DOS‐tips

Here's a tip about labels for your disks. (No, not the ones you stick on the outside of the disk.) I'm talking about the internal disk label (one for each disk) that DOS keeps track of. When you issue a DIRectory command at the DOS prompt, the resulting display begins with something like Volume in drive A is DATA25 or, more commonly, Volume in drive A has no label. What is this label and where did it come from?