{TAIL ~ The data transaction system} uses a first stage for transferring the data unit from the upper layer to the storage layer, and a second stage to save {HEAD ~ the transferred data unit} independent of the upper layer 
{ TAIL ~ The data transaction system } uses a first stage for transferring the data unit from the upper layer to the storage layer , and a second stage to save { HEAD ~ the transferred data unit } independent of the upper layer
TAIL 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 OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH