To change a GUID partition table disk into an master boot record disk (64-bit only)

Using the Windows interface

1.

Back up or move all volumes on the GUID partition table (GPT) disk you want to convert into a master boot record (MBR) disk. If the disk is already empty, skip to step 2.

For more information about backing up volumes, see Related Topics.

2.

Open Computer Management (Local) 

3.

In the console tree, click Disk Management.

Where?

Computer Management (Local) > Storage > Disk Management

4.

If the disk is empty, skip to step 5. Otherwise, right-click the any volumes on the disk and then click Delete Volume.

5.

Right-click the GPT disk that you want to change into an MBR disk, and then click Convert to MBR disk.

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. 

On Itanium-based computers, you can change a disk from GPT to MBR as long as the disk is empty.

x86-based computers support only MBR disks. Itanium-based computers support both MBR and GPT disks.

Using a command line

1.

Back up or move all volumes on the GUID partition table (GPT) disk you want to convert into a master boot record (MBR) disk. If the disk is already empty, skip to step 2.

For more information about backing up volumes, see Related Topics.

2.

Open Command Prompt

3.

Type:

diskpart

If the disk is already empty, skip to step 7.

4.

At the DISKPART prompt, type:

list volume

Make note of the number of the volume that you want to delete.

5.

At the DISKPART prompt, type:

select volume n

6.

At the DISKPART prompt, type:

delete volume

7.

At the DISKPART prompt, type:

list disk

Make note of the disk number of the disk that you want to convert to an MBR disk.

8.

At the DISKPART prompt, type:

select disk n

9.

At the DISKPART prompt, type:

convert mbr

 Important

The disk must be empty to convert it to an MBR disk. Back up your data and then delete all partitions or volumes before converting the disk.

ValueDescription

list volume

Displays a list of basic and dynamic volumes on all disks.

select volume

Selects the specified volume, where n is the volume number, 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.

delete volume

Deletes the selected volume. You cannot delete the system volume, boot volume, or any volume that contains the active paging file or crash dump (memory dump).

list disk

Displays a list of disks and information about them, such as their size, amount of available free space, whether the disk is a basic or dynamic disk, and whether the disk uses the master boot record (MBR) or GUID partition table (GPT) partition style. The disk marked with an asterisk (*) has focus.

select disk

Selects the specified disk, where n is the disk number, and shifts the focus to it.

convert mbr

On Itanium-based computers, converts an empty basic disk with the GUID Partition Table (GPT) partition style to a basic disk with the master boot record (MBR) partition style.

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. 

On Itanium-based computers, you can change a disk from GPT to MBR as long as the disk is empty.

x86-based computers support only MBR disks. Itanium-based computers support both MBR and GPT disks.

For more information about DiskPart, see Related Topics.

Related Topics

Back up files to a file or a tape

Backup overview

DiskPart

Change a master boot record disk into a GUID partition table disk

Storage types and partition styles



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