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What file is eating up disk space?

Back in October 2010, I notice after installing server software, Exchange 2010, and user e-mail, drive C had 63 GB of free disk space.  Drive D had 373 GB of free disk space.

Now in May 2011, drive C has 47 GB of free disk space, drive D has 363 GB of free disk space.

I am trying to determine what file has added 16 GB of data to the C drive.  What should I do next?

Thanks for your help.

1 Solution
Adam BrownSr Solutions ArchitectCommented:
Download and install Windirstat: http://windirstat.info/
It'll give you a good idea what is going on. More than likely, though, the space is being used by the Transaction Logs. More info on those here: http://www.msexchange.org/articles/Transaction-Logs-Lifeblood-Exchange.html
Suliman Abu KharroubIT Consultant Commented:
also Jdesk report will give you a graph of space :

Check the number and size of you transaction logs, If you have not done a full backup of the Exchange Server these logs will fill the disk, the logs are cleared during a full backup. THe Default location of the logs is the same directory as the database file.
Mayb there are many files that are doing this. I think some of then could be updates from MX, maybe server and exchanges updates.

There is a folder in windows called winsxs that in general used a lot of space, this folder can not be deleted and store differents versions dll for compatibility.

It's difficult to trace if a file has increment the space used in x Gb. But what you can do is use a tool like http://windirstat.sourceforge.net/ to view space used by bigger files.
Leon FesterSenior Solutions ArchitectCommented:
I use treesize for age- and size analysis of files/folders
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