Hello, i just upgraded my 840pro to a 960 evo m.2 drive and im having a little problem getting the m.2 to become the primary boot drive. I migrated the OS no problem, and if i then shutdown and remove my 840 pro then everything is fine, but if i then try to put the 840 back in it seems to take control of the boot again. I tried disabling the drive in the bios, that just causes a boot fail on the m.2 and tells me to repair windows, i also tried just changing the 960 into the boot drive, this also causes the same boot fail. As soon as i plug the 840 in again i lose the windows boot manager option for the 960 in the bios and it goes back onto the 840 again. Im guessing its because its a cloned drive it cant distinguish the two. All i wanna do is just wipe the 840 and keep it for a little extra games storage, i thought maybe i can delete the boot files while in windows or something, anyone more knowledgeable about such things who could help me out? Cheers.