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  

DISKPART shows:

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?