       0. In a non-volatile memory system having a plu-      rality of blocks of memory storage elements that      are individually erasable as a unit and which are      individually organized into a plurality of pages of      memory storage elements that are individually      programmable together, a method of substituting      new data for superceded data within at least one      page of one of the plurality of blocks while data in  SANDISK CORP   v. KINGSTON TECH                           00       at least another page of said one block is not re-     placed, comprising:          programming the new data into at least one              page of said one or another of the plural-              ity of blocks,          identifying the at least one page of superceded              data and the at least one page of new 