In the data protection system for controlling a data entry point, a storage unit for storing data includes a data entry point area and a data area for storing the physical data, in which the data entry points inside the data entry point area are pointed to specific sectors inside the data area, respectively. Therefore, if an authorized user does not know where the data entry point is, he or she cannot obtain the data from the data area. The system is to provide a corresponding data entry point only when a RFID TAG, similar to a key, is to disable locking, so that a corresponding computing apparatus can then read or write data to and from the storage unit inside the system. On the contrary, data cannot be read or written after the locking is enabled, so that data protection is achieved.