Hi, I have fairly new macbook with OS X 10.9.5 and 120.47 Gb of storage. Ever since I've had it I've been struggling to explain what's been accounting for at least 20 Gb of the storage. In the "about this mac->more info->storage" section I see the following breakdown... 7.63 Gb - Audio 12.73 Gb - Movies 3.46 Gb - Photos 12.18 Gb - Apps 0 Gb - Backups 82.4 Gb - Other (118.4 Gb - leaving me with a couple of Gb free at the moment). I then contrast that with the size of the folders in "Macintosh HD"... 31.35 Gb - Users 27.41 Gb - Applications 12.4 Gb - Library 5.87 Gb - System (total of 77.03 Gb) I have a couple of questions that I can't answer that I'm really hoping someone can help me with... 1) where is the missing 40 Gb in terms of what I can see associated to my one (and only) hard drive? Surely the OS isn't 40 Gb? 2) when I look inside the 31.35 Gb Users folder - it contains 1 user, that contains a Documents folder which is 13.43 Gb (correctly), and then just a bunch of folders a few Megabytes big (e.g. Pictures, Desktop, Downloads etc). So there's almost 20 Gb missing from the Users folder alone. I've tried using various storage analyser software but they haven't helped identify the cause of these 2 discrepancies. Any ideas at all would be hugely appreciated because I'm continuously running out of space at the moment. Thanks, Dan.