The invention can be applied to {HEAD ~ the data storage device}, which can store {TAIL ~ a plurality} of items of history information relating to input/output processing of classified data without overlap 
store
The invention can be applied to { HEAD ~ the data storage device } , which can store { TAIL ~ a plurality } of items of history information relating to input / output processing of classified data without overlap
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH