I can't change size of partition
MacBook Air, OS X Yosemite (10.10.5)
Hi InFocusRx,
Welcome to the Apple Support Communities! I'm sorry to hear you are having these issues with your Mac. If you are trying to create or resize a partition for installing Windows under Boot Camp on your Mac, you may find the information, steps, and requirements outlined in the following article helpful:
Set up a Windows partition on your Mac - Apple Support
Regards
Are you using Bootcamp?
http://apple.stackexchange.com/questions/181868/i-cant-shrink-my-os-x-yosemite-p artition
Did you try running DU from the Recovery or bootable installer to make your changes?
I can't change size of partition