Patent ID: 7768881
Filing Date: 2010-08-03
Classification: G11B

Abstract:
1. An optical-information recording medium comprising: a substrate that includes a servo surface having a servo pattern thereon; an information recording layer laminated on the servo surface of the substrate capable of recording information as a hologram produced by interference between an information beam containing the information and a reference beam; an address servo area that is formed as a part of the servo pattern in a track direction on the servo surface, and that records therein address information and clock information for aligning a beam, emitted from an optical-information recording apparatus for recording information in the information recording layer, to a target position in the information recording layer; and a following up servo area that is formed as a part of the servo pattern in the track direction on the servo surface, and that is to be irradiated by the beam to make the beam follow a rotation of the optical-information recording medium, wherein the address servo area and the following up servo area are arranged in parallel extending in circumferential direction on the optical-information recording medium.