Tiered mass storage assemblies are presented. The mass storage assembly in one example includes a plurality of drive interfaces configured to couple to a plurality of storage devices, with each drive interface of the plurality of drive interfaces being configured to exchange digital data at a predetermined maximum interface throughput, one or more low-output storage drives coupled to one or more corresponding drive interfaces, with a low-output storage drive exchanging digital data using the predetermined maximum interface throughput, and one or more high-output storage drives, with each high-output storage drive of the one or more high-output storage drives being coupled to two or more drive interfaces and with a high-output storage drive exchanging digital data using two or more predetermined maximum interface throughputs of the two or more drive interfaces.