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File Name : README.acoustic

Automatic Acoustic Management
=============================

Most modern harddisk drives have the ability to speed down the head movements
to reduce their noise output. The possible values are between 0 and 254. 128
is the most quiet (and therefore slowest) setting and 254 the fastest (and loudest).
Some drives have only two levels (quiet / fast), while others may have different
levels realized between 128 and 254.

To be able to use this with hdparm, you will need a current kernel with the -ac patches
applied. Maybe the kernel of your favorite distribution will already include this (SuSE
has it in their current kernel, for example).
Just try to compile hdparm, type "hdparm" and have a look for "-M" in the output. If it 
doesn't appear, your kernel most likely doesn't support it.

You can get the acoustic setting by typing

hdparm -M /dev/hda

To set the most quiet mode use

hdparm -M 128 /dev/hda

For the fastest setting use

hdparm -M 254 /dev/hda

Now test different values and try to hear the difference. :-)

Not all disk drives support this setting - and the speed impacts may also vary between
different manufacturers and models.

If you see lines like

kernel: hdb: task_no_data_intr: status=0x51 { DriveReady SeekComplete Error }
	kernel: hdb: task_no_data_intr: error=0x04 { DriveStatusError }

in your syslog, then your harddisk will most likely not support Acoustic Management.

Perhaps you also wanna have a look on the IBM Feature Tool, available at 
http://www.storage.ibm.com/hdd/support/download.htm.

I would welcome any feedback to <gernot@hillier.de>

Gernot

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2018-10-23 08:26:05
..	dir	-	root/root	drwxr-xr-x	2021-10-04 02:24:20
contrib	dir	-	root/root	drwxr-xr-x	2018-10-23 08:26:05
wiper	dir	-	root/root	drwxr-xr-x	2018-10-23 08:26:05
README.Debian.gz	application/x-gzip	2.39 KB	root/root	-rw-r--r--	2016-03-17 10:18:55
README.acoustic	text/plain	1.57 KB	root/root	-rw-r--r--	2007-04-28 05:18:22
TODO	text/plain	422 B	root/root	-rw-r--r--	2012-09-28 04:51:04
changelog.Debian.gz	application/x-gzip	2.91 KB	root/root	-rw-r--r--	2018-03-22 07:37:19
copyright	text/plain	3.21 KB	root/root	-rw-r--r--	2016-03-17 10:18:55

Name	Size	Last Modified	Owner / Group	Permissions	Options
..	--	October 04 2021 14:24:20	root / root	0755
contrib	--	October 23 2018 08:26:05	root / root	0755
wiper	--	October 23 2018 08:26:05	root / root	0755

README.Debian.gz	2.39 KB	March 17 2016 10:18:55	root / root	0644
README.acoustic	1.565 KB	April 28 2007 17:18:22	root / root	0644
TODO	0.412 KB	September 28 2012 16:51:04	root / root	0644
changelog.Debian.gz	2.906 KB	March 22 2018 19:37:19	root / root	0644
copyright	3.211 KB	March 17 2016 10:18:55	root / root	0644