a data inspection method includes the steps of writing original test data in a memory region , reading the test data from the memory region , and comparing the read test data with the original test data , so as to make a data inspection . the test data is formed by a plurality of cell data . each of the cell data includes a delimiter indicating a boundary between two adjacent cell data , a cell number indicating an order within the test data , a cell data length indicating a data length of the cell data , and pattern data . each of the cell data in the test data has a cell data length which is variable .