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How much hard drive space should be left open on a MS Windows server 2008 r2?

I have a client who has a DELL server running Windows Server 2008 R2 with 4 GB RAM. The Hard drive is 40 GB and has 1.41 GB available. How 'bad' is this? What is the 'minimum' space that should be kept and what are the problems that can and/or are occurring due to this small space left ?

Thanks in advance.
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Don S.
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the server is also generating memory errors. Would this be attributed to the low hdd space?
Disk space is cheap, 40GB is way out of line for total size.. for a DC only I'd estimate 100GB minimum 250GB preferred. A barebones DC clean install requires almost 20GB.. You start adding user profiles onto this system and the disk space requirements increase dramatically. 3% free is way, way under the guidelines of having 30% free. To get to 30% free you need 50GB so even an 60GB/80GB OS disk is a little more reasonable.

With only 4G of ram you will have a lot of swapping (unless only acting as a headless DC) and your pagefile is going to be extremely fragmented which will result in lower performance