RECORD CARRIER AND METHODS FOR WRITING A RECORD CARRIER

摘要

The present invention relates to a record carrier (10) for creating a multi-level ROM optical medium, wherein the record carrier 10 comprises a first recording layer (12) and at least a second recording layer (14). In accordance with the invention between said first recording layer (12) and said second recording layer (14) there is provided a physical barrier (16) leading to discrete pit depths. Furthermore, the invention relates to two methods for writing a record carrier to create a multi-level ROM optical medium.