Western_Digital_GreenPower_Disks.txt
( http://wiki.birth-online.de/know-how/hardware/western-digital-greenpower )


IntelliPark

WD GreenPower disks have some problems under Linux with their “head parking” feature parking 
the head every 8 seconds. This destroys the disk over a short time span.

More info:

    http://www.sagaforce.com/~sound/wdantiparkd/
    http://www.instantfundas.com/2011/12/intellipark-makes-western-digital-green.html

Temporary fix

To fix this, you have to disable it or set it to a more reasonable timeout:

   $ sudo hdparm -S 242 /dev/sdX

You have to repeat this after each boot, so you may want to add the line to your /etc/rc.local.
Permanent fix

To fix this permanently, you can compile the tool wdidle3. There's a bootable ISO available for 
download at ngohq.com. For Linux, there's idle3ctl from the idle3-tools.

You can display the current value with the following command:

   $ sudo ./idle3ctl -g /dev/sdX
   Idle3 timer set to 80 (0x50)

The value 80 means 8 seconds (default). From 1-128, the values mean 1/10th of a second, e.g. 128 would 
be 12.8 seconds. 129-254 are in 30 seconds steps. 129 is 30 seconds, 130 is 60 seconds, etc.

Set the desired value as follows:

   $ sudo ./idle3ctl -s 158 /dev/sdX
   Idle3 timer set to 158 (0x9e)
Please power cycle your drive off and on for the new setting to be taken into account. 
A reboot will not be enough!

Do as it says to enable the new setting.