sg_sat_set_features man page on DragonFly
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SG_SAT_SET_FEATURES(8) SG3_UTILS SG_SAT_SET_FEATURES(8)
NAME
sg_sat_set_features - use ATA SET FEATURES command via a SCSI to ATA
Translation (SAT) layer
SYNOPSIS
sg_sat_set_features [--count=CO] [--ck_cond] [--extended] [--fea‐
ture=FEA] [--help] [--lba=LBA] [--len={16|12}] [--readonly] [--verbose]
[--version] DEVICE
DESCRIPTION
This utility sends an ATA SET FEATURES command to the DEVICE. This
command is used to change settings of ATA non-packet (i.e. disks) and
packet devices (e.g. cd/dvd drives). Rather than send the SET FEATURES
command directly to the device it is 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 sat3r05b.pdf .
The features can be read using the sg_sat_identify utility which uses
either the ATA IDENTIFY DEVICE (for non-packet devices) or the IDENTIFY
PACKET DEVICE (for packet devices) command.
OPTIONS
Arguments to long options are mandatory for short options as well.
-c, --count=CO
the number CO is placed in the "count" field in the ATA SET FEA‐
TURES command. Only some subcommands (a term used for the value
placed in the "feature" field) require the count field to be
set. The default value placed in the "count" field is 0.
-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 irre‐
spective of whether the ATA command succeeded or failed. When
clear the SATL should only yield a sense buffer containing a ATA
Result descriptor if the ATA command failed.
-e, --extended
allow for extended LBA numbers (i.e. larger than 32 bits). This
value is enabled automatically for large LBA numbers, but can be
enabled explicitly even for low LBA numbers with this option.
-f, --feature=FEA
the value FEA is placed in the "feature" field in the ATA SET
FEATURES command. The term "subcommand" is sometimes used for
this value. The default value placed in the "feature" field is 0
which is reserved and hence should not change anything. Two com‐
mon examples are 2h to enable the write cache and 82h to disable
it.
-h, --help
outputs the usage message summarizing command line options then
exits. Ignores DEVICE if given.
-L, --lba=LBA
the number LBA is placed in the "lba" field of the ATA SET FEA‐
TURES command. Only some sub-commands (a term used for the value
placed in the "feature" field) require the lba field to be set.
This value is typically not a "logical block address" as the
acronym might imply. The default value placed in the "lba"
field is 0. The maximum value allowed for LBA is 0xfffffffe (or
0xffffff if --len=12).
-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. Some SCSI transports cannot convey SCSI commands longer than
12 bytes.
-r, --readonly
causes the DEVICE to be opened with the read-only flag (O_RDONLY
in Unix). The default action is to open DEVICE with the
read-write flag (O_RDWR in Unix). In some cases sending power
management commands to ATA disks are defeated by OS actions on
the close() if the DEVICE was opened with the read-write flag
(e.g. the OS might think it needs to flush something to disk).
-v, --verbose
increases the level or verbosity.
-V, --version
print out version string
NOTES
In the 2.4 series of Linux kernels the DEVICE must be a SCSI generic
(sg) device. In the 2.6 and 3 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_set_features is 0 when it is successful. Oth‐
erwise see the sg3_utils(8) man page.
AUTHOR
Written by Douglas Gilbert
REPORTING BUGS
Report bugs to <dgilbert at interlog dot com>.
COPYRIGHT
Copyright © 2007-2014 Douglas Gilbert
This software is distributed under a FreeBSD license. There is NO war‐
ranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR‐
POSE.
SEE ALSO
sg_sat_identify(sg3_utils), sg_inq(sg3_utils), sdparm(sdparm),
hdparm(hdparm)
sg3_utils-1.40 November 2014 SG_SAT_SET_FEATURES(8)
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