Resize 'Macintosh HD" into unallocated space vacated by Bootcamp partition I have a Boot Camp partition on my MBP. When initially setting up the Boot Camp installation I set this partition to be quite large but now I wish to utilise more of that space in the Macintosh HD volume.

I've booted into Windows and used Disk Management to shrink that volume, so there's now just over 200GB of unallocated space on the drive.

I now wish to 'incorporate' this unallocated space into the Macintosh HD volume, but Disk Utility (the GUI version) doesn't allow it.

I've also tried

Terminal &gt; diskutil resizeVolume disk0s2 0

I used 0 because diskutil tells me "A size of zero will cause a grow fit-to-fill." However, this command responds with "Volume format does not support resizing" and while that response might be very clear to someone else, I'm not sure what it's telling me. Is it because the unallocated space was previously formatted as NTFS?

Am I doing this the wrong way? Do I just need to tweak my Terminal command? What is the correct way to extend my current Macintosh HD volume into that unallocated space?
Change partition size only with Bootcamp Assistant.