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How to dual boot windows 8 and windows 7 on EFI GPT

  1. #1


    Posts : 4
    Windows7/8

    HELP!?! can't dual boot windows 8 and windows 7 on EFI GPT


    Here is my dilemma, I have 3 hard drives a 500gig drive and 2 3TB drives. in order to get full disk space....I had to change my drives to GPT in a UEFI environment.. I installed windows 8 on one of the 3 tb drives and then installed windows 7 on the 500 gig drive. I have successfully booted into both windows but not by bootloader, the only way I can get into either is by switching the drive order in the efi. if I have the windows 8 drive on top then I cannot access windows 7 through bootloader.....I get a signature error and if I swap I get the same error for the other windows. I am guessing that since the boot info is on each partition...I am royally screwed and will have to enter each windows by changing the boot sequence. please tell me there is a solution to this, please ;\
    Last edited by criticalera; 16 Jan 2014 at 01:12.

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  2. #2


    Posts : 5,592
    ME, XP,Vista,Win7,Win8,Win8.1
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  3. #3


    Posts : 4
    Windows7/8


    Yeah that won't really work for me because 500 gigs for 2 OS's will fill up too quickly. I am a graphic/web designer and also a gamer....I suppose if the only way to boot is by selecting the disk at startup....I can live with it. I just thought maybe there was a quickfix or a simple solution. I also just installed Ubuntu on the 500 gig partition along with windows 7.....every OS loads perfectly when switching disk at startup but no luck still with the bootloader.
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  4. #4


    Posts : 5,592
    ME, XP,Vista,Win7,Win8,Win8.1


    Try adding the OS to the boot loader with
    EasyBCD - NeoSmart Technologies
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  5. #5


    Posts : 4
    Windows7/8


    Easybcd was the first thing I tried, didn't work.
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  6. #6


    Posts : 5,592
    ME, XP,Vista,Win7,Win8,Win8.1


    As you have now installed Linux, you may be able to use GRUB to add a OS.
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  7. #7


    Posts : 4
    Windows7/8


    yeah that's a good idea, I will have to do some homework as I am a complete N00b on linux. I just installed it to learn. thanks for the tip. hopefully i can get this thing to boot conveniently. I mean it's not really that big of a deal but ofcourse would be ideal for it to work as it should. anyways thanks for the tip.
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  8. #8


    Posts : 5,592
    ME, XP,Vista,Win7,Win8,Win8.1


    Quote Originally Posted by criticalera View Post
    Easybcd was the first thing I tried, didn't work.
    One more thing, are Windows 7 & 8 both install in UEFI mode?
      My System SpecsSystem Spec

How to dual boot windows 8 and windows 7 on EFI GPT
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