TAPE Command
Use the DVOL1 function of the TAPE command to display the VOL1 label of a tape on your terminal. You can use this command to ensure the system operator has mounted the correct tape before you begin processing the tape. If the tape does not have a VOL1 label and you enter the TAPE command, you are informed that the VOL1 label is missing.
Do not use TAPE DVOL1 if you have a blank tape. If TAPE DVOL1 is entered and a blank tape is used, CMS will search the entire tape to find the label record; because the tape is void of any records, the tape will run off the end of the reel in a reel tape, or you will get an error message with a cartridge tape.
Use the WVOL1 function on the TAPE command to write a VOL1 label on a tape. You can specify a one-to-six character volume ID (volid) through this command and also a one-to-eight character owner field.