King snakes don't have rattles on their tail, but will shake their tails in the same manner. In a pile of dry leaves, it sounds pretty convincing.
Depends on the type of drive. Current 15k RPM SAS drives don't go much bigger than that... Also, (as TFA mentions) once you factor in some kind of overhead for redundancy, you're probably talking about 1TB drives. (Assuming this is 120 PB of *usable* capacity.)
Or there's this one from E3 in 1998: http://www.youtube.com/watch?v=omOPjBoClw0