DOS Command Label
Type: External (3.0 and later)
			
			Syntax:
			
			LABEL [d:][volume label]
			
			Purpose: Creates or changes or deletes a volume label for a 
			disk.
			
			Discussion
			
			A volume label may consist of up to eleven characters (the same 
			characters that are legal for a file name). If you enter an 
			erroneous volume label, the error message Invalid volume label 
			appears, and the system prompts for a re-entry.
			
			If you use this command without entering a volume label, the program 
			displays
			
			Input volume label - Up to 11 characters.
			Press ENTER only to delete label.
			
			Enter a volume label, or press the Enter key to delete the current 
			volume label. To display the current label, use either the DIR or 
			VOL command.
			
			Example
			
			To create the label TESTVOL1-A on the diskette in drive B, enter
			
			label b:testvol1-a
			 
This page is from http://www.easydos.com. I pasted it on my website to avoid possible broken links. For further help with DOS commands, Check easydos.com out.
