| 摘要 |
A USB memory device incorporates a flash memory and a memory controller. An access lock is placed on a data storage area of the flash memory. When the USB memory device is attached to an electronic cassette, a cassette controller controls a USB controller to input an unlock password to the USB memory device. The memory controller unlocks the access lock on the data storage area when the unlock password matches a password stored in a program area of the flash memory in advance. |
