Semiconductor storage apparatus in which different erase commands are sequentially sent to a plurality of nonvolatile semiconductor memories

A semiconductor storage apparatus to be coupled with a system bus to receive a write request accompanied with first and second blocks of data, comprising;

• a plurality of nonvolatile semiconductor memories which store said first and second blocks of data therein;
• and
• a control means to be coupled with said system bus, and coupled with said plurality of nonvolatile semiconductor memories,
• wherein said control means sends a first erase command to one of said plurality of nonvolatile semiconductor memories to initiate a first internal erase operation of data within said one of said plurality of nonvolatile semiconductor memories, and
• wherein, after said first erase command has been sent, said control means sends a second erase command to another of said plurality of nonvolatile semiconductor memories, different from said one of said plurality of nonvolatile semiconductor memories to which said first erase command was sent and which is under said first internal erase operation, to initiate a second internal erase operation of data within said other of said plurality of nonvolatile semiconductor memories.