I just got an apple tv, connected to my tv. Sometimes I'm just watching cable or regular television, or not watching anything at all (tv turned off) I do not see on the remote control the possibility to turn off the ATV. I only see the "sleep" option on the menu. Is that enough? To keep a longer life of ATV should I instead be always unplugging it from the energy source? Note that I also have used AppleTV Flash, and have a 500 GB external LaCie USB hard disk ALWAYS connected to ATV. So I'm also concerned about this piece, as I experienced HD failure with other products (ioMega to be more specific).