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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?

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migrated from stackoverflow.com Jul 31 '12 at 8:04

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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
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3 Answers

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.

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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.

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

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