How to Convert MBR to GPT without Data Loss in Windows Server 2008 R2?

August 24, 2017

Have problem with Windows 2008 (R2) convert MBR to GPT? This article will tell you how to convert MBR to GPT without data loss in Windows 2008 (R2) and Windows Server 2003, 2012 (R2), 2016.

Need to convert MBR disk to GPT in Windows Server 2008

Some Windows Server 2008 (R2) users would find that their 3TB hard drive or larger hard drive only shows 2TB on Windows Explorer. For this situation, you need to know that it should be the problem of your partition styles.

MBR, the master boot record, is a partition style that supported by the legacy BIOS. It only allows you to create up to 4 primary partitions. If you need more partition, you need to convert primary partition to logical partition so that you can get more than 4 partitions on the MBR disk. Besides, it only supports disk volume up to 2TB. If the disk is larger than 2TB, the space beyond 2TB will not be shown in Windows Explorer, and when you get into Windows Disk Management, you can see it as unallocated space.

GPT, the GUID partition table, is another partition style different from MBR. It requires that your motherboard supports EFI/UEFI. You can create up to 128 primary partitions on the GPT disk, and it supports large volume disk. It is more flexible than MBR disk.

For the different properties of MBR and GPT, you need to convert MBR disk to GPT in Windows Server 2008 (R2) sometimes. For example, if your hard drive is larger than 2TB, but it only shows 2TB, you need to convert MBR to GPT; or if you need more than 4 primary partitions on the hard drive, but the MBR does not allow you to create more primary partitions, you need to convert MBR disk to GPT in Windows Server. Well, here is the question, how to convert MBR disk to GPT without data loss in Windows Server 2008 (R2)?

Windows 2008 cannot convert MBR to GPT disk

Windows Server 2008 Disk Management provides you the function Convert to GPT Disk, however, when you try to use it to convert MBR to GPT in Windows Server 2008 (R2), you may find that the Convert to GPT Disk grayed out.

1. Open Windows Server 2008 (R2) Disk Management. Right click the MBR disk, select Convert to GPT. You will find the option is gray so that you cannot convert MBR to GPT here.

Convert to GPT Grayed out

Actually, the Windows 2008 (R2) Disk Management can only convert an empty MBR disk to GPT, if MBR disk has partitions, the convert to GPT is gray by default. If you need to convert the MBR disk to GPT, you have to delete all partitions on the hard drive and then, it can be converted. Thus, the data on the hard drive would be deleted, too.

If you have partitions on the disk, you can use the following two methods to convert the disk from MBR to GPT in Windows Server 2008 (R2).

> Backup hard disk, delete all partitions and then use the Windows Disk Management to convert the disk from MBR to GPT.

> Use a third party software called AOMEI Partition Assistant Server to convert MBR to GPT without data loss in Windows Server 2008 (R2).    

How to convert MBR to GPT without data loss Windows 2008  

If you want to convert MBR to GPT without deleting your partitions, then, using AOMEI Partition Assistant Server to do it should be the best way - It provides you the very easy way to convert MBR to GPT without data loss in Windows 2008 (R2), and Windows Server 2003, 2012 (R2), 2016, and all Windows PC OSes. Here are the detailed steps of how to convert MBR to GPT without data loss in Windows Server 2008.

* Before you convert MBR disk to GPT, make sure your motherboard supports EFI/UEFI. Otherwise, you cannot boot successfully after the conversion.

* Windows 32bit system does not work on a GPT disk. Thus, if your system is 32bit, the operation is unable to continue. You need to upgrade your system to 64bit. 

Step1. Install and launch AOMEI Partition Assistant Server. It will show you the main interface that contains the basic situation of your hard drives. Right click the MBR disk you need to convert to GPT disk. Select Convert to GPT Disk.  

Convert to GPT

Step2. It will pop out a window to ask if you are sure to convert the selected disk from MBR to GPT, click OK->Yes to confirm.

Convert MBR to GPT

Step3. You will back to the main interface, you’ll see the MBR disk has already changed into GPT partition type. Then, click Apply at the toolbar to submit the whole progress.

Apply

Conclusion

Using AOMEI Partition Assistant is a great way to convert MBR to GPT without data loss in Windows Server 2008 (R2), 2012 (R2), 2016, and Windows 10/8/7. You can also use it to convert MBR system disk to GPT without losing data. It is more than an MBR GPT disk converter. As a great disk partition manager, it also provides you many other features for managing partition like extend Windows Server 2008 system partition, convert NTFS to FAT32, etc. Apart from Server edition, you can you can also choose AOMEI Partition Assistant Unlimited for unlimited computers within one company at one location, and AOMEI Partition Assistant Technician for unlimited computers at multiple locations.