MBR stands for Master Boot Record, it uses the standard BIOS partition table whereas the GUID partition table (GPT) disk uses unified extensible firmware interface (UEFI).
There is one limitations in MBR disk is that you cannot have more than four partitions in one disk, therefore GPT disk is used to create more than four partitions in disks. For the disks with size 2 TB or above must be converted into GPT in order to install Windows.
But one cannot convert the MBR disk into GPT disk without deleting the partitions of the disk. Therefore you must backed up all your data into external source in order to secure your data.
Steps for converting MBR disk into GPT disk
There is one limitations in MBR disk is that you cannot have more than four partitions in one disk, therefore GPT disk is used to create more than four partitions in disks. For the disks with size 2 TB or above must be converted into GPT in order to install Windows.
But one cannot convert the MBR disk into GPT disk without deleting the partitions of the disk. Therefore you must backed up all your data into external source in order to secure your data.
Steps for converting MBR disk into GPT disk
- Back up all your data into external source in order to secure them.
- Open the command prompt into Administrator mode (Right click on Command Prompt and select Run as Administrator).
- Write Diskpart and press Enter.
- Type list disk (this will list out all the available disks)
- Now select the disk that you want to convert into GPT disk by typing select disk disk_number and press Enter
- Now type clean to erase all the partitions or volumes of the disk (skip this step if your disk does not contain any volume).
- Then type convert gpt .
- Congrats your disk has been converted into GPT disk.
Also Read: Hide HardDisk On Windows
Tips and Precautions:
- In windows 8 right click on left-bottom corner and click Command Promp(Admin) to run as Administrator.
- If you have only single disk(and it contains windows) then you have to boot the system using bootable disk or pendrive then follow the below steps.
- Boot the system from bootable disk or pendrive
- Wait until the file is loading
- After loading is completed press SHIFT + F10 ,which will open the command prompt and you can follow the steps given above.
- This process will delete the Windows installed and you have to install it again.
- Removable devices cannot be converted into GPT disk.

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