Well that's novel. Or maybe not.
See e.g. Conner Peripherals product codenamed "Chinook" (it's on Wikipedia).
And long before Chinook there were things that can probably be found in places like Jim Austin's Computer Collection; standard (for the era) size disk drives that would fill a 19" rack or more, with multiple independently operatable disk heads. My memory is failing, I cannot quickly find any particular examples of such a product, but they did exist.
Biting the hand that feeds IT
