1SG_SAT_SET_FEATURES(8) SG3_UTILS SG_SAT_SET_FEATURES(8)
2
6 sg_sat_set_features - sends a ATA SET FEATURES command via a SCSI to
7 ATA Translation (SAT) layer
8
10 sg_sat_set_features [--count=CO] [--chk_cond] [--feature=FEA] [--help]
11 [--len=16|12] [--lba=LBA] [--verbose] [--version] DEVICE
12
14 This utility sends an ATA SET FEATURES command to the DEVICE. This
15 command is used to change settings of ATA non-packet (i.e. disks) and
16 packet devices (e.g. cd/dvd drives). Rather than send the SET FEATURES
17 command directly to the device it is sent via a SCSI transport which is
18 assumed to contain a SCSI to ATA Translation (SAT) Layer (SATL). The
19 SAT standard (SAT ANSI INCITS 431-2007; prior draft: sat-r09.pdf at
20 www.t10.org) defines two SCSI "ATA PASS-THROUGH" commands: one using a
21 16 byte "cdb" and the other with a 12 byte cdb. This utility defaults
22 to the 16 byte cdb variant.
23 The SATL may be in an operating system driver, in host bus adapter
25 firmware or in some external enclosure.
26 The features can be read using the sg_sat_identify utility which uses
28 either the ATA IDENTIFY DEVICE (for non-packet devices) or the IDENTIFY
29 PACKET DEVICE (for packet devices) command.
30
32 Arguments to long options are mandatory for short options as well.
33 -c, --count=CO
35 the number CO is placed in the "count" field in the ATA SET FEA‐
36 TURES command. Only some subcommands (a term used for the value
37 placed in the "feature" field) require the count field to be
38 set. The default value placed in the "count" field is 0.
39 -C, --chk_cond
41 sets the CK_COND bit in the ATA PASS-THROUGH SCSI cdb. The
42 default setting is clear (i.e. 0). When set the SATL should
43 yield a sense buffer containing a ATA Result descriptor irre‐
44 spective of whether the ATA command succeeded or failed. When
45 clear the SATL should only yield a sense buffer containing a ATA
46 Result descriptor if the ATA command failed.
47 -f, --feature=FEA
49 the value FEA is placed in the "feature" field in the ATA SET
50 FEATURES command. The term "subcommand" is sometimes used for
51 this value. The default value placed in the "feature" field is 0
52 which is reserved and hence should not change anything. Two com‐
53 mon examples are 2h to enable the write cache and 82h to disable
54 it.
55 -h, --help
57 outputs the usage message summarizing command line options then
58 exits. Ignores DEVICE if given.
59 -l, --len=16 | 12
61 this is the length of the SCSI cdb used for the ATA PASS-THROUGH
62 commands. The argument can either be 16 or 12. The default is
63 16. Some SCSI transports cannot convey SCSI commands longer than
64 12 bytes.
65 -L, --lba=LBA
67 the number LBA is placed in the "lba" field in the ATA SET FEA‐
68 TURES command. Only some subcommands (a term used for the value
69 placed in the "feature" field) require the lba field to be set.
70 This value is not a "logical block address" as the acronym might
71 imply. The default value placed in the "lba" field is 0.
72 -v, --verbose
74 increases the level or verbosity.
75 -V, --version
77 print out version string
78
80 In the 2.4 series of Linux kernels the DEVICE must be a SCSI generic
81 (sg) device. In the 2.6 series block devices (e.g. disks and ATAPI
82 DVDs) can also be specified. For example "sg_inq /dev/sda" will work in
83 the 2.6 series kernels. From lk 2.6.6 other SCSI "char" device names
84 may be used as well (e.g. "/dev/st0m").
85
87 The exit status of sg_sat_set_features is 0 when it is successful. Oth‐
88 erwise see the sg3_utils(8) man page.
89
91 Written by Doug Gilbert
92
94 Report bugs to <dgilbert at interlog dot com>.
95
97 Copyright © 2007 Douglas Gilbert
98 This software is distributed under a FreeBSD license. There is NO war‐
99 ranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR‐
100 POSE.
101
103 sg_sat_identify(sg3_utils), sg_inq(sg3_utils), sdparm(sdparm),
104 hdparm(hdparm)
105sg3_utils-1.25 August 2007 SG_SAT_SET_FEATURES(8)