Usage: sg_write_buffer [--bpw=CS] [--dry-run] [--help] [--id=ID] [--in=FILE]
                       [--length=LEN] [--mode=MO] [--offset=OFF]
                       [--read-stdin] [--skip=SKIP] [--specific=MS]
                       [--timeout=TO] [--verbose] [--version] DEVICE
  where:
    --bpw=CS|-b CS         CS is chunk size: bytes per write buffer
                           command (def: 0 -> as many as possible)
    --dry-run|-d           skip WRITE BUFFER commands, do everything else
    --help|-h              print out usage message then exit
    --id=ID|-i ID          buffer identifier (0 (default) to 255)
    --in=FILE|-I FILE      read from FILE ('-I -' read from stdin)
    --length=LEN|-l LEN    length in bytes to write; may be deduced from
                           FILE
    --mode=MO|-m MO        write buffer mode, MO is number or acronym
                           (def: 0 -> 'combined header and data' (obs))
    --offset=OFF|-o OFF    buffer offset (unit: bytes, def: 0)
    --read-stdin|-r        read from stdin (same as '-I -')
    --skip=SKIP|-s SKIP    bytes in file FILE to skip before reading
    --specific=MS|-S MS    mode specific value; 3 bit field (0 to 7)
    --timeout=TO|-t TO     command timeout in seconds (def: 300)
    --verbose|-v           increase verbosity
    --version|-V           print version string and exit

Performs one or more SCSI WRITE BUFFER commands. Use '-m xxx' to list
available modes. A chunk size of 4 KB ('--bpw=4k') seems to work well.
Example: sg_write_buffer -b 4k -I xxx.lod -m 7 /dev/sg3