Image forming apparatus having a plurality of ports to which USB device is attachable

An image forming apparatus comprising:

• a housing having a front section and a rear section;
• a print engine;
• a user interface including a display, the user interface being disposed at the front section of the housing and not at the rear section;
• a controller;
• and
• two USB ports configured to receive a USB memory removably attached thereto, the two USB ports including a first port disposed at the front section within which the display is completely included, and a second port disposed at the rear section, the front section and the rear section being respective sections of the housing defined by imaginarily dividing the housing in half, where the front section and the rear section are located opposite to each other in a front-rear direction,
• wherein the controller is configured to:
• when a first USB device for a particular function is attached to the second port, perform processing using the particular function with the first USB device attached to the second port;
• and
• when a second USB device that is not for the particular function is attached to the second port, cause the user interface to display a notification screen corresponding to that the second USB device is attached to the second port.