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