Comment Re:4 inches? (Score 5, Interesting) 102
It sounds to me from the paper like a laptop's own speakers are capable of generating enough sound to disrupt the laptop's hard drive, in ultrasound ranges that most humans can't hear. Yes, it's a lot of sound energy, but still possible for it to be unnoticed, especially if you timed it for when the user isn't around, or mixed it into music or other legitimate sound.