A method for processing findings entered in a mammogram. In the case where a non-linear correction processing is performed in a direction in which the amplitude level of the luminance signal is lowered, an amplitude level correction processing is performed to the color signal on the basis of a second coefficient read from a second table prepared in advance in correspondence to the case. Multiple interleaved sets of servo sector patterns are written to each of the remaining recording surfaces, each interleaved pattern respectively comprising a plurality of angularly spaced apart servo sectors. The conical expander member detaches the introducer from the deployment catheter through the longitudinal slit of the sheath, while the cylindrical sleeve reattaches the introducer to the deployment catheter through the longitudinal slit. When the flexible casing is not compressed and is situated at a second position, the connecting portion is hidden in the flexible casing, and the portable storage device is at a status of being housed.