Low Disk Space on Server2008R2

What's the best way to track down the culprit of what's eating up my disk space? I have two servers that are dangerously low on C: and I want to get to the bottom of this.
nflynn85Asked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Use TreeSize or WindirStat - ideally run them from the System Account (use PSEXEC to do that) but you can probably run them from the administrator account and get your answer most of the time.
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JohnBusiness Consultant (Owner)Commented:
+1 for Tree Size. I use this and it is one of the best to root out space usage.
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JohnBusiness Consultant (Owner)Commented:
You should not muck with winsxs. On systems newer than 2008, Disk Cleanup will clean it up properly. But do not delete it on your own. Find other places to save space or you may need to provide more space.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
How large is your C: drive?  How large is your Hard Drive?
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nflynn85Author Commented:
John I don't see why you "shouldn't muck" with the winsxs, when MSFT has provided a KB for a way to resolve the issue when that particular folder is too large and needs to be cleaned up - https://support.microsoft.com/en-us/kb/2852386

Lee that particular drive is 30GB - this server is a VM in hyper-v and the drive is a .vhdx
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JohnBusiness Consultant (Owner)Commented:
30GB is way too small for anything but a bare bones server that doesn't do much.

The article points to Disk Cleanup which I pointed you to earlier.

Disk Cleanup reduces winsxs on Windows 8 and 10 and Server 2012. It does not do anything practical on Windows 7. I am not sure about Server 2008.

If Disk Cleanup works, that is how you should reduce winsxs.

My remark above was only for manual cleanup (deletion) of winsxs which I would not do (and do not recommend).
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nflynn85Author Commented:
It is a bare bones server that does not do much :) It's a "compute" server for an application we have but doesn't need a ton of power to do what it needs to do.

The article I posted above points to disk cleanup for 2008 via an update to reduce winsxs

Thanks for the clarification
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JohnBusiness Consultant (Owner)Commented:
Try the article (Disk Cleanup) and see if it works.
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nflynn85Author Commented:
Disk Cleanup got me about 8gigs back on the 2008 server

The other server is running Windows Server Enterprise without Hyper-V, disk cleanup didn't pick up the directories for cleanup like the previous one did.

In both instances, my predecessor configured C and D on the same disk0 so I can expand D but cannot expand C without deleting D

Any thoughts on how to proceed?
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nflynn85Author Commented:
Using the WinDirStat pointed me to the real culprit - the winsxs folder.

I chose my answer as the best because not only did it outline what the real culprit was, but I also linked to how to resolve an issue when your winsxs folder is too large and needs to be cleaned up, nobody else provided that nor seemed to read it nor did they seem to know that it was possible to clean that up with an update from msft
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