man pages section 1M: System Administration Commands

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Updated: July 2014

sg_sat_identify (1m)


sg_sat_identify - mand via a SCSI to ATA Translation (SAT) layer


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


SG3_UTILS                                      SG_SAT_IDENTIFY(8)

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

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

     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  oper-
     ating 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   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 .

     Arguments to long options are mandatory for short options as

     -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.

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SG3_UTILS                                      SG_SAT_IDENTIFY(8)

     -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

     See   attributes(5)   for   descriptions  of  the  following

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SG3_UTILS                                      SG_SAT_IDENTIFY(8)

     |Availability   | system/storage/sg3_utils |
     |Stability      | Uncommitted              |
     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 simi-
     lar 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

     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 lim-
     ited  sense data to 18 bytes which made the --ck_cond option
     yield strange (truncated) results.

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

     Written by Doug Gilbert

     Report bugs to <dgilbert at interlog dot com>.

     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

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

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SG3_UTILS                                      SG_SAT_IDENTIFY(8)

     This  software  was   built   from   source   available   at    The  original
     community       source       was       downloaded       from

     Further  information about this software can be found on the
     open        source        community        website        at

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