NOT as cheap as tape
As 'cheap as tape' - my ****!
In the Register's other article on this device
http://www.theregister.co.uk/2015/04/08/hgsts_active_archive_system_arrives_speed/
The starting price is $849,000
That amount of money buys a staggering amount of tape so presumably they make it back on operating costs, oh hang on, no.... It's spinning disk so it needs constant power to make it spin and cool it down, unlike tape which needs next to no power unless reading or writing.