I'm trying to shrink my Yosemite partition and create a new one.
Trouble is that the Disk Utility gets stuck "Preparing to partition disk" (same thing when run in recovery), and diskutil in a recovery terminal freezes the moment I enter the diskutil command.
I've read the diskutil manual, done Google searches, and tried the various solutions (such as verify disk).
What should I do?
If you need more info, let me.
(I have a Boot Camp partition with Windows 10).