man > sg_sat_identify(8)

SG_SAT_IDENTIFY(8)                            SG3_UTILS                           SG_SAT_IDENTIFY(8)

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

SYNOPSIS
       sg_sat_identify  [--ck_cond]  [--extend]  [--help]  [--hex] [--ident] [--len=CLEN] [--packet]
       [--raw] [--readonly] [--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 Transla‐
       tion (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-4 revision 5 added a SCSI
       "ATA PASS-THROUGH(32)" command. SAT-2 and SAT-3 are now also  standards:  SAT-2  ANSI  INCITS
       465-2010  and  SAT-3 ANSI INCITS 517-2015 . The SAT-4 project is near standardization and the
       most recent draft is sat4r06.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 de‐
              scriptor 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 ef‐
              fect 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. '-HHHH'  simply  out‐
              puts hex data bytes, space separated, 16 per line.

       -i, --ident
              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=CLEN
              CLEN  this  is the length of the SCSI cdb used for the ATA PASS-THROUGH command.  CLEN
              can either be 12, 16 or 32. The default is 16. The larger cdb sizes are needed for  48
              bit  LBA  addressing of ATA devices. The ATA Auxiliary and ICC registers are only con‐
              veyed with the 32 byte cdb variant.

       -p, --packet
              send an ATA IDENTIFY PACKET DEVICE command (via the SATL). The default  action  is  to
              send  an  ATA  IDENTIFY DEVICE command. Note that the ATAPI specification by T13 (i.e.
              the PACKET interface) is now obsolete.

       -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

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.

       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) results.

EXAMPLES
       These  examples use Linux device names and a Linux utility called hdparm. For suitable device
       names in other supported Operating Systems see the sg3_utils(8) man page.

       In this example /dev/sdb is a SATA 2.5" disk connected via a USB (type  C  connector)  dongle
       that  implements the UAS (USB attached SCSI) protocol (also known as UASP). UAS is a vast im‐
       provement over the USB mass storage class.

           # sg_sat_identify /dev/sdb
       Response for IDENTIFY DEVICE ATA command:
        00   0c5a 3fff c837 0010 0000 0000 003f 0000  .Z ?. .7 .. .. .. .? ..
        ....

       The hexadecimal ASCII (with plain ASCII to the right) output is abridged  to  a  single  line
       (i.e.  the  first  16  bytes (or 8 words)). Now to decode some of that ATA Identify response.
       First sg_inq can decode a few strings:

           # sg_sat_identify -HHHH /dev/sdb | sg_inq --ata -I -
       ATA device: model, serial number and firmware revision:
         ST9500420AS     5VJCE6R7 0002SDM1

       For a lot more details, the hdparm utility is a good choice:

           # sg_sat_identify -HHH /dev/sdb | hdparm --Istdin
       ATA device, with non-removable media
               Model Number:       ST9500420AS
               Serial Number:      5VJCE6R7
               Firmware Revision:  0002SDM1
               Transport:          Serial
       Standards:
        ....

       There are about 80 more lines of details decoded by hdparm in this case.  Notice the  differ‐
       ence in the number of "H" options: three give an unadorned hex output arranged in (little en‐
       dian)  words (i.e. 16 bits each) while four "H" options give an unadorned hex output in bytes
       (i.e. 8 bits each).

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 Douglas Gilbert

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

COPYRIGHT
       Copyright © 2006-2020 Douglas Gilbert
       This software is distributed under a FreeBSD license. There is NO warranty; not even for MER‐
       CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

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

sg3_utils-1.45                              January 2020                          SG_SAT_IDENTIFY(8)