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MBR disks support only four partition table entries. That is to say, it only allows users to create four primary partitions at most. If more partitions are wanted, a secondary structure known as an extended partition is necessary. Extended partitions can then be subdivided into one or more successive logical disks. Another common practice is to use partitioned or "hidden" sectors to hold specific information. That practice is undocumented and results in severe system problems that are difficult to debug. Over the years, vendor-specific implementations and tools have been released to the public, making support difficult.
Compared with MBR disk, GPT disks can grow to a very large size. The number of partitions on a GPT disk is not constrained by temporary schemes such as container partitions as defined by the MBR Extended Boot Record (EBR).
The GPT disk partition format is well defined and fully self-identifying. Data critical to platform operation is located in partitions and not in unpartitioned or "hidden" sectors. GPT disks use primary and backup partition tables for redundancy and CRC32 fields for improved partition data structure integrity. The GPT partition format uses version number and size fields for future expansion.
The following will show you how to convert a MBR disk to a GPT disk with EaseUS Partition Master, Windows Disk Management and Diskpart command.
1. You must have administrator privilege to do this in Windows.
2. Before you convert a disk, be sure to backup the disk that you want to convert to GPT disk. Converting the disk requires that all partitions and volumes are deleted on the disk first.
EaseUS Partition Master can only convert empty disk without partitions. Please delete all the partitions on the disk. We suggest you back up the disk before converting by the built-in Copy Wizard of EaseUS Partition Master. Please read this article for the detailed steps: Disk Copy Wizard in EaseUS Partition Master to protect data.
1. Launch EaseUS Partition Master. Right click the disk; choose "Delete all partitions".
2. Click "OK" to confirm the deletion.
3. Choose the empty disk, right click it and then select "Initialize to GPT"
Initialize to GPT disk
4. Click "Apply" to do all the pending operations. The disk is in GPT format now.
1. Right click "My Computer" and choose "Manage" -> "Storage" -> "Disk Management".
2. Delete all volumes on the MBR hard disk which you want to convert to GPT disk.
3. Right click on the hard disk 1 and choose "Convert to GPT disk". After you convert MBR disk to GPT disk, you can create partitions on the GPT disk if you like.
The following will convert disk 1 to GPT disk.
1. Open command prompt.
2. In the command prompt, type diskpart and press enter.
3. Type list disk and press enter.
4. Type select disk 1 and press enter.
5. Type detail disk and press enter. This will give you a list of all the volumes on the selected disk. If you do not have any volumes listed, then you can go to step 9.
6. Type select volume 5 and press enter.
7. Type delete volume and press enter.
8. Repeat steps 6 and 7 for each volume listed in step 5 until you have deleted all volumes.
9. Type select disk 1 and press enter.
10. Type convert gpt and press enter.
11. Type exit and press enter.
Following either solution above, you can change the MBR disk to GPT disk for free.
Do not forget to back up your data in Case of Data Loss! Back up with the most advanced backup software - EaseUS Todo Backup Workstation.