I have noticed this as well but mine does eventually goto sleep. It's disturbing as, just like you mentioned, it's not processing any media files (per the my.pogoplug.com media settings page). Nothing Is pending au processing.
People who have access to the drive aren't doing anything.
So, what the heck is causing the drive to act as if data is being accessed?

It's the one thing about PogoPlug that is a bit disturbing, it's not at all clear what the pro device is doing at times. I once disconnected and powered everything off as it just couldn't be healthy having the drives spin for as long as they were spinning.

This has been an issue that I have mentioned before but never really got an answer.

Maybe I need to upgrade my PogoPlug Pro device? I'm not even sure if my device got updated recently...I think it did...my mobile apps did thats for sure.

KwadGuy said: No one else is seeing this? It's very annoying, and I expect will lead to premature drive failure. The drive is on/accessed 24/7 at this point, whereas before the updates, it was sleeping the vast majority of the time...

For grins, you might want to try doing what i did once when the drive seemed to never sleep. I properly shutdown the whole mess (PPPRO, my hard drives). Let it sit and chill for a bit, literally as my drives actually felt warm as they had been running for so long. 

I reattached everything and waited as PPPro did the 3hr 'processing media' bit then they finally stopped running. The only issue now is that they seem to just run for long periods of time when I know no one is accessing them and there's no message indicsting that any media is being processed.  

So while they might not be running as long as before they do still run for long periods and I'm not sure really as to why. The lengthy media processing part can test the patience of a saint. 

Dont get me wrong, I still like my PPPro I just wonder at times what it's doing...

I just hooked up a new pogoplug tonight and have two hard drives which keep churning...it's been a few hours now. Hard drives don't keep reading without a reason. This isn't normal.
A response from the manufacturer would be helpful -- and appreciated.

I don't think Pogoplug has build in spindown capacity. This is not something one can blame CE, because everyone has different hard drives and enclosures. There is no universal spindown program that would work for all drives/enclosures. I have four different hard drives myself. One has build in sleep feature. Other two can each be spindown with different programs from Optware. For the fourth one, I haven't found any method could work. So you probably can not rely on CE to solve this issue for you. There are several options available in Optware. You need to test them to find out which one would work for your drive.