So while I understand what you want to do, i'm not sure what you want to do if that makes sense. I will add my 2 cents in however. From everything i've read, UEFI uses GPT as the file table for the HDD while BIOS uses MBR. My first thought would be if you are using UEFI on a hard drive that is formatted to MBR, maybe it cannot read it as a boot drive? I have heard that UEFI can see it as a file drive, but nothing has been said about booting from MBR if you are using UEFI.
beamermt79
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April 2nd, 2016 13:00
So while I understand what you want to do, i'm not sure what you want to do if that makes sense. I will add my 2 cents in however. From everything i've read, UEFI uses GPT as the file table for the HDD while BIOS uses MBR. My first thought would be if you are using UEFI on a hard drive that is formatted to MBR, maybe it cannot read it as a boot drive? I have heard that UEFI can see it as a file drive, but nothing has been said about booting from MBR if you are using UEFI.