linking {HEAD ~ the original value} of {TAIL ~ the data unit} to the update data before transferring the update data to the storage layer if transferring the update data to the storage layer results in updating a value of the data unit 
linking { HEAD ~ the original value } of { TAIL ~ the data unit } to the update data before transferring the update data to the storage layer if transferring the update data to the storage layer results in updating a value of the data unit
OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH