Patent ID: 7305589

Claim:
A memory card comprising: a nonvolatile semiconductor memory storing operation check data in a certain storage area; and a control part which includes: a storage unit storing operation checked data for comparison to the operation check data read from said nonvolatile semiconductor memory; and a processing unit performing an initial setting operation, and then performing a first check operation for comparing the operation check data read from said nonvolatile semiconductor memory with the operation checked data of said storage unit, wherein said processing unit receives an operation instruction signal from an external circuit and issues in response thereto an instruction to said nonvolatile semiconductor memory in accordance with said operation instruction signal when said operation check data and said operation checked data for comparison are found to match with each other in said first check operation, and wherein said processing unit performs said first check operation again when said operation check data and said operation checked data are found to be mismatched with each other.