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Windows 7: Convert MBR Disk to GPT Disk

24 Sep 2009   #19
Brink
Microsoft MVP

64-bit Windows 8.1 Enterprise
 
 
Convert MBR Disk to GPT Disk

How to Convert a MBR Disk to a GPT Disk



My System SpecsSystem Spec
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26 Sep 2011   #20
Winefly

Windows 7 Pro 64-bit SP1
 
 

When I right click the unallocated space, all the options are greyed out, preventing me from creating a new volume of any type...

My System SpecsSystem Spec
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26 Sep 2011   #21
Brink
Microsoft MVP

64-bit Windows 8.1 Enterprise
 
 

Winefly,

Well it was worth a try. Looks like you will need to use step 2 in OPTION TWO of this tutorial to convert the disk to GPT in a command prompt at boot. Afterwards, do a clean install of Windows 7 on it. Be sure to backup anything that you do not want to lose first though.
My System SpecsSystem Spec
28 Sep 2011   #22
Winefly

Windows 7 Pro 64-bit SP1
 
 

All up and running, new partitions in gpt. Thanks for your help, Brink.


Attached Thumbnails
Convert MBR Disk to GPT Disk-newhdd.jpg  
My System SpecsSystem Spec
28 Sep 2011   #23
Brink
Microsoft MVP

64-bit Windows 8.1 Enterprise
 
 

You're most welcome Winefly.
My System SpecsSystem Spec
11 Oct 2011   #24
XrayDoc88

Windows 7 Pro x64
 
 
GPT Data Disk Confusion

At the start you say that you can still use a GPT disk for data even if your boot disk is a MBR. But is it still required to have an EFI BIOS in this setting? Or is the EFI BIOS only needed for booting from a GPT disk? Thanks.
My System SpecsSystem Spec
11 Oct 2011   #25
Brink
Microsoft MVP

64-bit Windows 8.1 Enterprise
 
 

Hello XrayDoc, and welcome to Seven Forums.

A EFI BIOS would only be required if your were booting from a GPT disk.
My System SpecsSystem Spec
11 Oct 2011   #26
XrayDoc88

Windows 7 Pro x64
 
 
GPT and RAID

This is a little off topic, but is there any advantage or reason to use GPT disks if you're building a RAID 5 array with five 2 TB hard drives? It seems like either way, you could still have a single huge partition, correct?
My System SpecsSystem Spec
11 Oct 2011   #27
Brink
Microsoft MVP

64-bit Windows 8.1 Enterprise
 
 

Not unless you wanted any part of the RAID to be over 2 TB in size.
My System SpecsSystem Spec
11 Oct 2011   #28
XrayDoc88

Windows 7 Pro x64
 
 

Oh, so if you were to use five 3 TB MBR drives in a RAID array, the array would only see five 2 TB drives?
My System SpecsSystem Spec
11 Oct 2011   #29
Brink
Microsoft MVP

64-bit Windows 8.1 Enterprise
 
 

Correct, unless you broke them down to smaller sizes in Disk Management, or used GPT to use over 2 TB.
My System SpecsSystem Spec
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 Convert MBR Disk to GPT Disk





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