Patent ID: 8161333

Claim:
An information processing system comprising: a dynamic random access memory; a processor for information processing in cooperation with the dynamic access memory; and a built-in diagnosis module including a longevity evaluation device; the longevity evaluation device including: a timer for measuring an elapsed time after data is entered into a memory device; a read controller for reading the data from the memory device when the elapsed time reaches a predetermined time; an evaluator for evaluating a longevity of the memory device based on an existence of an error in the data read by the read controller and the elapsed time, the evaluator for calculating an initial retention time of the memory device when the read controller is able to read the data from the memory device without existence of the error; and a storage section for storing the initial retention time calculated of the memory device; wherein the read controller reads the data from the memory device when the elapsed time reaches the predetermined time, the predetermined time obtained by subtracting a threshold from the initial retention time, and the evaluator evaluates the longevity of the memory device when the error of the data exists.