Abstract: The present invention provides a method for providing a virtual optical disk function in a portable storage device and a portable storage device with a virtual optical disk function. The method for providing the virtual optical disk function in the portable storage device provided by the present invention can make a general standard portable storage device (such as flash drive, memory card, and external hard drive, etc.) to simulate functions of a conventional optical disk device, and have disk ejecting function and disk changing function. In addition, the portable storage device with the virtual optical disk function provided by the present invention can replace the conventional optical disk device to reduce the weight and volume of a computer system (such as notebook computer and desktop personal computer, etc.), and also can replace the virtual optical disk software of the computer system, to avoid occupying memory resource of the computer system.

Abstract: A data backup apparatus includes a host interface, a first storage medium interface, a second storage medium interface and a controller. The host interface is utilized to be electrically connected with a host, the first storage medium interface is utilized to be electrically connected with a first storage medium, and the second storage medium interface is utilized to be electrically connected with a second storage medium. The controller is coupled to the host interface, the first storage medium interface and the second storage medium interface, and is utilized for copying data from the first storage medium to the second storage medium without passing through the host interface.