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man pages section 8: System Administration Commands

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Updated: Thursday, June 13, 2019

sg_sat_identify (8)


sg_sat_identify - send ATA IDENTIFY DEVICE command via SCSI to ATA Translation (SAT) layer


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


SG_SAT_IDENTIFY(8)                 SG3_UTILS                SG_SAT_IDENTIFY(8)

       sg_sat_identify  -  send  ATA  IDENTIFY  DEVICE command via SCSI to ATA
       Translation (SAT) layer

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

       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  enclo-

       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 .

       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  irre-
              spective  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  stan-
              dard'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. '-HHHH' simply outputs hex data bytes, space separated,
              16 per line.

       -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 equiv-
              alent  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 con-
              vey 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.

       -R, --readonly
              open the DEVICE read-only (e.g. in Unix with the O_RDONLY flag).
              The default is to open it read-write.

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

       -V, --version
              print out version string

       See attributes(7) for descriptions of the following attributes:

       |Availability   | system/storage/sg3_utils |
       |Stability      | Pass-through 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 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.

       Prior  to Linux kernel 2.6.29 USB mass storage limited sense data to 18
       bytes  which  made  the  --ck_cond  option  yield  strange  (truncated)

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

       Written by Douglas Gilbert

       Report bugs to <dgilbert at interlog dot com>.

       Copyright (C) 2006-2014 Douglas Gilbert
       This software is distributed under a FreeBSD license. There is NO  war-
       ranty;  not  even  for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR-

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

       This    software    was    built    from    source     available     at
       https://github.com/oracle/solaris-userland.    The  original  community
       source was downloaded from  http://sg.danny.cz/sg/p/sg3_utils-1.42.tgz

       Further information about this software can be found on the open source
       community website at http://sg.danny.cz/sg/sg3_utils.html.

sg3_utils-1.40                   November 2014              SG_SAT_IDENTIFY(8)