1SG_SAT_IDENTIFY(8) SG3_UTILS SG_SAT_IDENTIFY(8)
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6 sg_sat_identify - send ATA IDENTIFY DEVICE command via SCSI to ATA
7 Translation (SAT) layer
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10 sg_sat_identify [--ck_cond] [--extend] [--help] [--hex] [--ident]
11 [--len={16|12}] [--packet] [--raw] [--verbose] [--version] DEVICE
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14 This utility sends either an ATA IDENTIFY DEVICE command or an ATA
15 IDENTIFY PACKET DEVICE command to DEVICE and outputs the response. The
16 devices that respond to these commands are ATA disks and ATAPI devices
17 respectively. Rather than send these commands directly to the device
18 they are sent via a SCSI transport which is assumed to contain a SCSI
19 to ATA Translation (SAT) Layer (SATL). The SATL may be in an operating
20 system driver, in host bus adapter firmware or in some external enclo‐
21 sure.
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23 The SAT standard (SAT ANSI INCITS 431-2007, prior draft: sat-r09.pdf at
24 www.t10.org) defines two SCSI "ATA PASS-THROUGH" commands: one using a
25 16 byte "cdb" and the other with a 12 byte cdb. This utility defaults
26 to using the 16 byte cdb variant. SAT-2 is also a standard: SAT-2 ANSI
27 INCITS 465-2010 and the draft prior to that is sat2r09.pdf . The SAT/-3
28 project has started and the most recent draft is sat3r01.pdf .
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31 Arguments to long options are mandatory for short options as well.
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33 -c, --ck_cond
34 sets the CK_COND bit in the ATA PASS-THROUGH SCSI cdb. The
35 default setting is clear (i.e. 0). When set the SATL should
36 yield a sense buffer containing a ATA Result descriptor irre‐
37 spective of whether the command succeeded or failed. When clear
38 the SATL should only yield a sense buffer containing a ATA
39 Result descriptor if the command failed.
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41 -e, --extend
42 sets the EXTEND bit in the ATA PASS-THROUGH SCSI cdb. The
43 default setting is clear (i.e. 0). When set a 48 bit LBA command
44 is sent to the device. This option has no effect when --len=12.
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46 -h, --help
47 outputs the usage message summarizing command line options then
48 exits. Ignores DEVICE if given.
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50 -H, --hex
51 outputs the ATA IDENTIFY (PACKET) DEVICE response in hex. The
52 default action (i.e. without any '-H' options) is to output the
53 response in hex, grouped in 16 bit words (i.e. the ATA stan‐
54 dard's preference). When given once, the response is output in
55 ASCII hex bytes (i.e. the SCSI standard's preference). When
56 given twice (i.e. '-HH') the output is in hex, grouped in 16 bit
57 words, the same as the default but without a header. When given
58 thrice (i.e. '-HHH') the output is in hex, grouped in 16 bit
59 words, in a format that is acceptable for 'hdparm --Istdin' to
60 process.
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62 -i, --ident
63 outputs the World Wide Name (WWN) of the device. This should be
64 a NAA-5 64 bit number. It is output in hex prefixed with "0x".
65 If not available then "0x0000000000000000" is output. The equiv‐
66 alent for a SCSI disk (i.e. its logical unit name) can be found
67 with "sg_vpd -ii".
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69 -l, --len={16|12}
70 this is the length of the SCSI cdb used for the ATA PASS-THROUGH
71 commands. The argument can either be 16 or 12. The default is
72 16. The larger cdb size is needed for 48 bit LBA addressing of
73 ATA devices. On the other hand some SCSI transports cannot con‐
74 vey SCSI commands longer than 12 bytes.
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76 -p, --packet
77 send an ATA IDENTIFY PACKET DEVICE command (via the SATL). The
78 default action is to send an ATA IDENTIFY DEVICE command.
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80 -r, --raw
81 output the ATA IDENTIFY (PACKET) DEVICE response in binary. The
82 output should be piped to a file or another utility when this
83 option is used. The binary is sent to stdout, and errors are
84 sent to stderr.
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86 -v, --verbose
87 increases the level or verbosity.
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89 -V, --version
90 print out version string
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93 Since the response to the IDENTIFY (PACKET) DEVICE command is very
94 important for the correct use of an ATA(PI) device (and is typically
95 the first command sent), a SATL should provide an ATA Information VPD
96 page which contains the similar information.
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98 The SCSI ATA PASS-THROUGH (12) command's opcode is 0xa1 and it clashes
99 with the MMC set's BLANK command used by cd/dvd writers. So a SATL in
100 front of an ATAPI device that uses MMC (i.e. has peripheral device type
101 5) probably should treat opcode 0xa1 as a BLANK command and send it
102 through to the cd/dvd drive. The ATA PASS-THROUGH (16) command's opcode
103 (0x85) does not clash with anything so it is a better choice.
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105 In the 2.4 series of Linux kernels the DEVICE must be a SCSI generic
106 (sg) device. In the 2.6 series block devices (e.g. disks and ATAPI
107 DVDs) can also be specified. For example "sg_inq /dev/sda" will work in
108 the 2.6 series kernels. From lk 2.6.6 other SCSI "char" device names
109 may be used as well (e.g. "/dev/st0m"). Prior to lk 2.6.29 USB mass
110 storage limited sense data to 18 bytes which made the --ck_cond option
111 yield strange (truncated) results.
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114 The exit status of sg_sat_identify is 0 when it is successful. Other‐
115 wise see the sg3_utils(8) man page.
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118 Written by Douglas Gilbert
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121 Report bugs to <dgilbert at interlog dot com>.
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124 Copyright © 2006-2013 Douglas Gilbert
125 This software is distributed under a FreeBSD license. There is NO war‐
126 ranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR‐
127 POSE.
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130 sg_vpd(sg3_utils), sg_inq(sg3_utils), sdparm(sdparm), hdparm(hdparm)
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134sg3_utils-1.37 June 2013 SG_SAT_IDENTIFY(8)