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SG_WRITE_BUFFER(8)			    SG3_UTILS			       SG_WRITE_BUFFER(8)

NAME
       sg_write_buffer - send a SCSI WRITE BUFFER command

SYNOPSIS
       sg_write_buffer	[--help]  [--id=ID] [--in=FILE] [--length=LEN] [--mode=MO] [--offset=OFF]
       [--raw] [--skip=SKIP] [--verbose] [--version] DEVICE

DESCRIPTION
       Sends a SCSI WRITE BUFFER command to DEVICE, along with data provided by the user. In some
       cases  no  data	is  required,  or  data  can be read from the file given in the --in=FILE
       option, or data is read from stdin when either --raw or --in=- is given.

       Some WRITE BUFFER command variants do not have associated data to send to the device,  for
       example "activate_mc" ("activate deferred microcode").

OPTIONS
       Arguments to long options are mandatory for short options as well.

       -h, --help
	      output  the  usage  message  then exit. If used multiple times also prints the mode
	      names and their acronyms.

       -i, --id=ID
	      this option sets the buffer id field in the cdb. ID is a value between 0	(default)
	      and 255 inclusive.

       -I, --in=FILE
	      read  data from file FILE that will be sent with the WRITE BUFFER command.  If FILE
	      is '-' then stdin is read until an EOF is detected (this	is  the  same  action  as
	      --raw).

       -l, --length=LEN
	      where  LEN  is  the  length, in bytes, of data to be written to the device.  If not
	      given (and length cannot be deduced from --in=FILE or --raw) then defaults to zero.
	      If  the  option is given and the length deduced from --in=FILE or --raw is less (or
	      no data is provided), then bytes of 0xff are used as fill bytes.

       -m, --mode=MO
	      this option sets the mode field in the cdb. MO is a value between 0  (default)  and
	      31  inclusive.  Alternatively  an abbreviation can be given.  To list the available
	      mode abbreviations give an invalid one (e.g. '--mode=xxx') or use the '-hh' option.

       -o, --offset=OFF
	      this option sets the buffer offset field in the cdb.  OFF  is  a	value  between	0
	      (default) and 2**24-1 . It is a byte offset.

       -r, --raw
	      read  data  from	stdin  until an EOF is detected. This data is sent with the WRITE
	      BUFFER command to DEVICE. The action of this option is the same as using '--in=-'.

       -s, --skip=SKIP
	      this option is only active when --in=FILE is given and  FILE  is	a  regular  file,
	      rather than stdin. Data is read starting at byte offset SKIP to the end of file (or
	      the amount given by --length=LEN). If not given the byte offset defaults to 0 (i.e.
	      the start of the file).

       -v, --verbose
	      increase the level of verbosity, (i.e. debug output).

       -V, --version
	      print the version string and then exit.

NOTES
       If  no  --length=LEN  is  given this utility reads up to 8 MiB of data from the given file
       FILE (or stdin). If a larger amount of data  is	required  then	the  --length=LEN  option
       should  be  given. The user should be aware that most operating systems have limits on the
       amount of data that can be sent with one SCSI command. In Linux this depends on	the  pass
       through mechanism used (e.g. block SG_IO or the sg driver) and various setting in sysfs in
       the linux lk 2.6 series (e.g. /sys/block/sda/queue/max_sectors_kb).

       Downloading incorrect microcode into a device has the ability to render that device  inop-
       erable.	One  would hope that the device vendor verifies the data before activating it. If
       the SCSI WRITE BUFFER command is given values in its cdb (e.g. LEN) that are inappropriate
       (e.g. too large) then the device should respond with a sense key of ILLEGAL REQUEST and an
       additional sense code of INVALID FIELD in CDB. If a WRITE BUFFER command (or a sequence of
       them)  fails  due to device vendor verification checks then it should respond with a sense
       key of ILLEGAL REQUEST and an additional sense code of COMMAND SEQUENCE ERROR.

       All numbers given with options are assumed to be decimal.  Alternatively numerical  values
       can  be	given  in  hexadecimal	preceded by either "0x" or "0X" (or has a trailing "h" or
       "H").

EXIT STATUS
       The exit status of  sg_write_buffer  is	0  when  it  is  successful.  Otherwise  see  the
       sg3_utils(8) man page.

AUTHORS
       Written by Luben Tuikov and Douglas Gilbert.

REPORTING BUGS
       Report bugs to <dgilbert at interlog dot com>.

COPYRIGHT
       Copyright (C) 2006-2007 Luben Tuikov and Douglas Gilbert
       This  software  is distributed under a FreeBSD license. There is NO warranty; not even for
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

SEE ALSO
       sg_read_buffer(sg3_utils)

sg3_utils-1.23				   January 2007 		       SG_WRITE_BUFFER(8)
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