Patent ID: 7869070

Claim:
An image forming device for forming an image from image data transferred from a portable image data storage device via an external interface that can be connected to said image data storage device, comprising: a data size acquiring unit that acquires data size of said image data, for which said image is formed, from said image data storage device; and a calculating unit for calculating transfer completion time required for transferring said image data, for which said image is formed, based on said data size of the image data acquired by said data size acquiring unit and a speed of transferring data via said external interface, wherein said calculating unit calculates a plurality of transfer completion times corresponding to a plurality of external interfaces; and said image forming device further comprises a transfer completion time notifying unit for notifying said plurality of transfer completion times calculated by said calculating unit, and a selecting unit for allowing an user to select one of said plurality of external interfaces as an external interface to be used.