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List or change SCSI disk parameters

SCSI disk parameters are held in mode pages. This utility lists or changes those parameters. Other SCSI devices (or devices that use the SCSI command set) such as CD/DVD and tape drives may also find parts of sdparm useful. Requires the linux kernel 2.4 series or later. In the 2.6 series any device node the understands a SCSI command set may be used (e.g. /dev/sda). In the 2.4 series SCSI device node may be used.

Fetches Vital Product Data pages. Can send commands to start or stop the media and load or unload removable media.

Warning: It is possible (but unlikely) to change SCSI disk settings such that the disk stops operating or is slowed down. Use with care.

Package version:1.05


sdparm is a utility for listing and potentially changing SCSI disk
parameters. More generally it can be used on any device that uses
a SCSI command set. Apart form SCSI disks, examples of devices that
use SCSI command sets are ATAPI CD/DVD drives, SCSI and ATAPI tape
drives and SCSI enclosures.

This utility was originally written for Linux. It has been ported
to FreeBSD,


SDPARM(8)                      SDPARM                      SDPARM(8)

       sdparm - access SCSI modes pages; read VPD pages; send simple
       SCSI commands.

       sdparm   [--all]   [--clear=STR]   [--command=CMD]    [--dbd]
       [--defaults]   [--dummy]  [--flexible]  [--get=STR]  [--help]
       [--hex] [--inquiry] [--long]  [--num-desc]  [--page=PG[,SPG]]


The version number is hardcoded into sdparm.c (in a C string);
the rpm spec file: sdparm.spec ; the debian/changelog file;
and the file (in the AC_INIT item).

ChangeLog for sdparm-1.05 [20100413] [svn: r149]
  - add '--readonly' option especially for '-C start' and
    '-C stop' on ATA disks.
  - Control mode page updates (spc4r23)
  - add Control data protection mode page (ssc4r01)



Douglas Gilbert <dgilbert at interlog dot com>


Copyright (c) 2005-2009 Douglas Gilbert.
 All rights reserved.

Redistribution and use in source and

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