There are
two reasons...First, it was developed in Winchester,
England, and stored 30MB on each of two platter surfaces. Second, the
model number, 3030, made people think of the Winchester model 3030
rifle.
The model is 3340, not 3030. 3340s (and 3344s) are odd things - the
platters are lubricated with silicone based oil, and the removable disk
packs (3348s) _include_ the heads. When the disk pack is mounted (which
can be done by hand, for maintenance), a rather complicated series of
events connects the heads' wires, the air supply is sealed, and the whole
head assembly is aligned so it floats on a cushion of air.
I've seen references to "3030" in many books over the years...I'm
nowhere near old enough to have been there though.
-Dave McGuire