A disk drive is disclosed that varies its data redundancy policy for caching data in non-volatile solid-state memory as the memory degrades. As the non-volatile memory degrades, the redundancy of data stored in the non-volatile memory can be increased to counteract the effects of such degradation. Redundant data can be used to recover data stored in the non-volatile memory in case of a data corruption. Performance improvements and reduced costs of disk drives can thereby be attained.