![]() ![]() I believe this is because macOS is using the supposed “free” space on the disk to store local Time Machine snapshots, and thus the “free space” in the container is not actually free. This rather obtuse error actually means that the Time Machine snapshots on the primary macOS partition need to be deleted. In trying to add the partition, however, Disk Utility may report that “This container can’t be split, because the resulting containers would be too small.” In this case, the + (plus) or – (minus) buttons to add and remove partitions in Disk Utility will be grayed out. In Disk Utility, select the Apple SSD physical disk, and click the Partition button at the top of the tool bar to open the pie chart, and Click the + button to add a partition. Disk Utility in macOS can do this losslessly, by shrinking the primary APFS container. The first step is to add a new partition, right in front of the Window partition. On a standard Boot Camp setup, there are three major partitions - the first is the APFS container containing all the Mac volumes, the second is the Windows NTFS partition, and the third is the Windows recovery partition. Re-absorb the remaining free space back into the main APFS container.Reboot into Boot Camp and use a Windows partition manager to claim most of the free unformatted space.Delete the partition in macOS and leave unformatted free space in its place.This partition should exist adjacent to the Windows partition. Add a new partition (note: not a new APFS volume, but a new partition / APFS container) with a slightly larger size than the desired amount of space to be added to Boot Camp, via Disk Utility, which will losslessly shrink the AFPS macOS container to do so.Keep full backups via Winclone and Time Machine in case something goes wrong! General concept Sorry, but again, this is what worked for me, and is no guarantee that it would work for anyone else. I am not responsible for any damage that may result if anyone follows my notes. Changing disk partitions across two operating systems always has the risk of seriously damaging partition maps and rendering data irretrievable. There is no guarantee this works for other models of MacBooks or OS versions. These are notes that I took to ensure that I can replicate the procedure next time.ĭISCLAIMER: this is what worked for me, on my EFI-based MacBook Pro. It is possible, and actually, quite straightforward to resize the Boot Camp partition on macOS 12.6, even with an encrypted AFPS system volume, with minimal third party tools. There is a lot of conflicting or outdated information about this procedure, including some which assert that it was impossible. Report back on how it goes for you or if you run into problems.In short, I needed to grant about 100 GB of extra space to my Bootcamp Windows partition from my Mac partition, without erasing and reinstalling Windows, on macOS 12.6 Monterey running on a 2019 Intel MacBook Pro. You are very lucky you made a backup or everything you had on your system would be gone forever. When you installed Windows last time, you deleted and/or formatted every partition on your Mac and erased everything. When installing Windows, you should only format the partition labeled “Bootcamp” and should not need to create or delete any partitions yourself. The Boot Camp installer will create the Bootcamp partition for you. If you wish to install Boot Camp again, follow the instructions for doing so here: Your Mac will be just as good as new when you’re finished. This will be when you connect your Time Machine backup drive and import your backup. Later in the install process, you will be prompted to transfer your information. You must delete all partitions on your disk and create one partition that fills the entire disk using APFS format. If you need to connect by WiFi, the system will prompt you for the network name and password first.Įven with a fast Internet connection, your Mac might take a LONG time to start, so be patient.Ĥ) Follow the instructions on this page beginning with step 2:īe sure to click through the link in that step about erasing your disk. If you are connected to the Internet by wire, you will see a large spinning globe icon appear on your screen. If you are able to plug your Mac into a wired network, do so WiFi will work, but will be much slower.ģ) Power on your Mac and immediately hold the Opt+Cmd+R keys. You will be destroying your Windows install.Ģ) Shut down your Mac. You will need to start your Mac using Internet Recovery to reinstall macOS and restore your backup.ġ) If you have any files you need to back up in Windows, do this first. From your screenshot, it looks like you also formatted your Recovery partition. ![]()
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