By partitioning data into segments and by defining {HEAD ~ checkpoints} based upon the segmentation, a process may be restarted at {TAIL ~ each defined checkpoint} 
By partitioning data into segments and by defining { HEAD ~ checkpoints } based upon the segmentation , a process may be restarted at { TAIL ~ each defined checkpoint }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL