System for compensating for hard sector noise degradation of tra

System for creating, reading and writing on rotatable informatio

System for creating, reading and writing on rotatable informatio

System for creating, reading and writing on rotatable informatio

System for creating, reading and writing on rotatable informatio

System for creating, reading and writing on rotatable informatio

System for creating, reading and writing on rotatable informatio

System for creating, reading and writing on rotatable informatio

System for creating, reading and writing on rotatable informatio

System for creating, reading and writing on rotatable informatio

System for enhanced astigmatic focus signal detection

System for performing focusing operation when recording and/or r

System for recording data on spiral track

System for reproducing pulse time modulated wave forms stored al

System having optical disk and disk drive unit

System, method, and apparatus for characterizing, tracking,...

Systems and methods of shock recovery in writable optical...