Medium sized storage

A middle sized storage between the small and large storages.
for example:
small storage footprint=1x1
large storage footprint=2x2
then the medium storages would be 1x2.
the smaller medium would have a volume of 720 and the big medium would have 1440, as it fits in between the numbers of the existing storages.
and inputs and outputs around all the storages, and it would work as the balancers with the ports, so you could have input and output on the same side.