I'm using version version 1.1.82 with WD My Book Live and seeing the same behavior. I have folder rescan set to 86400, and i see the settings.dat being accessed every 30 min. I have set the computers that sync with the My Book Live so ssh on login/logout and start/stop the btsync service. That way the My Book Live sleeps ok. But now I want to use My Book Live to sync with an Android Phone so that won't work anymore.