1. A method comprises: determining a memory usability indication for a set of memory devices, wherein the set of memory devices stores data as first dispersed storage error coded data using first dispersed storage error coding parameters; comparing the memory usability indication to a memory usability level threshold; and when the memory usability indication compares unfavorably to the memory usability level threshold: adding one or more memory devices to the set of memory devices to produce an updated set of memory devices; and storing the data as second dispersed storage error coded data using second dispersed storage error coding parameters in the updated set of memory devices.