Recently had to revert to another drive due to problems with my 10.6.8 drive I have Mountain Lion on this drive which all seemed to work OK until the other night when I decided to install Mavericks on it. I get the spinning beachball sometimes but not every time when clicking on other drives to open them, even when I click on things like Documents or my Home directory in the Go menu. When this happens I have to reboot. Once restarted I tried to use Disk Utility, that does not work either, I opened Disk Utility and it just sat there with the spinning beachball saying it is gathering drives. Just got a new drive arrive through the post, oh well look like a new install of Mountain Lion, or do I stick with Mavericks and see what any updates bring.