Question : DiskPart failed to extend the volume. Basic Disk, Primary Partition

I have a Windows 2000 Sp4 Server, HP Hardware and RAID controller. The server is in Terminal Services Application Mode. The server runs Citrix and its drives have been remapped to M and N from C and D. The server has a hardware Raid 5 array, which I have extended the space on using HP Array Management. In Windows Disk Management I  now see the Unallocated Space to the right of the N Partition. The  disk I want to extend is a basic disk and the partition to be extended, N, is primary and not system.

This seems seems like the text book situation for diskpart, but  I am erroring out. The transcript of my interface with diskpart is below. Note I also tried it with Volume instead of Partition and got the same result. Any ideas?

DISKPART> List disk

  Disk ###  Status      Size     Free     Dyn  Gpt
  --------  ----------  -------  -------  ---  ---
  Disk 0    Online       136 GB    68 GB

DISKPART> select disk 0

Disk 0 is now the selected disk.

DISKPART> list part

  Partition ###  Type              Size     Offset
  -------------  ----------------  -------  -------
  Partition 1    OEM                 36 MB    16 KB
  Partition 2    Primary           8029 MB    36 MB
  Partition 3    Primary             60 GB  8064 MB


DISKPART> SELECT PART 3

Partition 3 is now the selected partition.

DISKPART> EXTEND

DiskPart failed to extend the volume.
Please make sure the volume is valid for extending.

Answer : DiskPart failed to extend the volume. Basic Disk, Primary Partition

I've had the odd problem with diskpart myself in the past. Use this tool: http://gparted.sourceforge.net/ - it has the necessary network and RAID drivers for common hardware.

Its free and it works (always nice words to hear used together). But, as always when manipulating disc partitions, make sure you have a good backup first.