I'm new to the MacBook, obviously as everyone is. I dropped it on my couch from about a foot above when I tripped over my stupid cat. Anyway when it fell I could hear my MacBook make this high pitch noise when it was falling so I took it and kind of dropped it in my hands and it made the noise again. Is that my MacBook detecting when it's falling? I remember hearing somewhere that it detects when it is falling and stops the pin on the HD so no data is damaged. Could that be what I'm hearing?