I didn't know that, I put mine to sleep unless I'm up and too lazy toseperate myself from my distraction to put it to sleep. I noticed my fan sounds weird until it gets going a few minutes afetr waking in the morning. My fan is too loud to leave on at night, not loud, but you know it's there. Whats with that spin down hard drive option? I don't like the way that sounds when I try to access something after it spins down.