I recently purchased a new HDD (Seagate Barracuda 7200.10--750GB) and slapped it in my computer. I can hear it making noise, which I'm pretty sure is it turning off and on. It does this a few times a minute or so. This is when the drive is not being used. I turned off indexing on the drive (it is being used for data only), but the sound persists. Am I being paranoid? What's going on and is it ok?