Abstract: A portable storage device with operating status display is applied for a processor-based system. The portable storage device includes a storage medium, a control unit, an operating-status-analysis driving unit and a display unit. The control unit receives an access signal from the processor-based system, in order to record and read the information saved in the storage medium to generate a record-and-read signal. The operating-status-analysis driving unit electrically connects with the control unit to give a driving signal after analyzing the record-and-read signal. The display unit receives the driving signal for demonstrating information about an operating status. Therefore, the operating status of the portable storage device is informed in real time.