For preventing degradation of the performance, it is necessary to select and execute a power saving mode having a short return time to “operating”, use a magnetic disk unit having a short time until spin up, or consider {HEAD ~ access} to {TAIL ~ a memory} for holding data instead of a magnetic disk unit 
For preventing degradation of the performance , it is necessary to select and execute a power saving mode having a short return time to “ operating ” , use a magnetic disk unit having a short time until spin up , or consider { HEAD ~ access } to { TAIL ~ a memory } for holding data instead of a magnetic disk unit
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