Windows 8 and 8.1 Forums


Can I Convert My SSD (OS) Drive From MBR to GPT?

  1. #1


    Posts : 70
    Windows 8 Pro

    Can I Convert My SSD (OS) Drive From MBR to GPT?


    Hello All,

    I was playing around with this new program I bought called Paragon HD Manager.

    I ran it on my laptop which is only about one month old and has two hard drives: a Samsung 830 SSD (for the OS) and an HGST Travelstar HDD (for data). I then ran the program on my desktop PC which also has two hard drives: a Samsung 840 PRO SSD and a Western Digital Raptor HDD. I immediately noticed one thing that was different between my laptop and my desktop PC.

    On the laptop both hard drives were marked as Basic GPT, however, on my desktop only the secondary drive was marked as GPT. The primary drive was marked as MBR.

    Here are some screenshots to demonstrate:

    Click image for larger version Click image for larger version

    I have no idea why my desktop PC has a drive that is MBR and another that is GPT nor do I know why my laptop has both GPT. I never even knew about MBR vs GPT so I guess I didn't pay much attention. Also, whenever I install Windows 8.1 Pro (which I do quite frequently) I have never seen anything in the install process that asks whether I want to install using MBR or GPT.

    I can only assume that it has something to do with the fact that my laptop is so new and my desktop is a couple years old. However, the SSD in my laptop (which is marked as GPT) is as old as the one in my desktop. I had it lying around and when I got the laptop I swapped out the original HD for that SSD, added a 2nd HDD, and did a clean Win 8.1 Pro install.

    Anyway, I have 2 questions regarding MBR vs GPT:

    1. I have done some fast Google'ing and from what I have seen so far it appears that GPT is better. Is it significantly better than MBR and should I convert it to GPT?

    2. If I can convert my SSD to GPT will I have to do a brand new install of Windows or are there programs out there that can convert it for me without causing any major issues?

    Thank you,

    Jan

      My System SpecsSystem Spec

  2. #2


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    Hi Jan,
    It's really does not matter if your Windows was installed with MBR or GPT. GPT supports HD > 2TB, secure Boot. In term of speed it will not be any benefit.

    EDIT: You would have to re-install Windows if you want to use GPT.
      My System SpecsSystem Spec

  3. #3


    Posts : 70
    Windows 8 Pro


    Quote Originally Posted by topgundcp View Post
    Hi Jan,
    It's really does not matter if your Windows was installed with MBR or GPT. GPT supports HD > 2TB, secure Boot. In term of speed it will not be any benefit. EDIT: You would have to re-install Windows if you want to use GPT.
    I just read somewhere that GPT is for UEFI motherboards.

    I don't think my ASUS N550JK laptop has a UEFI BIOS and yet both disk drives are GPT. My Desktop PC has a new MSI Micro ATX Motherboard (A78M-E45*) which has a UEFI BIOS and I have installed a fresh Win 8.1 OS after putting in the motherboard.

    * MSI USA A78M-E45
      My System SpecsSystem Spec

  4. #4


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    Hi Jan,
    I am pretty sure that your Laptop has UEFI supported, otherwise you won't be able to install Windows using UEFI style. However, it is just the terminology they use that sometimes confuse the hell out of us. In your BIOS, you should have an option called CSM (Compatibility Support Module). If you turn it off then you are using UEFI mode. With GPT DATA disk, you have no problem reading it since Windows XP but to install Windows using GPT style, your Laptop must have UEFI support.
      My System SpecsSystem Spec

Can I Convert My SSD (OS) Drive From MBR to GPT?
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