Information recording medium

An information recording medium comprising a transparent substrate, and a recording layer or a metallic layer formed on said transparent substrate directly or through an undercoat layer, with a vibration frequency attenuation time of 3 seconds or less when vibrated in the direction perpendicular to the flat surface of said information recording medium.

An information recording medium comprising a transparent substrate, and a recording layer or a metallic layer formed on said transparent substrate directly or through an undercoat layer, with an amplitude attenuation time of 1 second or less and a vibration frequency attenuation time of 3 seconds or less, when vibrated in the direction perpendicular to the flat surface of said information recording medium.

An information recording medium comprising a transparent substrate, and a recording layer or a metallic layer formed on said transparent substrate directly or through an undercoat layer, including information recording, reproducing and/or deleting tracks along which tracks information can be recorded, reproduced and/or deleted by an information recording, reproducing and/or deleting device, wherein when said information recording medium is in-plane vibrated in the direction perpendicular to the extending direction of said tracks, a maximum in-plane deviation of a recording, reproducing or deleting position in said tracks in said perpendicular direction from a correct recording, reproducing or deleting position in said tracks is 12.5×d or less wherein d is an average distance between the adjoining tracks measured in the direction perpendicular to the extending direction of said tracks, and an acceleration of said information recording medium in said perpendicular direction is 0.25 m/s2 or less.

An information recording medium comprising a transparent substrate, and a recording layer or a metallic layer formed on said transparent substrate directly or through an undercoat layer, including information recording, reproducing and/or deleting tracks along which tracks information can be recorded, reproduced and/or deleted by an information recording, reproducing and/or deleting devices wherein an in-plane deviation of a recording, reproducing or deleting position in said tracks from a correct recording, reproducing or deleting position in said tracks is monitored by a tracing device for tracing said recording, reproducing or deleting position, a correct recording, reproducing or deleting position is virtually determined by said monitored in-plane deviation, and a maximum in-plane deviation is controlled to be 12.5×d or less wherein d is an average distance between the adjoining tracks measured in the direction perpendicular to the extending direction of said tracks, and an acceleration of said information recording medium in said perpendicular direction is also controlled to be 0.25 m/s2 or less.