An OA device for preloading content on memory cards is disclosed. A handler control module of a control unit performs a preloading process which comprises a preload check, preloading content based on digital content stored in buffers, and a preloaded content comparison, wherein memory cards at the initial column of a tray are checked, preloaded, and compared with the preloaded digital content using probes of a probe module. When the preloading content for the memory cards at the initial column of the tray is complete, the tray module or the probe module is moved by a stepper module by a predetermined distance, or the moving arm moves the probe module with a predetermined distance, to enable the memory cards at the next column of the tray to be checked, preloaded, and compared with the preloaded digital content using the probes while a sorting module picks up failed memory cards from the previous column based on records and instructions from the handler control module of the control unit.