A non-volatile solid-state storage subsystem, such as a non-volatile memory device, maintains usage statistics reflective of the wear state, and thus the remaining useful life, of the subsystem's memory array. A host system reads the usage statistics information, or data derived therefrom, from the subsystem...http://www.google.com/patents/US7653778?utm_source=gb-gplus-sharePatent US7653778 - Systems and methods for measuring the useful life of solid-state storage devices
