Same problem with DS210j and 2xSeagate ST31500541AS.
This is what I know about this problem (I was just googling and experimenting), please correct me if I'm wrong.
As I know this problem is because of combination Linux + green disk(s). HDD is parking reading head after few seconds of inactivity to save the energy but linux is accessing drive also if there is no activity on it and wake it up, so the head is moving from parking position to working position and this is the source of the clicking.
Is there any solution?
You need to disable or adjust the APM (advanced power management) of the drive. Western Digital released some utility for their drives to solve it, but Seagate is ignoring this problem and there is no utility or firmware to do it permanently for you drives. The only solution I found is to use special utility (hdparam or smarttools) to do it on runtime. The problem (at least for me) is that you must install this utility in the disk station.
For example read here:
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I didn't try it because I'm not very familiar with linux, I need to study the whole process of installing utilities to disk station and the using of telnet with it. If somebody have any experiences with using hdparam on diskstation or if there is any other workaround to solve this problem, please let us know.