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Unable to convert to a GPT disk

Posted on 2008-10-22
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Last Modified: 2013-12-01
Firstly here's a rundown of the hardware and software:
MS Windows 2003 Enterprise R2 SP2 on a HP DL380G3
connected to an MSA60 Storage Enclosure
5 x 750gb SATA HDD
RAID 5 - 2.8TB

Basically i need to convert the new basic disk to GPT as it is over 2TB but when i right-click on the disk in Disk Management the option 'Convert to GPT Disk' is greyed out

The command line util Diskpart is also unavailable - when i run it from the command promt i get the following error:
Microsoft DiskPart version 5.2.3790.3959
Copyright (C) 1999-2001 Microsoft Corporation.
On computer: XXXXXXXX

The disk management services could not complete the operation.

Any ideas or help would be greatly appreciated

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Question by:thomasfisher
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Expert Comment

by:noxcho
ID: 22784054
Is there any partition on this HDD? Is it basic or dynamic?
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Author Comment

by:thomasfisher
ID: 22791203
It's a basic disk and there are no partitions on it, 2.8TB of unallocated space
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LVL 47

Expert Comment

by:noxcho
ID: 22796119
Try to Initialize the new disk later by using the Initialize Disk option in the Disk Management console.
There are rules for adding new drives:
After installing a new raw disk, open the Disk Management console to launch a wizard that you can use to configure the new disk. The wizard includes options to initialize the disk as MBR or GPT.
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Author Comment

by:thomasfisher
ID: 22818202
I have tried that but there is no option to initialize as MBR or GPT - it initilizes as MBR by default and then gives the option to conver to Dynamic only
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Expert Comment

by:HenrichSt
ID: 22819923
erm, is there cluster configuration based on your server? I see the only reason why you cannot change it to GPT - cluster.
Have a look on this article of Microsoft: http://support.microsoft.com/kb/919117
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noxcho earned 500 total points
ID: 22819936
yeah, was going to suggest this. Is there any Non common configuration where your server takes part?
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Author Closing Comment

by:thomasfisher
ID: 31509095
thanks for your help guys - i created 2 logical drives that are both under 2tb and spanned into 1 volume
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