Space Bitmap Segmentation for High-Capacity Disc Management
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Solution Overview
Problem
High-capacity storage media, such as Blu-ray discs, face increased disc management information requirements due to higher densities and layer capacities, leading to insufficient space in existing bitmaps to represent the recording status of all recording and reproducing unit blocks, necessitating a method to effectively manage and distinguish between primary and additional bitmaps.
Innovation Solution
A computer-readable storage medium and apparatus that utilize a temporary disc management area with a space bitmap including header information to differentiate between a predetermined space bitmap and an additional space bitmap, where the additional bitmap is assigned when the primary bitmap's space is insufficient, using start address information to distinguish and manage the recording status of recording and reproducing unit blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high capacity storage media are used to increase storage density, then storage capacity is improved, but the amount of disc management information increases causing insufficient space in the predetermined space bitmap
Solution Approach 1:
The space bitmap is segmented into a predetermined space bitmap and an additional space bitmap. The predetermined space bitmap manages a first range of recording and reproducing unit blocks, while the additional space bitmap manages a second range of unit blocks. This segmentation allows the system to handle high-capacity storage media by dividing the management information into multiple manageable parts, resolving the contradiction between increased storage capacity and increased disc management information complexity.
2Quantity of substance
If the number of recording and reproducing unit blocks increases to accommodate high capacity, then storage capacity is improved, but the predetermined space bitmap cannot represent all unit block statuses
Solution Approach 1:
The patent introduces an additional dimension to the space bitmap structure by creating a hierarchical organization with a predetermined space bitmap and an additional space bitmap. This dimensional expansion allows the system to represent statuses of a larger number of unit blocks by distributing the bitmap representation across multiple structured components, effectively solving the limitation of fixed-size bitmaps in high-capacity storage scenarios.
3Loss of information
If additional space bitmap is introduced to manage insufficient space, then recording status representation is improved, but discrimination between predetermined and additional space bitmaps becomes necessary
Solution Approach 1:
The patent applies preliminary action by pre-defining the structure and organization of the additional space bitmap alongside the predetermined space bitmap. The system establishes in advance how these bitmaps are differentiated and organized, including predetermined rules for when and how the additional bitmap is activated. This preliminary structuring reduces the complexity of discrimination during operation, as the system follows pre-established protocols rather than requiring complex real-time decisions about bitmap usage.
Data Source
AI summary
A computer readable medium, apparatus, and method for efficiently managing a space bitmap. A computer readable medium includes: a user data area on which user data is recorded; and a temporary disc management area on which a space bitmap indicating a recording status of recording and reproducing unit blocks of the user data area is recorded. The space bitmap includes header information for distinguishing an additional space bitmap from the space bitmap. The additional space bitmap is assigned when a space provided for the space bitmap is insufficient to represent the recording status of the recording and reproducing unit blocks of the user data area.