Hi folks, I've been a proficient Mac user for a while now but it bugs me that I cannot figure out what's eating 130 GB of my hard drive. I checked all my files in the finder and I cannot find a single file (or a combination of files) that corresponds to the consumed disk space. I have the latest version of Yosemite and my rMBP is a late-2013 base 15-inch. Can anyone help me in pinpointing this culprit so I can delete it? Thanks in advance. UPDATE 1: I have since re-formatted and re-installed Yosemite and I reclaimed my system back including the unknown occupied space. I have to correct my earlier posts and indicate that I actually lost 160+ GB instead of 130. I have also investigated further and I noticed with my Time Machine back-up, a day before updating to the latest version of Yosemite, that I had the whole available disk space reported, leaving me to believe that the Yosemite update might have been the culprit. I will keep an eye on this the next time I update again and report back here. I am updating the title of my thread to reflect what I found out, hoping to attract any who has encountered the same anomaly as I did. This is the first time I encountered this with any Macs I ever owned. I have always found anything occupying my hard drives in the past by simply looking under Finder and sorting by file size. UPDATE 2: My rMBP seems to run a lot snappier after the fresh install. My re-occuring problems of accessing my Time Capsule drive have also been resolved...no more waiting forever for the Time Capsule drive to appear as an available drive, no more 'drive is not available' messages either. I have always upgraded from a previous OS thinking that it can do no harm. I am now a believer of fresh installations!