OPTICAL STORAGE MEDIUM

摘要

An optical storage medium comprising a storage layer (4) and a first layer (5) covering the storage layer (4). The first layer (5) provides optical properties sufficient for data retrieval from the storage layer using a laser (8) with a first wavelength WI, A second layer covers the first layer (5) and provides optical properties sufficient for data retrieval from the storage layer using a laser with a second wavelength W2.