MEMORY SYSTEM AND COMPUTER SYSTEM

摘要

PURPOSE: A memory system and a computer system are provided to reduce a defective rate which is allowable in a chip group while obtaining reliability of the memory system. CONSTITUTION: Memory chip groups(10a,10b) have a chip of n nonvolatile semiconductor memories respectively. A unit area of one of n chips memorizes an error correction code for a group including a unit area of (n-1) chips. The chip storing the error correction codes are different at all locations of unit areas. When data of the unit area is re-recorded, an access destination calculator designates a unit area storing the error correction code is designated as a record destination of re-recoded data.