Resizing Yosemite Partition

[PowerBook-G5]

Hello, earlier today I installed Yosemite on a 20GB partition on my main drive. That was my mistake. I now know that I need more than 20GB to run Yosemite and my applications on the partition, seeing as there is now only 150MB free. I was wondering if there was a way to resize the partition without having to reinstall Yosemite or erase the partition. Thanks!

 

[Weaselboy]

Nope... you can't resize when the partition is on the bottom there in Disk Util. You will need to kill the Yosemite partition the shrink the Mavs one up, then add a new, larger Yosemite one at the end.