Hello, I've had my first Mac, a macbook pro retina, for about a year now. For the last several months I've had issues with constantly running out of space. I have a 250gb hard drive. I have approximately 40GB committed to parallels, 30GB in pictures, 15GB in applications, around 10-15GB movies, and system files such as the sleep image and swap files. My mac tells me I've used about 200GB, and I can't figure out how this is possible. Whenever I run a program like Disk Inventory X or OmniDiskSweeper it only accounts for 140-150GB, so it's picking up 50GB less than My Mac info. I would expect some hidden system files would be taking up space, but 50GB seems like way too much. I've searched several times through google, read a bunch of articles and forum posts with similar issues, but after trying everything recommended I cannot figure out what my problem is. Could anybody offer a suggestion on how I can figure out what's taking up the rest of my space? Thanks for any help.