Abstract: A data processing device applying for a storage device includes: a first interface circuit coupled to the storage device; a processing circuit coupled to the first interface circuit for reading a control code from a divided storage area in the storage device, and executing the control code to generate a storage capacity of the storage device; and a second interface circuit coupled to the processing circuit for feeding the storage capacity back to an operating system such that the operating system regards the storage capacity as a usable capacity of the storage device.

Abstract: A controlling circuit applicable in a physical storage device includes: a dividing circuit coupled to the physical storage device for dividing a storage capacity of the physical storage device into a plurality of divided storage areas, wherein a divided storage capacity of each divided storage area is not larger than the capacity corresponding to the largest address generated by an operating system; and a feedback circuit coupled to the dividing circuit for feeding back the plurality of divided storage areas to the operating system such that the operating system regards the plurality of divided storage areas as a plurality of independent physical storage devices.

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.