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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).

  • I've edited the tags - you might explain what OS is running to provide Disk Utility? If you start in Internet Recovery or Recovery HD, you will have better luck preventing open files from halting a resize operation. The downside is you won't have good logging if a hardware error is causing the delay / failure. – bmike Feb 23 '16 at 16:16
  • Depending on your disk config your request will probably break Boot Camp. Please add the output of diskutil list and diskutil cs list. – klanomath Feb 23 '16 at 16:22

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