Trouble booting to USB

Soldato
Joined
27 Mar 2009
Posts
3,546
I put another SSD in my system over Christmas to install Windows 10 to so I could dual boot and try it out before Installing it over my current Windows 7 install.

No problems here, Decided I can live with it and today thought I would do my main OS.

This is where the problems start. I can no longer boot from USB ( the same one I've already used to install Windows 10 with). No matter if I put it first in the boot priorities or press F11 and select to boot from it. it just skips straight over it and Windows 7 boots.

I've managed to get round it by only having the USB drive plugged in and plugging in my Windows 7 SSD as the Windows 10 logo is loading but then Its telling me "Windows cannot be installed to this disk, You system might not be able to boot from this disk" or something like that.

Well it clearly can as it already has windows 7 on it!

Any suggestions? I dont believe the BIOS on my GPU is UEFI compatible so I have legacy turned on and currently my System SSD is in a single partition MBR format.

Most annoyed about the USB booting though as nothing has changed from when I did it the other day but its having non of it. What's compounding the problem is I cant see what is happening. I've just got a new monitor and its so slow looking through its inputs that I see BIOS logo flash up and nothing is on the screen again until I get into windows.

EDIT*

Adding some more info. Think I've sorted the USB booting "issue" as per usual its the idiot sat between the the keyboard and the screen at fault.

This is how my drives look, Disk 0 is what I'm going to install 10 on but its complaining that it cant be installed on it. the only thing thats got me thinking is the 100mb EFI partition that is on my 1TB data drive. Is that normal or should that really be on my Disk 0?

When I tried to install it earlier I only had Disk 0 (my OS SSD) connected

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