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I have a 1TB partition mounted with all my local non-program data in it, and it was showing as only having <250 GB of space left.

Media drive info

So I went to do what I usually do, move the worst of it onto my NAS as an archive, delete anything that I don't want any more, so with thi in mind I fired up windirstat - this however only showed me as having >300GB in use. This doesn't seem right - I thought maybe windirstat wasn't looking in some folders, so I selected everything in the root of the drive and hit properties:

enter image description here

What is going on here? How do I reclaim this space? I need to reclaim some of this space soon as I'm about to junk an old 750GB usb drive which is looking a bit suspicious and want to dump most of its contents on my pc while I look for its replacement...

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migrated from Nov 24 '13 at 18:53

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Are volume shadow copies enabled? They can claim a lot of storage space and don't show up in the directory stats. – David Foerster Nov 24 '13 at 18:56
just scanned your question. try treesize by jam to view how space is used – barlop Nov 24 '13 at 19:00
@DavidFoerster Not quite sure how to confirm, but the best I could do was check system/system protection, which shows as off (I use norton to back up to my NAS) – theheadofabroom Nov 24 '13 at 19:21
@barlop I already use windirstat to do the same, as mentioned in the question. The problem is that only half of the used disk space is showing up – theheadofabroom Nov 24 '13 at 19:22
@DavidFoerster ok so as a belt-and-braces exercise I followed the instructions on sevenforums and made sure any shadow copies for M: were deleted - still no more space... – theheadofabroom Nov 24 '13 at 19:33

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