A recording medium is a disc-shaped recording medium having a plurality of recording layers, in which a video stream is recorded on the plurality of recording layers. Part of the video stream is recorded up to a first recording position on a first recording layer of the plurality of recording layers. A remaining part of the video stream is recorded from a second recording position of a second recording layer adjacent to the first recording layer. The video stream is seamlessly connected between the first recording position and the second recording position, and a first distance between the first recording position and the second recording position in the radial direction of the recording medium is smaller than a second distance in the radial direction regarding which a jump is permitted in seamless connection within a same recording layer.

When a simple magnification optical system is used in reproduction of a recording medium in which a large number of minute modified regions are three-dimensionally formed inside solid matter, contrast is insufficient and interlayer crosstalk is increased, and therefore, it is impossible to take a sufficient S/N ratio. Provided is a recording medium in which at least one layer is configured by a set of two adjacent sub-layers, and dots on a sub-layer correspond to a recording data 1 and dots on the other sub-layer correspond to 0. These data are played back.

Described are optical recording media for recording data in voxels, the optical recording media including a plurality of data recording regions for recording the voxels, the data recording regions separated by buffer regions having optical properties such that illumination from a reader that enters one of the data recording regions remains preferentially confined in said one of the data recording regions until being scattered by interaction with one or more of the voxels. Also described are methods for reading the described optical recording media, which include separating the light received from illuminating the voxels based on wavelength, polarization, or other optical properties.

An optical information storage medium includes a substrate and a multilayer polymeric film. The multilayer polymeric film has a first surface and an opposite second surface that extend the length of the multilayer polymeric film. The second surface is adhered to a surface of the substrate. The multilayer polymeric film includes a plurality of coextruded alternating polymeric active data storage layers and polymeric buffer layers.