Do I need to call chia plot remove, then add if I want to umount drive with plots for a while?

[ardabro]

I have a running node. Some plots are located on external drive.
Let's say I want to unmount it for a while, add new plots into it, then mount again.
Do I need to do remove, then add the plots directory via chia plots command or is it safe operation when my node is farming?
Do I need to do anything after I mount the drive again to inform node that new plots appeared in the directory or does it scan for new plots all the time?