HP Unified Extensible Firmware Interface - Manual (Page 64)

shell> vol fs0 –n help_test
Volume HELP_TEST (rw)
1,457,664 bytes total disk space
1,149,440 bytes available on disk
512 bytes in each allocation unit
To delete the volume label of fs0:
fs0:\> vol fs0 -d
Volume has no label (rw)
1,457,664 bytes total disk space
220,160 bytes available on disk
512 bytes in each allocation unit
64 UEFI Shell command reference