{HEAD ~ The intermediary device} includes a power saving control function for the disk device and carries out {TAIL ~ operation control} such as spin off and spin up of disk devices in accordance with conditions set in advance 
carries out
{ HEAD ~ The intermediary device } includes a power saving control function for the disk device and carries out { TAIL ~ operation control } such as spin off and spin up of disk devices in accordance with conditions set in advance
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH