I feel a bit embarrassed of asking this, but: I bought a new SSD to add to my desktop. (It will not replace anything, and it is not the system disk.) My plan was to add the SDD, boot, edit the fstab file (using UUID), format it, and copy some files to it, which is what I think I've done in the past.
My reluctance is that, if I remember well, systemd does not boot if fstab is not properly set (if I remember well), so I would not be able to follow my plan, unless I'd do it in rescue mode. Is that the case? If so, how do I boot in rescue mode?
Also, I might have to change some of the SATA cables around, but since the fstab is set using UUID, it should not be a problem, correct?