home *** CD-ROM | disk | FTP | other *** search
- 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
-
-