US Patent 7890732 Memory card and semiconductor device

A memory card includes a controller and a nonvolatile semiconductor memory. The controller manages a correspondence between a first address in a semiconductor memory of a first erase block size and a second address in a semiconductor memory of a second erase block size other than the first erase block size. The nonvolatile semiconductor memory is a memory of the second erase block size. The controller executes access to the nonvolatile semiconductor memory by the second address.