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Member "hdparm-9.65/README.acoustic" (12 Oct 2016, 1603 Bytes) of package /linux/misc/hdparm-9.65.tar.gz:


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    1 Automatic Acoustic Management
    2 =============================
    3 
    4 Most modern harddisk drives have the ability to speed down the head movements
    5 to reduce their noise output. The possible values are between 0 and 254. 128
    6 is the most quiet (and therefore slowest) setting and 254 the fastest (and loudest).
    7 Some drives have only two levels (quiet / fast), while others may have different
    8 levels realized between 128 and 254.
    9 
   10 To be able to use this with hdparm, you will need a current kernel with the -ac patches
   11 applied. Maybe the kernel of your favorite distribution will already include this (SuSE
   12 has it in their current kernel, for example).
   13 Just try to compile hdparm, type "hdparm" and have a look for "-M" in the output. If it 
   14 doesn't appear, your kernel most likely doesn't support it. 
   15 
   16 You can get the acoustic setting by typing
   17 
   18 	hdparm -M /dev/hda 
   19 
   20 To set the most quiet mode use
   21 
   22 	hdparm -M 128 /dev/hda
   23 
   24 For the fastest setting use
   25 
   26 	hdparm -M 254 /dev/hda
   27 
   28 Now test different values and try to hear the difference. :-) 
   29 
   30 Not all disk drives support this setting - and the speed impacts may also vary between
   31 different manufacturers and models.  
   32 
   33 If you see lines like
   34 
   35 	kernel: hdb: task_no_data_intr: status=0x51 { DriveReady SeekComplete Error }
   36 	kernel: hdb: task_no_data_intr: error=0x04 { DriveStatusError }
   37 
   38 in your syslog, then your harddisk will most likely not support Acoustic Management.
   39 
   40 Perhaps you also wanna have a look on the IBM Feature Tool, available at 
   41 http://www.storage.ibm.com/hdd/support/download.htm.
   42 
   43 I would welcome any feedback to <gernot@hillier.de>
   44 
   45 Gernot
   46