hdparm (5) Linux Manual Page
hdparm.conf – Debian configuration file for hdparm
Description
This is the default configuration for hdparm for Debian. It is a rather simple script, so please follow the following guidelines :) Any line that begins with a comment is ignored – add as many as you like.
Note that an in-line comment is not supported. If a line consists of whitespace only (tabs, spaces, carriage return), it will be ignored, so you can space control fields as you like. ANYTHING ELSE IS PARSED!!
This means that lines with stray characters or lines that use non # comment characters will be interpreted by the initscript. This has probably minor, but potentially serious, side effects for your hard drives, so please follow the guidelines. Patches to improve flexibilty welcome.
Please read /usr/share/doc/hdparm/README.Debian for notes about known issues, especially if you have an MD array.
Note that if the init script causes boot problems, you can pass ‘nohdparm’ on the kernel command line, and the script will not be run.
Setting an option outside of one of the stanzas enables it for all drives.
If an option is listed twice, the second instance replaces the first.
/sbin/hdparm is not run unless a block of the form:
DEV {
- option
- option
- }
exists. This blocks will cause /sbin/hdparm OPTIONS DEV to be run. Where OPTIONS is the concatenation of all options previously defined outside of a block and all options defined with in the block.
Options
-qbe quiet- quiet
-asector count for filesystem read-ahead- read_ahead_sect = 12
-Adisable/enable the IDE drive’s read-lookahead feature- lookahead = on
-bbus state- bus = on
-Bapm setting- apm = 255
-Bapm setting when on battery- apm_battery = 127
-cenable (E)IDE 32-bit I/O support – can be any of 0,1,3- io32_support = 1
-ddisable/enable the "using_dma" flag for this drive- dma = off
-Denable/disable the on-drive defect management- defect_mana = off
-Ecdrom speed- cd_speed = 16
-kdisable/enable the "keep_settings_over_reset" flag for this drive- keep_settings_over_reset = off
-Kdisable/enable the drive’s "keep_features_over_reset" flag- keep_features_over_reset = on
-msector count for multiple sector I/O- mult_sect_io = 32
-Pmaximum sector count for the drive’s internal prefetch mechanism- prefetch_sect = 12
-rread-only flag for device- read_only = off
-sEnable/disable the power-on in standby feature- poweron_standby = off
-Sstandby (spindown) timeout for the drive- spindown_time = 24
-uinterrupt-unmask flag for the drive- interrupt_unmask = on
-WDisable/enable the IDE drive’s write-caching feature- write_cache = off
-XIDE transfer mode for newer (E)IDE/ATA2 drives- transfer_mode = 34
-yforce to immediately enter the standby mode- standby
-Yforce to immediately enter the sleep mode- sleep
-ZDisable the power-saving function of certain Seagate drives- disable_seagate
-MSet the acoustic management properties of a drive- acoustic_management
-pSet the chipset PIO mode-
chipset_pio_mode –security-freezeFreeze the drive’s security status- security_freeze
–security-unlockUnlock the drive’s security- security_unlock = PWD
–security-set-passSet security password- security_pass = password
–security-disableDisable drive locking- security_disable
–user-masterSpecifies which password to select- security_mode = u
–security-modeSet the security mode- security_mode = h
- Root file systems.
- Please see README.Debian for details. ROOTFS = /dev/hda
Blocks beginning with the keyword ‘command_line’ instead of a device identifier are no longer supported for backwards compatibility by this version of hdparm. Options must be introduced by a correct device identifier instead so that they will be applied when the device becomes available.
Author
hdparm was written by Mark Lord <mlord [at] pobox.com> The init script and configuration file are currently maintained by Stephen Gran <sgran [at] debian.org>, but are the result of the work of many people.
This manual page was created by Stephen Gran <sgran [at] debian.org> for the Debian GNU/Linux system (but may be used by others).