To remove a mirror from a mirrored volume

Using the Windows interface

Open Computer Management (Local)

In the console tree, click Disk Management.

Where?

Computer Management (Local) > Storage > Disk Management

Right-click the mirror you want to remove, click Remove Mirror, and then follow the instructions on your screen.

Important

•	Once you remove a mirror from a mirrored volume, the removed mirror becomes unallocated space and the remaining mirror becomes a simple volume that is no longer fault tolerant All of the data on the removed mirror is deleted.

Note

•	To open Computer Management, click Start, and then click Control Panel. Click Performance and Maintenance, click Administrative Tools, and then double-click Computer Management.
•	You must be logged on as an administrator or a member of the Administrators group in order to complete this procedure. If your computer is connected to a network, network policy settings may also prevent you from completing this procedure.

Using a command line

1.	Open Command Prompt
2.	Type: diskpart
3.	At the DISKPART prompt, type: list volume Make note of the volume number of the mirrored volume you want to break into two separate volumes.
4.	At the DISKPART prompt, type: select volume n
5.	At the DISKPART prompt, type: detail volume
6.	At the DISKPART prompt, type: break disk n [nokeep]

Value	Description
list volume	Displays a list of basic and dynamic volumes on all disks.
select volume n	Selects the specified volume and shifts the focus to it. If no volume is specified, the select command lists the current volume with focus. You can specify the volume by number, drive letter, or mount point path. On a basic disk, selecting a volume also gives the corresponding partition focus. You can view the numbers of all volumes on the computer by using the list volume command.
detail volume	Displays the disks on which the current volume resides.
break disk n	Applies to dynamic disks only. Breaks a mirrored volume into two simple volumes. These volumes are no longer fault tolerant The disk specified by n receives the focus so you can assign it a drive letter. If the specified disk is a system or boot volume, the command fails. The other disk retains the drive letter and any mount points that belonged to the mirrored volume. Using the nokeep parameter, the specified disk, n, is deleted and converted to free space, while the other half of the mirror is retained as a simple volume. Neither volume receives the focus.
nokeep	Specifies that only one of the mirrored volumes retained; the other simple volume is deleted and converted to free space. Neither volume receives the focus.

•	Once you remove a mirror from a mirrored volume, the removed mirror becomes unallocated space and the remaining mirror becomes a simple volume that is no longer fault tolerant All of the data on the removed mirror is deleted.

Note

•	To open command prompt, click Start, point to All Programs, point to Accessories, and then click Command Prompt.
•	You must be logged on as an administrator or a member of the Administrators group in order to complete this procedure. If your computer is connected to a network, network policy settings may also prevent you from completing this procedure.
•	For more information about DiskPart, see Related Topics.