Might be too late for this, and not necessarily what you asked, but Id recommend also having a way to label them. Either on your phones notes app or a piece of paper (maybe in the case so you know where to find it?).
When I first set up my server I got an error message overnight saying one of the drives were messed up and it said "drive ID XXXXXXXX" , luckily I only had 3 drives so it was easy to know what is what, but I stole my sisters label maker and put their ID in a easier to read place on the drive cage.