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