SG_SAT_IDENTIFY(8)						     SG3_UTILS							SG_SAT_IDENTIFY(8)

NAME

       sg_sat_identify - sends a ATA IDENTIFY (PACKET) DEVICE command via a SCSI to ATA Translation (SAT) layer

SYNOPSIS

       sg_sat_identify [--ck_cond] [--extend] [--help] [--hex] [--indent] [--len=16|12] [--packet] [--raw] [--verbose] [--version] DEVICE

DESCRIPTION

       This  utility  sends either an ATA IDENTIFY DEVICE command or an ATA IDENTIFY PACKET DEVICE command to DEVICE and outputs the response. The
       devices that respond to these commands are ATA disks and ATAPI devices respectively.  Rather than  send	these  commands  directly  to  the
       device  they  are sent via a SCSI transport which is assumed to contain a SCSI to ATA Translation (SAT) Layer (SATL). The SATL may be in an
       operating system driver, in host bus adapter firmware or in some external enclosure.

       The SAT standard (SAT ANSI INCITS 431-2007, prior draft: sat-r09.pdf at www.t10.org) defines two  SCSI  "ATA  PASS-THROUGH"  commands:  one
       using  a  16 byte "cdb" and the other with a 12 byte cdb. This utility defaults to using the 16 byte cdb variant. SAT-2 is also a standard:
       SAT-2 ANSI INCITS 465-2010 and the draft prior to that is sat2r09.pdf . The SAT-3  project  has	started  and  the  most  recent  draft	is
       sat3r01.pdf .

OPTIONS

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

       -c, --ck_cond
	      sets the CK_COND bit in the ATA PASS-THROUGH SCSI cdb. The default setting is clear (i.e. 0). When set the SATL should yield a sense
	      buffer containing a ATA Result descriptor irrespective of whether the command succeeded or failed. When clear the SATL  should  only
	      yield a sense buffer containing a ATA Result descriptor if the command failed.

       -e, --extend
	      sets  the  EXTEND bit in the ATA PASS-THROUGH SCSI cdb. The default setting is clear (i.e. 0). When set a 48 bit LBA command is sent
	      to the device. This option has no effect when --len=12.

       -h, --help
	      outputs the usage message summarizing command line options then exits. Ignores DEVICE if given.

       -H, --hex
	      outputs the ATA IDENTIFY (PACKET) DEVICE response in hex. The default action (i.e. without  any  '-H'  options)  is  to  output  the
	      response in hex, grouped in 16 bit words (i.e. the ATA standard's preference).  When given once, the response is output in ASCII hex
	      bytes (i.e. the SCSI standard's preference). When given twice (i.e. '-HH') the output is in hex, grouped in 16 bit words,  the  same
	      as the default but without a header. When given thrice (i.e. '-HHH') the output is in hex, grouped in 16 bit words, in a format that
	      is acceptable for 'hdparm --Istdin' to process.

       -i, --indent
	      outputs the World Wide Name (WWN) of the device. This should be a NAA-5 64 bit number. It is output in hex prefixed  with  "0x".	If
	      not  available  then  "0x0000000000000000"  is output. The equivalent for a SCSI disk (i.e. its logical unit name) can be found with
	      "sg_vpd -ii".

       -l, --len=16 | 12
	      this is the length of the SCSI cdb used for the ATA PASS-THROUGH commands.  The argument can either be 16 or 12. The default is  16.
	      The  larger  cdb	size is needed for 48 bit LBA addressing of ATA devices. On the other hand some SCSI transports cannot convey SCSI
	      commands longer than 12 bytes.

       -p, --packet
	      send an ATA IDENTIFY PACKET DEVICE command (via the SATL). The default action is to send an ATA IDENTIFY DEVICE command.

       -r, --raw
	      output the ATA IDENTIFY (PACKET) DEVICE response in binary. The output should be piped to a file or another utility when this option
	      is used.	The binary is sent to stdout, and errors are sent to stderr.

       -v, --verbose
	      increases the level or verbosity.

       -V, --version
	      print out version string

NOTES

       Since the response to the IDENTIFY (PACKET) DEVICE command is very important for the correct use of an ATA(PI) device (and is typically the
       first command sent), a SATL should provide an ATA Information VPD page which contains the similar information.

       The SCSI ATA PASS-THROUGH (12) command's opcode is 0xa1 and it clashes with the MMC set's BLANK command used by cd/dvd writers. So  a  SATL
       in front of an ATAPI device that uses MMC (i.e. has peripheral device type 5) probably should treat opcode 0xa1 as a BLANK command and send
       it through to the cd/dvd drive. The ATA PASS-THROUGH (16) command's opcode (0x85) does not clash with anything so it is a better choice.

       In the 2.4 series of Linux kernels the DEVICE must be a SCSI generic (sg) device. In the 2.6 series block devices  (e.g.  disks	and  ATAPI
       DVDs)  can  also  be  specified.  For example "sg_inq /dev/sda" will work in the 2.6 series kernels. From lk 2.6.6 other SCSI "char" device
       names may be used as well (e.g. "/dev/st0m"). Prior to lk 2.6.29 USB mass storage limited sense data to 18 bytes which made  the  --ck_cond
       option yield strange (truncated) results.

EXIT STATUS

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

AUTHOR

       Written by Doug Gilbert

REPORTING BUGS

       Report bugs to <dgilbert at interlog dot com>.

COPYRIGHT

       Copyright (C) 2006-2011 Douglas Gilbert
       This  software  is distributed under a FreeBSD license. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR-
       POSE.

SEE ALSO

       sg_vpd(sg3_utils), sg_inq(sg3_utils), sdparm(sdparm), hdparm(hdparm)

sg3_utils-1.32							     May 2011							SG_SAT_IDENTIFY(8)