An image forming apparatus includes a controller and a memory interface having a port to receive a portable memory. The controller performs a portable memory using process that includes storing data in a dedicated memory, and performing a process using the data stored in the dedicated memory in response to an operation received via a user interface. The controller stores, before the portable memory using process, identification information in a portable memory attached to the port, thereby setting the portable memory as the dedicated memory. The controller determines whether a target portable memory as attached to the port is set as the dedicated memory, based on whether the identification information is stored in the target portable memory. The controller determines whether to display a first screen or a second screen, based on whether the target portable memory is set as the dedicated memory.