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I have a disk that says it has 15 GB of total space. If I check size of all the folders\files it is only ~5 GB. But it says I'm down to about 200 MB.

This is secondary D: drive (so not where the os is)

Any ideas where the other 10 GB are?

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Use a program like WinDirStat to figure it out. – Ramhound Nov 29 '12 at 1:27
Have you checked hidden/system files? You may have a pagefile on there. – Paul Nov 29 '12 at 1:32
Make sure that the drive is partitioned correctly. – Wyko Nov 29 '12 at 2:00
I had tried WinDirStat ... but this time I turn on "Show Unknown Spaces". That is where the space is... not sure what that means though. – llcf Nov 29 '12 at 2:05
Read this Seems like it could be system restore points. – Ryan E Sep 5 '13 at 21:54

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