Dynamic Metadata Mirror Area for Storage Capacity Optimization
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Solution Overview
Problem
Existing file systems like UDF 2.6 for Blu-ray Discs consume considerable storage capacity for management information, reducing the available space for user data by requiring a fixed, large metadata mirror area regardless of actual metadata size.
Innovation Solution
A recording/reproduction apparatus that dynamically sets the size of the management information backup area based on the actual size of metadata stored, allocating this space from the user data area and adjusting it as user data is recorded, thereby optimizing user data area capacity utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed, large metadata mirror area is allocated regardless of actual metadata size, then reliability of metadata backup is improved, but storage capacity for user data deteriorates
Solution Approach 1:
The patent implements a dynamic metadata mirror area that automatically adjusts its size based on the actual metadata volume. The mirror area expands when metadata grows and contracts when metadata shrinks, transforming the static allocation into a dynamic resource that adapts to actual needs, thereby eliminating waste while ensuring adequate backup capacity.
Solution Approach 2:
The patent changes the size parameter of the metadata mirror area from a fixed value to a variable value that depends on actual metadata size. By monitoring metadata volume and adjusting the mirror area parameter accordingly, the system optimizes the balance between backup reliability and storage efficiency, allowing the mirror area to be exactly the size needed at any given time.
2Speed
If concentrated placement for management information is used, then access speed to target files is improved, but storage efficiency deteriorates due to redundant metadata mirroring
Solution Approach 1:
The patent applies dynamics by making the metadata mirror area size variable rather than fixed. The mirror area dynamically adjusts to match actual metadata volume, ensuring concentrated placement for fast access while eliminating the waste of allocating excessive space, thereby resolving the contradiction between access speed and storage efficiency.
Solution Approach 2:
The patent changes the size parameter of the metadata mirror area based on actual metadata volume. This parameter adjustment allows the system to maintain concentrated placement (improving access speed) while optimizing the mirror area size to match actual needs (improving storage efficiency), thus resolving the contradiction.
Data Source
AI summary
Provided is a recording/reproduction apparatus capable of securing a backup area for management information on a recording medium without affecting the capacity of a user data area. Before a hard disk drive or a disc medium (recording medium) is finalized, metadata is recorded in a metadata area and when the hard disk drive or the disc medium are finalized, a user data area portion corresponding to the volume of metadata required for the finalizing is set as a metadata mirror area and then the metadata recorded in the metadata area is copied to the metadata mirror area.