My MacBook Pro 13" Late 2011 is running Yosemite. I am trying to install a Linux distribution on a partition of my hard drive. I used Disk Utility to resize the main partition on my hard drive and it completed seemingly successfully. I was left with the following:

enter image description here

However, as soon as the partition was created, I was left unable to rename or resize the remaining OS X partition again (all options were grryed out). Also, Disk Utility allows me to click the "+" to make a new partition, as well as name and choose the file format for the new partition, but doesn't let me resize anything (as seen below)...

enter image description here

Furthermore, when I click on "Apply", I get the log message "Preparing to partition disk: .. ", but this process then hangs and never terminates (as seen below).

enter image description here

Disk Utility also lets me click Apply again, and the same message will appear in the log again, but with no results.

If I try switching hard drives in the left pane, and clicking back to my main hard drive, it shows me that no partition was created at all.

The drive was verified and repaired boht within the OS and upon boot many times, with success each time.

What is going on here? How can I manage to fix this so that I can create a new partition, and resize them all? Is there another partition manager I can use on OS X that'll solve the problem?

  • Essentially, Disk Utility cannot handle Core Storage properly - see apple.stackexchange.com/questions/154964/…
    – Tetsujin
    Nov 13, 2014 at 7:44
  • 1
    Please add the output of diskutil list and diskutil cs list as well as sudo gpt -r show disk0 executed in Terminal to your question.
    – klanomath
    Nov 13, 2014 at 12:01

1 Answer 1


I had the same problem as you, and i searched all the forums and i found that if you turn off FileVault it should work.

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