Patent ID: 7444467

Claim:
A storage system coupled to a host computer, comprising: at least one controller receiving data from said host computer; at least one cache memory connected to said controller; a plurality of memory units connected to said controller, wherein said controller generates parity data, converts data of a count key data (CKD) format, in a case where said controller receives the data of the CKD format from said host computer, into data of a fixed block architecture (FBA) format and sends the converted data of the FBA format and said parity data to said cache memory which temporarily stores the converted data of the FBA format and said parity data, and wherein said memory units comprise: a semiconductor memory device which stores the converted data of the FBA format and said parity data permanently, wherein said controller stores the converted data of the FBA format and said parity data that is in said cache memory, in said semiconductor memory device.