What other commands could I run to receive more information as to why Boot Camp Assistant won't let me create a partition to run Windows? Thanks in advance. I did reinstall mac os (Mojave) but problem not resolved. Finally i solved using this. Cannot partition internal drive to install bootcamp because of APFS/High Sierra.

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.


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.

Mac Os Mojave

Restore your backup to the APFS partition, run the Boot Camp Assistant again, and all should be well.

Boot Camp is the macOS solution for installing an alternative operating system on your Mac, letting the new OS run natively on your Mac rather than in a virtual machine. However, many macOS High Sierra users have reported trouble creating new Boot Camp partitions on the latest version of Apple's operating system. For instance, perhaps you get an error telling you that your disk doesn't have enough space, even though macOS has shown you that, indeed, there is enough.

There are a couple of reasons that this could be happening. First, you've got local snapshot backups of your Mac stored locally, rather than on your Time Machine disk. These backups are created quickly once every hour, and while activities, like downloading files or installing apps, shouldn't be affected by their presence, for some reason, Boot Camp is.

The other problem that you might run into is some kind of file system corruption. Unfortunately, the only solution for this is the wipe your Mac and either perform a fresh installation of macOS or restore from a Time Machine backup.

Here's what you can do to try to fix your problems with getting Boot Camp to work on macOS High Sierra.

How to delete local snapshots on your Mac

I've personally used this method to fix the Boot Camp problem. Unfortunately, it's a little complicated and requires the use of the macOS Terminal app, but I'm here to walk you through it.

Boot Camp Assistant Macos High Sierra

1. Open Terminal on your Mac.

2. Type sudo tmutil listlocalsnapshots / and press the Return/Enter key.

3. Enter your password and press Return/Enter. Note that when you type in your password, nothing will appear inside Terminal, but it's still working. Your local snapshots should be listed and look something like this: com.apple.TimeMachine.2018-03-21-103127. The important part of each backup is that date, which in this example is 2018-03-21-103127. You'll need the date number on the end of each backup when you go to delete them in the next step.

4. Type sudo tmutil deletelocalsnapshots 2018-03-21-103127 replacing the 2018-03-21-103127 with the date of the actual snapshot you're trying to delete and press Return/Enter.

5. Repeat Step 4 for any further snapshots you need/want to delete.

Of course, if you perform Step 2 and Terminal doesn't list any local snapshots, you're likely looking at a problem like file system corruption. In that case, you're going to need to reset your Mac.

Mac Os Sierra

How to re-install macOS

There are a couple of ways to re-install macOS on your Mac. You can either perform a clean install, after which you can begin manually re-downloading apps and files, or you can re-install macOS and restore from a backup, such as those created by Time Machine.

Questions?

If you have other questions about or problems with getting Boot Camp to work on macOS High Sierra, let us know in the comments.

macOS Catalina

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