Patent ID: 8495669

Claim:
A flexible disk in which optical information is recordable, the flexible disk comprising: an optical information recording portion where the optical information is stored; a holding part that is held on a turntable of a disk rotating device, the holding part having a front surface and a back surface, and wherein the holding part comprises a hub; and a first elastic body disposed on the front surface of the holding part, and a second elastic body disposed on the back surface of the holding part, such that the holding part is located between the first elastic body and the second elastic body, and wherein the first elastic body and the second elastic body are configured to elastically expand in a radial direction of the flexible disk, from an original state, when the optical information recording portion is rotated at high speed during recording and/or reading of the optical information, and wherein the first elastic body and the second elastic body are configured to reversibly return to the original state when rotation of the optical information recording portion is stopped.