A control unit controls the use of a flash memory in which a recording area is divided into a plurality of blocks. The control unit includes a SRAM for storing management information regarding history that blocks have been used for recording information, the management information being updated every...http://www.google.se/patents/US5500742?utm_source=gb-gplus-sharePatent US5500742 - Control unit of flash memory and facsimile machine using such control unit
