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

Provided by: sg3-utils_1.36-1ubuntu1_amd64

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]  [--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 Douglas Gilbert

REPORTING BUGS

       Report bugs to <dgilbert at interlog dot com>.

COPYRIGHT

       Copyright © 2006-2012 Douglas Gilbert
       This  software is distributed under a FreeBSD license. There is NO warranty; not even for MERCHANTABILITY
       or FITNESS FOR A PARTICULAR PURPOSE.