A while ago I decided to get an extra m.2 drive and put Linux Mint on it to try and switch off Windows. I unplugged the original drive, plugged in the new one, put Mint on it, then put the old drive back in. This has allowed me to dual-boot. However, Ive since fully committed to the Linux drive and haven’t used the Windows drive in a long time. How do I put Linux on both drives?

I would like to fully encrypt both drives since I dont think I did that when I installed Mint. I would also rather have the original drive as the main drive again because I think it’s in a faster slot for the motherboard. Is there a way to make this change without a fresh install? I could probably backup most of my important data to a flash drive but I’d rather not. (I’m fully ok with losing everything on the Windows drive though).