I actually have a DELL laptop with a 100GB M.2 SSD with windows 10. All the OS partitions are in that disk. Also, the computer have a regular 1TB 7200r HDD that is used for DATA.
What I want to know:
If I buy another M.2 SSD, would I be able to install any other OS(example, Linux mint) without any problem and keep using the DATA HDD?
And Would I be able to go back to normal(boot with W10) if I just switch to the original M.2 SSD again?