How to understand and mix Secure Boot, CSM and NVMe SSD?

Fero

n00b
Joined
Jul 24, 2016
Messages
55
Hello. It was hard to find any info about proper windows installation on pci-e ssd, and I still have some questions, maybe somebody can halp me to understand.
I've installed Win10 to M.2 NVMe with CSM fully disabled, cleared keys and secure boot at "other OS". Question is - can I boot from other drive to win 7 and return back without "losing keys" or any other issue? Maybe i need to save keys to portable drive? And do I need to enable CSM back in order to boot up win7 (it was on when I installed os). And about win10, maybe I need to switch from "other OS" to "Windows Secure boot"? Any links with usefull info will be very appreciated.
 
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