Last Recorded Address Management in Write-Once Media
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Solution Overview
Problem
Conventional write-once information recording media face capacity wastage and inefficiency due to continuous changes in the last recorded address (LRA), requiring frequent updates and time-consuming identification processes.
Innovation Solution
Implementing temporary disc management information that includes first information about the last recorded location and a consistency flag to indicate whether this information matches the actual last recorded location, allowing for efficient management and reduction in unnecessary updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If every last recorded address (LRA) is recorded in the write-once information recording medium during each recording operation, then the LRA information is accurately tracked, but the storage capacity of the medium is drastically exhausted and system performance deteriorates
Solution Approach 1:
The patent extracts the LRA information management from the main data storage area by dedicating a specific region in the lead-in area for LRA recording. This separation allows LRA tracking to occur without consuming valuable user data storage capacity in the data area, resolving the contradiction between accurate LRA tracking and storage capacity preservation.
Solution Approach 2:
The patent establishes a predetermined region in the lead-in area before any data recording operations begin. This preliminary preparation provides a dedicated space for LRA information, eliminating the need to allocate space from the data area during subsequent recording operations and thus preventing storage capacity exhaustion.
2Measurement precision
If the drive system identifies the exact last recorded location of data each time after a recording operation, then the LRA information is updated accurately, but the system performance efficiency deteriorates
Solution Approach 1:
The patent introduces an intermediary mechanism by using the predetermined region in the lead-in area as a dedicated buffer for LRA information. This intermediary structure allows the drive system to update LRA data without performing complex identification operations during each recording task, thereby maintaining accuracy while improving overall system efficiency.
3Quantity of substance
If LRA information is recorded in a predetermined region in the lead-in area, then storage capacity is conserved, but the region may become insufficient when file system-related information is also recorded in the beginning or ending part
Solution Approach 1:
The patent resolves the space constraint by utilizing the lead-in area, which is a separate dimensional space from the main data area. This dimensional separation allows the predetermined region for LRA information to coexist with file system-related information in the lead-out area, ensuring both storage capacity conservation and region sufficiency for multiple information types.
Data Source
AI summary
An information recording medium, recording and/or reproducing apparatuses, and recording and/or reproducing methods which enable effective management of a last data recording address of a data area of the information recording medium. The information recording medium includes a data area for recording user data, temporary recording management information for managing a data recording status of the data area and temporary disc management information for managing the information recording medium, wherein the temporary disc management information includes first information regarding a last recorded location of data in the data area and second information regarding whether the information regarding the last recorded location is consistent with an actual last recorded location of the data area.