Patent ID: 9026734
Filing Date: 2015-05-05
Classification: G06F

Abstract:
1. A memory system comprising: a nonvolatile memory including a memory area; a transfer processing unit that stores write data received from a host apparatus in the memory area; a delete notification buffer that accumulates a delete notification that is received from the host apparatus and designates unnecessary write data; and a delete notification processing unit that collectively reads out a plurality of delete notifications accumulated in the delete notification buffer, classifies the read-out delete notifications for each unit area smaller than the memory area, and sequentially executes, for each unit area, processing for collectively invalidating write data related to one or more delete notifications classified in a same unit area and, in executing processing for one unit area in the processing sequentially executed for the each unit area, invalidates all write data stored in the one unit area after copying write data excluding write data to be invalidated stored in the one unit area to another unit area.