MEMORY DEVICE, CONTROL METHOD AND CONTROLLER

摘要

A memory device records data on a recording medium and reproduces it using a head including a recording element and a reproduction element. A medium scanning part counts the number of writes on the recording medium per head, reads the data from the medium for the head whose number of writes reaches a predetermined threshold or larger during idling without access request from an upper device and, when an error in reading occurs, executes read-and-verify processing for re-writing recovered data for a recoverable error. A threshold management part initially registers a threshold for the number of writes per head according to performance of the head and dynamically changes the threshold of the number of writes depending on an error rate during operation of an apparatus.