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GUID partition table properties are removed during upgrade to dynamic disk

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When you upgrade a GUID partition table (GPT) disk to a dynamic disk, you may find that properties that were applied to the disk, such as Read-Only or Hidden, are removed.

Also, if you are using the Volume Shadow Copy Service (VSS), the disk may appear two times in Disk Management.

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This issue may occur if both of the following are true:
  • The GPT disk does not have the required flag applied that marks the drive as OEM.
  • The GPT disk is upgraded to a dynamic disk.

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To work around this issue, use registry and file system access control lists (ACLs) to control access to the disk.

Note You may have to convert the disk to the NTFS file system to do this.

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More information

You can use the DiskPart utility with the List Partition, Select Partition, and Detail Partition commands to determine if a partition has specific GPT attributes.

The List Partition command displays the partitions that are listed in the partition table of the current disk. On dynamic disks, these partitions may not correspond to the dynamic volumes on the disk. This difference occurs because dynamic disks contain entries in the partition table for the system volume or boot volume (if present on the disk). They also contain a partition that occupies the remainder of the disk to reserve the space for use by dynamic volumes.

The Select Partition command selects the specified partition and gives it focus. If no partition is specified, the select command lists the current partition with focus. You can specify the partition by its number. You can view the numbers of all partitions on the current disk by using the List Partition command. You must select a disk by using the DiskPart select disk command before you can select a partition.

Use the following syntax with the select partition command, where x is the number of the partition to receive the focus:
Select Partition = x
The Detail Partition command displays the properties of the selected partition.

For example, type the following commands at the command line (where x is the number of the partition to receive the focus), and then press ENTER after each command:
List Partition
Select Partition x
Detail Partition
For more information about using DiskPart with Windows Server 2003, visit the following Microsoft Web site:

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Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.

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Keywords: KB811941, kbbug

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Article Info
Article ID : 811941
Revision : 7
Created on : 11/27/2007
Published on : 11/27/2007
Exists online : False
Views : 113