After I updated from 10.10 to 10.10.1 (which I didn't have any issues with) I noticed my 512GB SSD took a huge hit and I somehow lost over 130GB of free space. I read earlier on here that someone had noticed a similar loss of space and they'd recovered it with a clean install instead of an update. I decided to try it myself and it worked! I've gone from 320+ GB after the update, to 165GB after the format and clean install w\ TM recovery for settings and documents ...Apps were redownloaded from the App Store. I just wondered if anyone else has found the Yosemite update has robbed them of space? Any thoughts on why?