Windows 2008 R2: can’t extend C drive, mystery partitions

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Windows 2008 R2: can’t extend C drive, mystery partitions – Managing your servers can streamline the performance of your team by allowing them to complete complex tasks faster. Plus, it can enable them to detect problems early on before they get out of hand and compromise your business. As a result, the risk of experiencing operational setbacks is drastically lower.

But the only way to make the most of your server management is to perform it correctly. And to help you do so, this article will share nine tips on improving your server management and fix some problem about windows, windows-server-2008-r2, diskmanagement, diskpart, .

I have a Windows 2008 R2 server running under VMware ESX 4.0.0. I have reallocated disk space to it in order to extend the C drive, but Disk Management has “Extend Volume” greyed out. DISKPART shows more partitions than Disk Management shows, including one after the volume I’m trying to extend, which would explain why Disk Management isn’t allowing the extension.

Disk Management shows:

System Reserved / 100MB NTFS / Healthy (System)  
(C:) / 39.39 GB NTFS / Healthy (Boot, Page File, Crash Dump)  
10.00 GB / Unallocated  


Partition 1    Dynamic Data       992 KB    31 KB  
Partition 2    Dynamic Data       100 MB  1024 KB  
Partition 3    Dynamic Data        39 GB   101 MB  
Partition 4    Dynamic Data      1024 KB    39 GB

My question at this point is: what the heck are partitions 1 and 4, where did they come from, why doesn’t Disk Management show them, and, most importantly, can I delete partition 4 in order to extend partition 3?

Solution :

A few hours later, “Extend Volume” became active. The tech that performed the extension didn’t look at the partitions before he did it, but now with the extension complete, it shows the same mystery partitions, with #4 “magically” relocated to after the extended #3.

The only thing that any of us can think of that was done to the system was run a “Rescan Disks” from Disk Management. (The space extended into was created only a few hours earlier — I probably should have mentioned that — so this might be relevant.)

If and when this happens again, I’ll try and remember to update here. If anyone can confirm or deny if they’re in the same situation, that would also be helpful.

The default partitioning layout for Windows Server 2008 R2 would be a 100 MB system partition at the beginning of the disk and one partition with the “rest”. Your other partitions of about 1 MB in size might be the result of some pre-O/S “recovery” or analysis functionality.

If you have P2V-converted this system, chances are good that these partitions belong to the management suite of the hardware you no longer use.

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