Patent ID: 8059508
Filing Date: 2011-11-15
Classification: G11B

Abstract:
1. A holographic information storage medium comprising: a plurality of information layers in which information is recorded as holograms created by an interference between a reference light and a signal light; wherein a defect entry is recorded in the holographic information storage medium, the defect entry comprising: the holographic information storage medium is a dual side incident type holographic information storage medium in which the reference light is incident on a first side of the holographic information storage medium, and the signal light is incident on a second side of the holographic information storage medium; and either (1) there is only one reference information layer, which is one of the information layers that is closest to either the first side of the holographic information storage medium or the second side of the holographic information storage medium, or (2) there are two reference information layers comprising a first reference information layer, which is one of the information layers that is closest to the first side of the holographic information storage medium, and a second reference information layer, which is another one of the information layers that is closest to the second side of the holographic information storage medium.