Usage: sg_rmsn   [--help] [--raw] [--readonly] [--verbose] [--version]
                 DEVICE
  where:
    --help|-h       print out usage message
    --raw|-r        output serial number to stdout (potentially binary)
    --readonly|-R    open DEVICE read-only (def: open it read-write)
    --verbose|-v    increase verbosity
    --version|-V    print version string and exit

Performs a SCSI READ MEDIA SERIAL NUMBER command