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Windows 7 Thread, Convert GPT to MBR in Technical; ...
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    Devontechie's Avatar
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    Convert GPT to MBR

    I have got 3 Acer Laptops that came with Windows 7 & 8. We want them running Windows 7 so we can run TrueCrpyt. Truecrpt doesn’t work on drives that have a GUID Partition Table (GPT). So I found that I can do a DISKPART and remove all the partitions and convert to MBR. The drive shows has not being GPT. The bios is set to legacy boot. When I try installing Windows 7, I get “Windows cannot install to this disk. The selected disk has an MBR partition table. On EFI systems, Windows can only be installed to GPT disks.”

    Anyone got any ideas on what to do?

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    kevin_lane's Avatar
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    How big is the disk also try setting the hard drive to either compatibility or apci and see what that does

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    From what you've described, you have successfully converted the disk to MBR. However, you now need to switch off EFI in the BIOS. It's currently switched on and that's why Windows is complaining.

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    Quote Originally Posted by kevin_lane View Post
    How big is the disk also try setting the hard drive to either compatibility or apci and see what that does
    @kevin_lane The disk in only 500GB

    Quote Originally Posted by AngryTechnician View Post
    From what you've described, you have successfully converted the disk to MBR. However, you now need to switch off EFI in the BIOS. It's currently switched on and that's why Windows is complaining.
    @AngryTechnician I can only find UEFI in the Boot Mode in the BIOS. I have got that set yo Legacy BIOS.

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    Its due to the Windows Installation - When you install it on a GPT it reconfigures for the dynamic disk etc. I do believe you will have to reinstall Windows.

    (This happened to me using Windows 8, I had a perfectly good MBR and it changed it to damm GPT!)

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    Quote Originally Posted by SovietRussia View Post
    Its due to the Windows Installation - When you install it on a GPT it reconfigures for the dynamic disk etc. I do believe you will have to reinstall Windows.

    (This happened to me using Windows 8, I had a perfectly good MBR and it changed it to damm GPT!)
    @SovietRussia I am reinstalling Windows on it.

    It seems like I get the drive to be MBR when using DISKPART but as soon as I install Windows 7, the drive goings to GPT. Its driving me mad! lol!

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    kevin_lane's Avatar
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    Strange because you should only use gpt with drives over 2TB I believe

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    Quote Originally Posted by kevin_lane View Post
    Strange because you should only use gpt with drives over 2TB I believe
    As you can imagine, its driving me mad. It came with Windows 7 & Windows 8. So we went for Win7 but couldn't use Truecrpyt because of the GPT. So I thought I'd remove all partitions & convert to MBR using DISKPART and then install Win 7 again after I had changed the BIOS to Legacy BIOS and it would work.. It installs but its still GPT!

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    Sounds daft, but if you're installing from DVD, is the DVD drive in EFI mode in the BIOS? If so, try changing it to Legacy/SATA mode and try to install again.

    Apparently some BIOS will try to boot from DVD in both modes; if yours is doing that the "press any key to boot from DVD" will appear twice, try waiting for the second time then pressing a key

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    try using a linux disk to kill the partitions

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    Diskpart from what 7 or 8? I assume the drive shows up in diskpart on 7? You may still need to add the controller driver though.

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    Quote Originally Posted by sted View Post
    try using a linux disk to kill the partitions
    @sted Is there any Linux disk you would recommend? I am not good with Linux!

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    Parted Magic ?

    start - Parted Magic

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    Quote Originally Posted by DMcCoy View Post
    Diskpart from what 7 or 8? I assume the drive shows up in diskpart on 7? You may still need to add the controller driver though.
    @DMcCoy I used DISKPART from Windows 7. It was done by going pressing Shift F10 for the CMD when the Windows install starts

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    Quote Originally Posted by stevehill06 View Post
    @sted Is there any Linux disk you would recommend? I am not good with Linux!
    for deleting drive partitions pick one it will probably make 0 difference you arnt installing the os just using its disk tools from the install media

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