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available space on drive not matching total size of all the folders

I have a strange issue. One of my windows 2003 x64 servers has a 273GB RAID 1 volume that is partitioned to host an OS partition (C: drive) and App partition (D: drive). The OS partition (C: drive) is 30GB and the App partition (D: drive) is 243GB.

According to windows, D: drive has 25.3GB free however when I select all folders (hidden files and protected system files) and check file size, it only shows using up 9GB. I am not sure how to identify where the additional 209GB is being used. Any idea how I can troubleshoot this?

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noufs

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mmsitech

I have seen where the combined sizes of the root folders on a drive don't equal the total size of the space used on a drive.

I'm not sure why this is... but I've had that problem too... I was able to get the size of each of the root folders individually by right-clicking them and going to properties and viewing the size there. Then I found out which one was the space hog and drilled down into that folder and found the sizes of those folders and so-on until I found the container where all the large files were living.

Silverfuel

ASKER

Treesize free is a good one. I used windirstat and that wasn't able to pinpoint the file/folder that was taking up all the space. In my case it turns out to be System Volume Information. Now I need to figure out what is going on there but that will be straightforward.