I really stupidly closed disk utility because I thought it had frozen while I was attempting to create a partition. The system is still running well except my storage says I now only have 250GB capacity, of which 95GB is free. no second partitions show up in the disk utlity so I'm therefore missing 250GB of my hard drive. I've attempted to boot into recovery mode and have repaired disk and volume. I've backed all my files up to an external hard drive and think I should just do a clean install of Yosemite (I'm running the beta) via the recovery mode? will this work? I'm worried I'm going to mess this macbook up even more so than I already have. Such a stupid decision to do this!