Hi, I have a Macbook Air mid 2012 8GB with 128 Gb SSD and it's a good able system that has served me well. I'm a participant in the OSX public beta test. To manage space I just store programs and some media. On average I have between 10 -20 Gb free space. But lately I have removed multiple programs and have free space of between 6-10 GB then it just seems to disappear and I'm constantly seeing lack of space error messages when I know I am using less storage then before. A couple of days I installed the latest OSX update and i had 9GB free, then yesterday i am back to seeing no storage space! Is OSX misreading or just eating up everything I've got deliberately?!