I was able to reallocate a 1TB HD from 100GB MacOS/900GB Windows to a more sane 750GB MacOS/250GB Windows.

With a few clarifications and extra steps, the instructions here worked for me for a 2019 MacBook Pro 13-inch. Do not attempt this without backups of your data!īe warned that I am no expert and put together this procedure with information from existing discussion board posts, so what worked for me may not work for you. I had backups of all of my important data in case something went terribly wrong and I was forced to re-install windows, macOS or both. Type w to save the changes and confirm with y.Run sudo gdisk disk_id replacing disk_id with the identifier from the previous step.Open terminal and run diskutil list, make note of the startup disk identifier ( /dev/disk0, /dev/disk1, etc).Boot into mac OS and install gdisk (download the.This method seemed to work, I don't know if it is correct practice but Windows does boot now. Open GParted and use it to expand the windows partition into the free space created earlier.Boot into the ubuntu live USB (hold option on boot up to select).Create an ubuntu live USB using this tutorial.Resize the logical volume with diskutil cs resizeStack LVUUID size where size is a parameter such as 80g (80 gb).Run diskutil cs list to list core storage logical volumes, and copy the Logical Volume UUID.Boot into recovery mode and open terminal.Ok, here's how I solved my problem in the end (resizing a windows 10 bootcamp partition): Shrinking the macOS partition

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