A data writing method for a rewritable non-volatile memory module having a plurality of physical erasing units, and a memory control circuit unit and the memory storage apparatus are provided. This analysis is particularly applicable to comparing die on wafers to determine whether manufactured devices conform to a master or whether one die is like another. In accordance with one embodiment, the coating comprises a polyacrylic material. The service-specific tool is able to locate and communicate with the service by using information passed to the service-specific tool from the administrative tool. Furthermore, the personal digital assistant may also be rendered totally or partially useless once the personality card is removed from it.