Means of data storage, means of recording, process of operation of a system optico of recordings.Procedures for operation of a data storage unit, and a data processing apparatus, data processing apparatus, process of recording.The catalogue of means of recording process of indexing, controller, catalog of means of recording, the process of indexing, controller, process of operation of a player, recording, and actuator

摘要

An updatable and expandable directory structure and resultant access procedures emulating a write-once or indelible record medium (20) to a rewriteable record medium as to accessing characteristics. The directory is indexed; one directory header for a first set of files indexes another set of files. Sector clusters or data extents are managed such that random recording from any file proceeds independently of write-once characteristics. The directory is stored on the medium as data is recorde. Each directory entry contains an archival history of recording of a related data file in the medium. Both logical and physical addressing is employable.