Optical Disc Session Closure Before Data Erasure
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Solution Overview
Problem
Existing recordable optical discs, such as DVD-R and BD-R, do not allow for rewritable data, and existing erasure methods may fail to properly close sessions, leading to interruptions in data recording and reproduction operations.
Innovation Solution
An information recording apparatus and method that uses synchronization data and erasure information to manage and physically erase user data on recordable optical discs, ensuring that data is erased only after a session is closed, allowing for subsequent recording and reproduction operations to continue even if physical erasure is interrupted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical erasure of data is performed before closing the session, then data security is improved, but the reliability of subsequent recording operations deteriorates due to potential interruptions
Solution Approach 1:
The session is closed before physical data erasure is performed. This preliminary action ensures that the disc is in a stable state with all necessary session information written, so that even if the subsequent erasure operation is interrupted, the disc remains usable for future recording operations.
2Adaptability or versatility
If data erasure is performed on recordable optical discs, then data management flexibility is improved, but the manufacturing precision requirements worsen due to the need for precise session management
Solution Approach 1:
The data management process is segmented into distinct phases: session management phase (where recording and reproduction operations are controlled) and post-session erasure phase (where physical data erasure occurs). This segmentation allows each phase to be optimized independently, with session management ensuring disc integrity and post-session erasure providing data security.
3Reliability
If physical erasure operation is interrupted during data deletion, then device robustness worsens, but the ability to perform subsequent operations improves due to session closure
Solution Approach 1:
The session closure is performed as a preliminary action before the physical erasure process begins. This ensures that all critical session information is securely written to the disc before the erasure operation starts, making the system resilient to interruptions during erasure.
Data Source
AI summary
An information recording apparatus includes: a first memory which stores synchronization data for updating data on a recordable optical disc and/or adding data to the recordable optical disc; a second memory which stores erasure information indicating data to be erased; and a controller which controls addition, update, and erasure of data on the optical disc. The controller records the synchronization data onto the optical disc. After recording the synchronization data, the controller records, onto the optical disc, management information indicating the state of the optical disc on which the synchronization data has been recorded and the state of the optical disc resulting from erasure according to the erasure information. Subsequently, the controller closes the session. After closing the session, the controller physically erases the data to be erased which has been recorded on the optical disc.