1SG_SAT_IDENTIFY(8) SG3_UTILS SG_SAT_IDENTIFY(8)
2
6 sg_sat_identify - send ATA IDENTIFY DEVICE command via SCSI to ATA
7 Translation (SAT) layer
8
10 sg_sat_identify [--ck_cond] [--extend] [--help] [--hex] [--indent]
11 [--len={16|12}] [--packet] [--raw] [--readonly] [--verbose] [--version]
12 DEVICE
13
15 This utility sends either an ATA IDENTIFY DEVICE command or an ATA
16 IDENTIFY PACKET DEVICE command to DEVICE and outputs the response. The
17 devices that respond to these commands are ATA disks and ATAPI devices
18 respectively. Rather than send these commands directly to the device
19 they are sent via a SCSI transport which is assumed to contain a SCSI
20 to ATA Translation (SAT) Layer (SATL). The SATL may be in an operating
21 system driver, in host bus adapter firmware or in some external enclo‐
22 sure.
23 The SAT standard (SAT ANSI INCITS 431-2007, prior draft: sat-r09.pdf at
25 www.t10.org) defines two SCSI "ATA PASS-THROUGH" commands: one using a
26 16 byte "cdb" and the other with a 12 byte cdb. This utility defaults
27 to using the 16 byte cdb variant. SAT-2 is also a standard: SAT-2 ANSI
28 INCITS 465-2010 and the draft prior to that is sat2r09.pdf . The SAT/-3
29 project has started and the most recent draft is sat3r01.pdf .
30
32 Arguments to long options are mandatory for short options as well.
33 -c, --ck_cond
35 sets the CK_COND bit in the ATA PASS-THROUGH SCSI cdb. The
36 default setting is clear (i.e. 0). When set the SATL should
37 yield a sense buffer containing a ATA Result descriptor irre‐
38 spective of whether the command succeeded or failed. When clear
39 the SATL should only yield a sense buffer containing a ATA
40 Result descriptor if the command failed.
41 -e, --extend
43 sets the EXTEND bit in the ATA PASS-THROUGH SCSI cdb. The
44 default setting is clear (i.e. 0). When set a 48 bit LBA command
45 is sent to the device. This option has no effect when --len=12.
46 -h, --help
48 outputs the usage message summarizing command line options then
49 exits. Ignores DEVICE if given.
50 -H, --hex
52 outputs the ATA IDENTIFY (PACKET) DEVICE response in hex. The
53 default action (i.e. without any '-H' options) is to output the
54 response in hex, grouped in 16 bit words (i.e. the ATA stan‐
55 dard's preference). When given once, the response is output in
56 ASCII hex bytes (i.e. the SCSI standard's preference). When
57 given twice (i.e. '-HH') the output is in hex, grouped in 16 bit
58 words, the same as the default but without a header. When given
59 thrice (i.e. '-HHH') the output is in hex, grouped in 16 bit
60 words, in a format that is acceptable for 'hdparm --Istdin' to
61 process. '-HHHH' simply outputs hex data bytes, space separated,
62 16 per line.
63 -i, --indent
65 outputs the World Wide Name (WWN) of the device. This should be
66 a NAA-5 64 bit number. It is output in hex prefixed with "0x".
67 If not available then "0x0000000000000000" is output. The equiv‐
68 alent for a SCSI disk (i.e. its logical unit name) can be found
69 with "sg_vpd -ii".
70 -l, --len={16|12}
72 this is the length of the SCSI cdb used for the ATA PASS-THROUGH
73 commands. The argument can either be 16 or 12. The default is
74 16. The larger cdb size is needed for 48 bit LBA addressing of
75 ATA devices. On the other hand some SCSI transports cannot con‐
76 vey SCSI commands longer than 12 bytes.
77 -p, --packet
79 send an ATA IDENTIFY PACKET DEVICE command (via the SATL). The
80 default action is to send an ATA IDENTIFY DEVICE command.
81 -r, --raw
83 output the ATA IDENTIFY (PACKET) DEVICE response in binary. The
84 output should be piped to a file or another utility when this
85 option is used. The binary is sent to stdout, and errors are
86 sent to stderr.
87 -R, --readonly
89 open the DEVICE read-only (e.g. in Unix with the O_RDONLY flag).
90 The default is to open it read-write.
91 -v, --verbose
93 increases the level or verbosity.
94 -V, --version
96 print out version string
97
99 Since the response to the IDENTIFY (PACKET) DEVICE command is very
100 important for the correct use of an ATA(PI) device (and is typically
101 the first command sent), a SATL should provide an ATA Information VPD
102 page which contains the similar information.
103 The SCSI ATA PASS-THROUGH (12) command's opcode is 0xa1 and it clashes
105 with the MMC set's BLANK command used by cd/dvd writers. So a SATL in
106 front of an ATAPI device that uses MMC (i.e. has peripheral device type
107 5) probably should treat opcode 0xa1 as a BLANK command and send it
108 through to the cd/dvd drive. The ATA PASS-THROUGH (16) command's opcode
109 (0x85) does not clash with anything so it is a better choice.
110 Prior to Linux kernel 2.6.29 USB mass storage limited sense data to 18
112 bytes which made the --ck_cond option yield strange (truncated)
113 results.
114
116 The exit status of sg_sat_identify is 0 when it is successful. Other‐
117 wise see the sg3_utils(8) man page.
118
120 Written by Douglas Gilbert
121
123 Report bugs to <dgilbert at interlog dot com>.
124
126 Copyright © 2006-2014 Douglas Gilbert
127 This software is distributed under a FreeBSD license. There is NO war‐
128 ranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR‐
129 POSE.
130
132 sg_vpd(sg3_utils), sg_inq(sg3_utils), sdparm(sdparm), hdparm(hdparm)
133sg3_utils-1.40 November 2014 SG_SAT_IDENTIFY(8)