On Wed, 20 Mar 2013 11:21:32 +0200
"Andris Berzins" [off-list ref] wrote:

quoted

quoted

Is this because of WD "green" series?

No.

"Green" series are special because they spin down after 7 seconds and they do not
return in timely manner when read error occurs.

They do not spin down after 7 seconds, they unload their heads. In any case
this behavior is not expected to ever cause Current_Pending_Sectors rising
(which are plain and simple unreadable sectors no matter how hard you try or
how long you wait).

You can disable the 7-second unload time behavior by using either "hdparm -J"
or using "idle3-tools" http://idle3-tools.sourceforge.net/ (also available in
Debian). I would indeed recommend doing that to reduce wear and tear on the
head mechanism from constant loads/unloads; but I somewhat doubt this will
make a difference in relation to your issue.

-- 
With respect,
Roman