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C: drive full, but folder sizes don't add up

I don’t know where all the unaccounted disk space usage is coming from on the C: drive of our Windows 2008 Server. Total folder sizes from below is only 21.4 GB out of a 39.9 GB partition – but disk is showing full (only 187 MB available) and low disk space warnings are being given in system tray.


C:\Folder - Size

Dell - 64 KB
Diskeeper - 77.7 MB
inetpub - 1 MB
Install - 75 MB
PerfLogs - 0
Program Files - 247 MB
Program Files  (x86) - 345 MB
Tech Support - 2.64 MB
Users - 378 MB
Windows - 20.3 GB
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grgar
Asked:
grgar
3 Solutions
 
John HurstBusiness Consultant (Owner)Commented:
Get a copy of TreeSize (Jam Software) and install the trial version (it is worth bying). It will show you all the file/folder useage on your server including hidden and shadow storage.

.... Thinkpads_User
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n2fcCommented:
Video on how to use it here: http://www.youtube.com/watch?v=Fm_Z_J4ZNnM
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grgarAuthor Commented:
Thanks, but I only have 187 MB of space available. The Symantec antivirus won't even update and I think it is related to that as I have seen other reports of similar problems with Symantec Endpoint Protection, but I just can't find where I can make enough space.
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John HurstBusiness Consultant (Owner)Commented:
I think Tree Size will install in that space. Have you tried?  

Also run DiskCleanup (cleanmgr) to clean up temporary files first. .... Thinkpads_User
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John HurstBusiness Consultant (Owner)Commented:
TreeSize Professional can be installed on a USB key. So do that and run from the USB key. That will tell you in a hurry. I use TreeSize myself, so I recommend it from that viewpoint.

.... Thinkpads_User
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grgarAuthor Commented:
I just got Disk Cleanup (cleanmgr.exe) setup, was wondering why that wasn't available. http://technet.microsoft.com/en-us/library/ff630161(WS.10).aspx

Thanks for the info on that first, I have it running now, but will have to finish later. I will then check out Treesize and let you know how it works out.
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macarrillo1Commented:
Did you empty the trash?
Also, you can right click on the drive and optimize.  There may also be a lot of cached and temp files that can be removed.
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John HurstBusiness Consultant (Owner)Commented:
That is what Disk Cleanup does.  .... Thinkpads_User
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arnoldCommented:
Check what your page size is set to.
Properties of computer, advanced settings, performance settings, advanced,

You might not have the paging size set to a fixed side but rather allow windows to manage it which may have it grown larger than expected. Reduce the size to 6GB and that should free 12gb after restart.
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David Johnson, CD, MVPOwnerCommented:
folders I did not see:
c:\programdata
c:\system volume information

40G is a very small partition
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grgarAuthor Commented:
Thanks all, I had tried the other solutions, but the trial of TreeSize Pro did it for me. I first got cleanmgr.exe setup and was able to free 1GB for some working room. Then TreeSize found 20GB being used by my Diskeeper Recovery Bin where I deleted 15 GB worth of old Symantec update files. I wasn't able to access my Recovery Bin, where I could have possibly deleted those files, probably due to the extremely low disk space available - but TreeSize quickly found them. Thanks Thinkpads_user, it is a great program and thanks for the video link n2fc. Good point ve3ofa, I will have to check that out; I was trying to see if any folders were hidden and they must be, but I will have to look that up for Server 2008 R2.
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John HurstBusiness Consultant (Owner)Commented:
Thank you and thanks for the update.
.... Thinkpads_User
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