To provide enhanced operation of data storage devices and systems, various systems, apparatuses, methods, and software are provided herein. In a first example, a data storage system is presented. The data storage system includes data storage devices each configured for storage of data at associated storage media densities. The data storage system includes a control processor configured to vary storage media densities of ones of the plurality of data storage devices based at least on positioning of the plurality of data storage devices within an associated enclosure.