Recordable storage medium with protected data area

摘要

A cryptographic summary of the system data stored in recordable data area (4), is generated using a hash function and stored in the fixed data area (2). The generated cryptographic summary is used for verification of the system data before reading/recording user data. Independent claims are also included for the following: (a) Recording medium with recordable data area and read only fixed data area; (b) Recording apparatus for storing data on a rewritable data storage medium; (c) Playback apparatus for playback of user data stored on a rewritable data storage medium.