Camp partition later in the process.
Restore your backup to the APFS partition, run the Boot Camp Assistant again, and all should be well.
How to start up in macOS from Windows
- From the notification area on the right side of the Windows taskbar, click to show hidden icons.
- Click the Boot Camp icon .
- From the menu shown, choose Restart in macOS.
If you haven't installed the latest Boot Camp updates, you might get the message ”Could not locate the OS X boot volume.'
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Or use Startup Manager as your Mac starts up:
- Restart your Mac from the Start menu in Windows.
- Press and hold the Option (or Alt) ⌥ key as your Mac begins to restart.
- Select your Mac startup volume (Macintosh HD) in the Startup Manager window, then press Return or click the up arrow:
How to start up in Windows from macOS
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- Use Startup Manager to choose your Windows (Boot Camp) volume during startup.
- Or select your Boot Camp volume in Startup Disk preferences, then restart.
Learn more
- If you're having difficulty using VoiceOver or another screen reader to complete these steps, please contact Apple Support.
- Learn how to install Windows 10 on your Mac.