I am unable to shrink my macOS volume/disk on my Intel 2019 15" MBP with a 1Tb disk to make space (128gb) for installing a linux distro in dual boot configuration.
Disk utility in macOS will not let me change anything in relation to disk size and it appears my macOS install is already taking up the full amount of space in the drive.
I had previously used Bootcamp to install windows 10/11 in a dual boot config, but i subsequently removed windows using Bootcamp and reclaimed the space.
I have disabled File Vault and also ran FirstAid on my disk and it reports no errors.
Within Disk Utility I see this message in relation to my disk:
This container has 373.14 GB used space. Its minimum size is 1 TB. Snapshot tidemarks can raise the minimum size above the used size. This container can’t be split because the resulting containers would be too small.
If I hold down command a little circle appears at the top of the line shown in the screen shot below, and I should be able to drag this to change the size of my disk but nothing happens when i do.
I have tried holding command at boot and using disk utility outside of macOS but i get the same thing.
As you can see from the screen shot I am using less than 400gb of a 1tb disk so I think I should be able to shrink the disk by 128gb without any probs.
I also tried resizing my macOS install partition using the Debian 12 installer but that errored out saying it was unable to modify the disk.
I thought I would see if I could use bootcamp to recreate a partition for a windows install and then use that for linux, but when i try to run bootcamp I get:
Any suggestions will be much appreciated, thank you.
