SG3UTILS SGSATIDENTIFY(1M)
NAME
sgsatidentify - sends a ATA IDENTIFY (PACKET) DEVICE com-
mand via a SCSI to ATA Translation (SAT) layer
SYNOPSIS
sgsatidentify [--ckcond] [--extend] [--help] [--hex]
[--len=1612] [--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 SAT standard (SAT ANSI
INCITS 431-2007, prior draft: sat-r09.pdf at www.t10.org)
defines two SCSI "ATA PAS-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.
The SATL may be in an operating system driver, in host bus
adapter firmware or in some external enclosure.
OPTIONS
Arguments to long options are mandatory for short options as
well.
-c, --ckcond
sets the CKCOND bit in the ATA PAS-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 PAS-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
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SG3UTILS SGSATIDENTIFY(1M)
words (i.e. the ATA standard's preference). When given
once, the response is output in ASCI hex bytes (i.e.
the SCSI standard's preference). When given twice (i.e.
'-H') the output is in hex, grouped in 16 bit words,
the same as the default but without a header. When
given thrice (i.e. '-H') the output is in hex,
grouped in 16 bit words, in a format that is acceptable
for 'hdparm --Istdin' to process.
-l, --len=16 12
this is the length of the SCSI cdb used for the ATA
PAS-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 simi-
lar information.
The SCSI ATA PAS-THROUGH (12) command's opcode is 0xa1 and
it clashes with the MC set's BLANK command used by cd/dvd
writers. So a SATL in front of an ATAPI device that uses MC
(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 PAS-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.
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SG3UTILS SGSATIDENTIFY(1M)
disks and ATAPI DVDs) can also be specified. For example
"sginq /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").
EXIT STATUS
The exit status of sgsatidentify is 0 when it is success-
ful. Otherwise see the sg3utils(1M) man page.
AUTHOR
Written by Doug Gilbert
REPORTING BUGS
Report bugs to .
COPYRIGHT
Copyright O 2006-2007 Douglas Gilbert
This software is distributed under a FreeBSD license. There
is NO warranty; not even for MERCHANTABILITY or FITNES FOR
A PARTICULAR PURPOSE.
SEE ALSO
sgvpd(sg3utils), sginq(sg3utils), sdparm(sdparm),
hdparm(hdparm)
ATRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
ATRIBUTE TYPE ATRIBUTE VALUE
Availability SUNWsg3utilsu
Interface Stability Committed
NOTES
Source for sg3utils is available on http:/opensolaris.org.
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