While receiving a disk drive reading command, {HEAD ~ the system} sequentially reads and processes the data in response to a data processing length parameter in {TAIL ~ the data} of the disk drive saved in the free memory space in accordance with the disk drive reading command and the data processing length parameter 
While receiving a disk drive reading command , { HEAD ~ the system } sequentially reads and processes the data in response to a data processing length parameter in { TAIL ~ the data } of the disk drive saved in the free memory space in accordance with the disk drive reading command and the data processing length parameter
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH