Semiconductor storage apparatus including a controller for sending first and second write commands to different nonvolatile memories in a parallel or time overlapped manner

A storage apparatus to be coupled with a system bus for receiving a write request accompanied with one sector data and an other sector data through said system bus from an external information processing system, wherein each of said one sector data and said other sector data is comprised of 512 bytes, comprising:

• a plurality of nonvolatile semiconductor memories which stores said one sector data and said other sector data, and
• a control means to be coupled with said system bus, and coupled with said plurality of nonvolatile semiconductor memories which carries out write operations of said one sector data and said other sector data into said plurality of nonvolatile semiconductor memories in response to said write request,
• wherein said control means, responsive to said write request, sends a first write command to write said one sector data comprised of 512 bytes to one of said plurality of nonvolatile semiconductor memories and, after the first write command has been sent, said control means sends a second write command to write said other sector data comprised of 512 bytes to another of said plurality of nonvolatile semiconductor memories different from said one of said plurality of nonvolatile semiconductor memories to which said first write command has been sent so that an operation of data writing of said one sector data, responsive to said first write command, within said one of said plurality of nonvolatile semiconductor memories and an operation of data writing of said other sector data, responsive to said second write command, within said another of said plurality of nonvolatile semiconductor memories are carried out in parallel.