Windows 7 Convert MBR to GPT Disk Without Losing Data
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After Windows XP is Vista, but it doesn’t last very long. Compared with Windows 7, Windows Vista is a bad version. So many people upgrade Windows XP to Windows 7 directly.

You have to know, all Windows can boot from a MBR disk, but can only boot from a GPT disk if your motherboard has an enabled UEFI and you have an operating system such as Windows 7 or Windows 8 which supports booting to GPT that is installed with UEFI. Windows XP doesn’t support boot from a GPT disk. Even though only Windows XP 64-bit supports reading a GPT disk.

You will be confused about these items after you have read the above paragraph. Now I’d like to explain briefly about these.

MBR is short for Master Boot Record Disk. It supports up to 2TB per single partition. GPT is short for Guid Partition Table Disk and supports up to 256TB per single partition in Windows. MBR disk supports up to 4 primary partitions or 3 primary partitions and 1 extended partition. By contrast, GPT disks supports up to 128 Primary partitions. I think these are the most obvious differences between MBR and GPT disk.

The Unified Extensible Firmware Interface (UEFI)is a specification that defines a software interface between an operating system and platform firmware. UEFI is meant to replace the Basic Input/Output System (BIOS) firmware interface. Only one point should you sculpture it in your mind: system installed on GPT disk can only boot from UEFI.

Now I will tell you how to convert MBR to GPT disk in Windows 7 if you think GPT disk is useful to you. Generally speaking, there are three solutions.

1. Convert MBR disk to GPT disk using Diskpart command line (only support empty disk).

2. Convert MBR disk to GPT disk using the Windows Disk Management (only support empty disk).

3. Convert MBR disk to GPT disk with partition software (like AOMEI Partition Assistant Pro).

Here I want to focus on the third method. Because I think it is the best, simplest way and won't cause data loss.

  • Select the disk you want to convert to GPT.
  • Right click on it and select "Convert to GPT Disk".
  • Convert MBR to GPT

  • Confirm your operation, by clicking "OK" to continue.
  • Click OK

  • Click "Apply" on the toolbar to commit the changes.
  • Apply

Tips: Before you converting a disk, you’d better backup the disk that you want to convert to GPT.

Besides converting between MBR and GPT, you can also convert between NTFS and FAT, and convert primary to logical partition with AOMEI Partition Assistant Pro.

Highlight: A new function of AOMEI Partition Assistant named "Windows to Go Creator" started with its latest version. With this function, you can make a portable Windows 8 that does not need Enterprise Edition and hardware requirement is also lower than Microsoft official states.

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