http://www.maketecheasier.com/disable-secure-boot-in-windows-8
legacy vs UEFI mode
so here is the solution, everytime you add a drive you will have to
switch the bios to legacy mode then switch back to uefi mode.
if your
computer came with windows 8 then more than likely your bios is set to
uefi. when you switch the bios to legacy your computer will error and
tell you that it did not find any boot drives. no worries, switch it
back to uefi, reboot, and now your system will boot correctly and all
your drives will be visible in windows and disk management. no need to
replace your motherboard. unfortunately i spent two hours with tech
support and they did not know this either.
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