Method and mass storage memory system is provided. The system includes, re-programmable non-volatile memory cells, the memory cells being arranged in a plurality of blocks that are erasable together; and a controller including a microprocessor that is adapted to receive files of data identified by unique identifiers via a first interface and the controller causes a received data file to be stored in one or more memory blocks; and the controller receives data identified by logical addresses via a second interface and stores the received data in one or more memory blocks, wherein data written via the first interface is indexed using the unique identifiers so that data is accessible via the second interface or the first interface; and data received via the second interface is indexed so that data can be accessed via the first interface or the second interface.