Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I'm baffled. My C: Drive is showing up as almost full at 127GB out of a 138GB hard drive capacity. However, when I add up all the folders, they only add up to 73GB.

That's a whole whopping 54GB that's been eaten up by something I don't know about. I understand that temporary files can eat up space, but not 54GB, right? Where did the space go?

I've searched Google for solutions and a common culprit seems to be Adobe Media Cache files, but I don't seem to have a folder like this.

How do I figure out where the space has gone and free it up?

share|improve this question

migrated from Jul 31 '12 at 8:04

This question came from our site for professional and enthusiast programmers.

What @Shahzeb said, but: if you click start and type "disk cleanup", this may help reclaim some of your space. – Dan Puzey Jul 31 '12 at 7:17
System Restore doesn't show up used space when you tally the folders, due to permissions. Use an app like SequoiaView to establish exactly where it all went. – user3463 Jul 31 '12 at 8:15
Perform a chkdsk (Properties / Tools / Error checking), and note the number of clusters-in-use and bad blocks. If any lost clusters were recovered, then add up your sizes again. Are you sure you are counting hidden files and folders? @RandolphWest - the disk space used by System Restore files should be constrained to just a few percent of total space, unless that limit was mucked with. – sawdust Jul 31 '12 at 8:38
Agreed. 12% is the default. There's also a long list of files that won't be counted, depending on permissions. OP hasn't indicated whether she looked for system files like hiberfil.sys and page file, so we are guessing anyway. – user3463 Jul 31 '12 at 8:41

Windows typically reserves some space for swapping, and also for system restore. Go to system properties (e.g. right click "my computer") and check virtual memory under Advanced->Performance settings, and system restore space under the System restore tab.

share|improve this answer

Maybe, you added up all folders, excluding those that are hidden or system? Enable the viewing of hidden folders Control Panel->Appearance and Personalization->Hidden files and folders->Remove the checkmark from the checkbox labeled Hide protected operating system files-> Press OK.

share|improve this answer

Use an utility like foldersize to get detailed count of your disk usage

share|improve this answer

You must log in to answer this question.

protected by Community May 30 '13 at 18:32

Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).

Would you like to answer one of these unanswered questions instead?