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On new system where windows 8.1 installed already, I have shrieked the partition and tried to install RHEL 6. But the DVD is not detectable (may be because it is not supporting UEFI boot source).

So I have disabled the "Boot Security" option from BIOS and installed RHEL using "Legacy boot source". But the problem is windows 8.1 is NOT get detected when I choose to boot from "Legacy Boot Source". And when I choose "UEFI Boot Source", then only windows 8.1 is detectable.

Now there is only way to switch between OS is to use "Boot Option" (press F9) every time which does NOT seem a good idea. Is there any other way?

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First Are we dealing with MBR or GPT partitions? Update your question to include this information. Second you are dealing with UEFI Firmwarenot BIOS. The best method would be to use MBR partitions, install both operating systems in legacy mode, if you want both in the boot options. Additionally RHEL 6 supports UEFI why did you install in legacy mode in the first place? –  Ramhound Jun 19 at 11:48
    
RHEL 6 is already installed –  Tejas Jun 19 at 11:50
    
Its installed but installed it using the leagcy boot options which means it didn't install any of the require efi files. I need to understand the reason you used the legacy boot source options that shouldn't have been required. I need answer to the questions I asked. –  Ramhound Jun 19 at 11:59
    
Tejas stated that the reason for installing in legacy mode was that the computer didn't boot the RHEL6 disc in EFI mode. –  Rod Smith Jun 19 at 17:20
    
yes NOT booting in EFI mode –  Tejas Jun 20 at 10:20

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