Abstract: A nonvolatile storage device includes a casing, a circuit substrate, a latch and a driving piece. The outer surface of the casing is provided with a slot. The slot is connected with a push button switch. The circuit substrate is fixed in the casing. The circuit substrate is provided with a connecting interface made according to the standard of serial advanced technology attachment, a control unit and a nonvolatile memory unit. The connecting interface protrudes outside the casing. The control unit and the connecting interface are electrically connected with the nonvolatile memory unit. One end of the latch is fixed to the outside of the connecting interface with a portion thereof suspended. The driving piece is provided in the casing. One end of the driving piece is fixed to the push button switch, and the other end of the driving piece presses the suspended portion of the latch selectively.