Magnetic Tape Recording Device Index Segmentation
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Solution Overview
Problem
The effective capacity of portable recording media, such as magnetic tapes, decreases due to the increasing size of indices that store information about recorded data positions, leading to reduced storage efficiency for large volumes of data.
Innovation Solution
A recording device that periodically records metadata in sets, allowing for efficient management of data partitions by transferring metadata sets between data and reference partitions, thereby minimizing the size of indices and maintaining effective capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If all recorded data positions are included in the index, then data management capability is improved, but index size increases and effective capacity decreases
Solution Approach 1:
The index is divided into multiple parts: a first index recorded in the data partition containing positions of data recorded up to a certain point, and a second index recorded in the reference partition containing positions of data recorded after that point. This segmentation allows the index functionality to be distributed, preventing any single index from becoming too large and reducing the impact on effective capacity.
Solution Approach 2:
The patent extracts the index recording function from being solely in the data partition and creates a separate reference partition for storing the second index. This extraction allows the system to maintain comprehensive data position tracking while isolating the growth of large indices from the data partition, thereby preserving effective capacity.
2Measurement precision
If index size increases to track all data positions, then data tracking accuracy is improved, but storage efficiency deteriorates
Solution Approach 1:
By segmenting the index into first and second indices stored in different partitions, the system maintains accurate tracking of all data positions while preventing any single index from consuming excessive storage space, thus preserving storage efficiency.
Solution Approach 2:
The patent introduces a new dimension by creating a reference partition separate from the data partition. This dimensional separation allows the index information to be stored in a different space, enabling comprehensive data tracking without compromising the storage efficiency of the data partition.
3Manufacturing precision
If metadata is recorded frequently, then data management precision is improved, but recording overhead increases
Solution Approach 1:
The metadata recording is segmented into two phases: first metadata recorded in the data partition during normal data recording, and second metadata recorded in the reference partition when needed. This segmentation allows precise data management while distributing the recording overhead across different operations rather than requiring frequent updates to a single large index.
Data Source
AI summary
A recording device includes: a recording unit that records plural objects including data and metadata related to the data on a portable recording medium, and executes a process of recording first set data, which is a set of the metadata included in the object, at every predetermined timing after recording at least one of the objects, wherein each piece of the first set data is a set of the metadata included in the object recorded after recording of immediately preceding recorded first set data.