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 {HEAD ~ a magnetic disk unit} having {TAIL ~ a short time} until spin up, or consider access to a memory for holding data instead of a magnetic disk unit 
having
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 { HEAD ~ a magnetic disk unit } having { TAIL ~ a short time } until spin up , or consider access to a memory for holding data instead of a magnetic disk unit
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH