PORTABLE DATA STORAGE DEVICE INCORPORATING MULTIPLE FLASH MEMORY UNITS

摘要

A portable data storage device is disclosed which includes an Interface (3) for enabling the portable data storage device to be used for data transfer with a host Computer (5), and an Interface controller (7) for controlling the interface (3). There is also a master control unit (9) for controlling the writing of data to and reading data from a non-volatile memory. The non-volatile memory includes at least one single layer cell flash memory (11) and at least one multiple layer cell flash memory (13). Upon receiving a write instruction, the master control unit (9) determines which of the memories (11, 13) data contained in the instruction should be written to, and writes the data as appropriate similarly, upon receiving a read instruction, the master control unit (9) reads the data from the appropriate one of the memories (11, 13) and transmits the data out of the device.