NAME

SYNOPSIS

DESCRIPTION

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

-c, --count=CO

the number CO is placed in the "count" field in the ATA SET FEATURES 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 irrespective 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 common 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 FEATURES 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

EXIT STATUS

AUTHOR

REPORTING BUGS

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SEE ALSO