Multilayer optical recording medium and recording method on multilayer optical recording medium

摘要: In a multilayer optical recording medium having three or more layers, when data is recorded on layer far away from an incident surface of laser light, and especially farthest the by applying power margin allows for variation in optimal sensitivity even if transmittance layers located between light side target varied due to existing recordings amount passing therethrough also varied. this case, which has phase change film, nearest write-once read-multiple film.