From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tim Small <tim@buttersideup.com>
Subject: Re: Use of WD20EARS with MDADM
Date: Wed, 21 Apr 2010 19:40:19 +0100
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To: Mark Knecht <markknecht@gmail.com>
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Mark Knecht wrote:
> This machine only gets a few hours of use a day but is generally
> powered up all the time. I don't know why Linux wakes this drive up
> roughly every two minutes, assuming it's Linux and not the drive
> itself or something on the motherboard, but it does.
>   


This is documented here:

https://ata.wiki.kernel.org/index.php/Known_issues#Drives_which_perform_frequent_head_unloads_under_Linux

If you want to fix it, then wdidle3.exe worked for me.  Search for:

wdidle3_1_00.zip


Tim.