The memorandum report and memory storage,

摘要

PROBLEM TO BE SOLVED: To provide a storage device specifying a RAM defect affecting range by collecting trace information for a plurality of stages with a stage tracer after and before a moment when an uncorrectable error has occurred, permitting the storage device itself to request and generate collected trace information and accessing RAM except a fault port. SOLUTION: The device is provided with a pseudo request generating part 12 issuing a pseudo request to a storage part 118 through a request selecting part 112 even when a host device is not connected, a tracer part 115 having a function for tracing trace information by a plurality of the stages with a trigger signal 1153 before and after a stage where a read data control part 119 detects an uncorrectable state when data is read from the storage part 118 and a trigger condition part 113 generating the trigger signal 1153 from the trigger condition of the uncorrectable error or the like.