Summary

Summarising this particular subject, storage costs, we have to note that:

$ Our main concern is the number of hours of information to be stored per cubic metre of housing.
$ We have to deal with the information housing costs per cubic metre.
$ We have to deal with the storage capacity of the carrier, i.e. the number of hours of information that can safely be stored on the carrier.
$ We do not consider the operational costs for staff and machines.