Change a GUID Partition

Change a GUID Partition Table Disk into a Master Boot Record Disk

Applies To: Windows 7, Windows Server 2008 R2
Master boot record (MBR) disks use the standard BIOS partition table. GUID partition table (GPT) disks use unified extensible firmware interface (UEFI). MBR disks do not support more than four partitions on each disk. The MBR partition method is not recommended for disks larger than 2 terabytes.
You can change a disk from GPT to MBR partition style as long as the disk is empty and contains no volumes.
Backup Operators or Administrator is the minimum membership required.
noteNote
Before you convert disks, close any programs that are running on those disks.

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

To change a GUID partition table disk into a master boot record disk using the Windows interface

  1. Back up or move all volumes on the basic GUID partition table (GPT) disk you want to convert into a master boot record (MBR) disk.
  2. If the disk contains any partitions or volumes, right-click any volumes on the disk and then click Delete Volume.
  3. Right-click the GPT disk that you want to change into an MBR disk, and then click Convert to MBR disk.

To change a GUID partition table disk into a master boot record disk using command line

  1. Back up or move all volumes on the basic GUID partition table (GPT) disk you want to convert into a master boot record (MBR) disk.
  2. Open an elevated command prompt and type diskpart. If the disk does not contain any partitions or volumes, skip to step 6.
  3. At the DISKPART prompt (right-click Command Prompt, and then click Run as Administrator), type list disk. Make note of the disk number you want to delete.
  4. At the DISKPART prompt, type select disk <disknumber>.
  5. At the DISKPART prompt, type clean.
    ImportantImportant
    Running the clean command will delete all partitions or volumes on the disk.

  6. At the DISKPART prompt, type convert mbr.

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