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Phantom Disk Usage

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I have a 80GB physical drive partitioned into two logical drives – 20GB and 60GB. My 60GB drive has only 17GB of data on it (counting hidden and system files). However, XP thinks the drive is full (only 1% free space). I don’t have a pagefile on this drive (its only a data drive) and can’t think of anything else that would be hogging the space. I’m running Norton Pro 2003 and it hasn’t found a virus. Anyone have a suggestion???

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see if this mskb article helps any:
315688 How to Locate and Correct Disk Space Problems on NTFS Volumes in Windows XP
search by article number at support.microsoft.com

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Another possibility (although remote) is a little-known “feature” of the NTFS disk formatting known as Alternate Data Streams.
You can hide files in an alternate data stream, and those files will NOT be listed in at all, but they take up drive space.
Read here for details:
http://patriot.net/~carvdawg/docs/dark_side.html

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I have run into this on NT4 machines, I reinstalled the service pack to fix the problem.

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