NAME

SYNOPSIS

DESCRIPTION

This utility does not currently attempt to decode the response from the ATA disk, rather it outputs the response in ASCII hexadecimal grouped in 16 bit words. Following ATA conventions those words are decoded little endian (note that SCSI commands use a big endian representation). In the future this utility may attempt to decode some log pages, perhaps using the --decode option.

The SAT-2 standard (SAT ANSI INCITS 465-2010, prior draft: sat2r09.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.

OPTIONS

-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.

-c, --count=CO

the number CO is placed in the "count" field in the ATA READ LOG EXT command. This specified the number of 512-byte blocks of data to be read from the specified log.

-d, --dma

use the ATA READ LOG DMA EXT command instead of ATA READ LOG EXT command. Some devices require this to return valid log data.

-h, --help

outputs the usage message summarizing command line options then exits. Ignores DEVICE if given.

-H, --hex

when given once, the response is output in ASCII hexadecimal bytes. When given twice, then the response is grouped into 16 bit words using ATA conventions (i.e. little endian); this is the default output (i.e. when this option is not given). When given thrice (i.e. '-HHH') the output is in hex, grouped in 16 bit words (without a leading offset and trailing ASCII on each line), in a format that is acceptable for 'hdparm --Istdin' to process.

-L, --log=LA

the number LA is known as the "log address" in the ATA standards and is placed in bits 7:0 of the "lba" field of the ATA READ LOG (DMA) EXT command. This specifies the log to be returned (See ATA-ACS for a detailed list of available log addresses). The default value placed in the "lba field is 0, returning the directory of available logs. The maximum value allowed for LOG is 0xff.

-p, --page=PN

the number PN is the page number (within the log address) and is placed in bits 32:16 of the "lba" field of the ATA READ LOG (DMA) EXT command. The default value placed in the "lba" field is 0. The maximum value allowed for LOG is 0xffff.

-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

COPYRIGHT

SEE ALSO