The present disclosure pertains to multiple-platter disk drive digital data storage with integrated redundancy operations for improved reliability. Within a single disk drive assembly (300), one or more individual storage platters (304) can be used to store redundant data, enabling recovery of user data in the event that another platter (302) is defective, fails or is otherwise unavailable. “On-the-fly” redundancy operations (FIGS. 6A,6B) can be made transparent to the user or host, and impose no significant speed penalty. A data path switch (26) can reconfigure mappings between logical ports and platter interfaces (210) as needed.