WD was not much help. They don't support drives in third party enclosures, ask the enclosure maker. In other words, ask here. I did some poking around the WD site and it appears older drives with head unloading can be tuned to do that less often. Given that they offer the ability to tweak it, or at least used to, I am thinking it is probably not good for the drive to let this go on, so I will pull it out and try to tweak it to head onload less often, or eve not at all. Progress will be reported to this thread. Meanwhile, other users may want to stay away from green drives that do this, just in case it is hard on the drive.