Patent attributes
A storage device includes: a binary flash memory that has a first storage area and a capacity of storing two values per cell; a multivalued flash memory that has a second storage area and a capacity of storing at least three values per cell; and a controller configured to arrange the first storage area ahead of the second storage area, logically combine the first storage area with the second storage area to form a single combined storage area, and perform data reading and data writing from and into the combined storage area. Data management information is stored in a head of the combined storage area according to a predetermined file system. The storage device of this arrangement has the advantages of both an SLC flash memory and an MLC flash memory.
