Trying to get rid of partitioned drive

[oldmanmax]

I made a partition drive about 100 Gb to install Yosemite beta. Tried getting rid of it now Yosemite is loaded on main system. In disk utility it will not let me, the +/- just stays greyed out when clicking on the partition. How can I restore drive to full capacity now? Using a macbook pro.

 

[Weaselboy]

I made a partition drive about 100 Gb to install Yosemite beta. Tried getting rid of it now Yosemite is loaded on main system. In disk utility it will not let me, the +/- just stays greyed out when clicking on the partition. How can I restore drive to full capacity now? Using a macbook pro.

Your Yosemite install turned that volume into a core storage volume that cannot be resized. Run the command below in Terminal to turn off the core storage, then you can resize normally with Disk Util.

Disconnect any other attached drives first.

diskutil cs revert /