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

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 ;\

I would install Windows 7 & Windows 8 on the 500gb drive in UEFI mode.

http://www.eightforums.com/tutorials/2344-dual-boot-installation-windows-8-windows-7-vista.html


UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with - Windows 7 Help Forums
or
http://www.eightforums.com/tutorial...e-firmware-interface-install-windows-8-a.html

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.

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

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

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

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.

criticalera said:

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

Click to expand...

One more thing, are Windows 7 & 8 both install in UEFI mode?