Patent ID: 8232042

Claim:
A storage medium comprising: a recording layer formed of an organic dye material; a reflection layer formed of a silver alloy, light which is passed through the recording layer being reflected by the reflection layer; and a prevention layer provided between the reflection layer and the recording layer which prevents a characteristic change of the reflection layer, wherein, the recording layer includes an unrecorded area, information is recordable by light having a wavelength of 405 nm, an intensity of light reflected by the reflection layer and through a recording area of the recording layer is higher than an intensity of light reflected by the reflection layer and through the unrecorded area, and a light absorbance in the unrecorded area at a wavelength of 355 nm being not smaller than 40% of the light absorbance in the unrecorded area at a peak absorption wavelength in a range of wavelengths longer than 405 nm, the peak absorption wavelength being a wavelength for which the light absorbance in the unrecorded area in the range of wavelengths longer than 405 nm is highest.