Narrow Servo Patterns for High-Density Sequential Storage
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Solution Overview
Problem
Existing sequential information storage media face limitations in data band capacity and positioning accuracy due to the conventional arrangement of servo and data bands, which restricts the number of data tracks that can be read or written simultaneously and affects the precision of linear and longitudinal positioning of read/write heads.
Innovation Solution
The proposed solution involves encoding a greater number of data bands and using servo patterns with reduced width to increase data storage capacity and enhance positioning accuracy, allowing for simultaneous reading/writing of (2N+1) data tracks and improved linear and longitudinal positioning by encoding more LPOS words with narrower servo patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional servo bands with standard width are used, then positioning accuracy is maintained at baseline levels, but the number of data bands that can be encoded is limited
Solution Approach 1:
The servo band is segmented into multiple narrower servo patterns (e.g., two servo bands instead of one, with each containing multiple servo patterns). This segmentation allows the storage medium to accommodate more data bands between servo bands while maintaining sufficient servo patterns for positioning accuracy. The servo band width is divided into smaller units that can support both increased data capacity and precise head positioning.
Solution Approach 2:
The invention transitions from a single servo band configuration to a multi-servo band configuration with reduced individual pattern widths. By changing the dimensional arrangement from one wide servo band to multiple narrower bands, the system achieves both increased data band capacity and maintained positioning precision through the distributed servo patterns across multiple bands.
2Quantity of substance
If the number of data bands is increased, then storage capacity is improved, but the width available for each servo pattern is reduced
Solution Approach 1:
Instead of using one wide servo band, the system uses multiple narrower servo bands (e.g., two servo bands with reduced individual widths). This segmentation allows the total servo functionality to be distributed across multiple bands, enabling more data bands to be encoded in the remaining space while each servo band maintains sufficient width for its assigned servo patterns.
Solution Approach 2:
Different regions of the storage medium are assigned different functions: narrower servo bands for positioning and broader data bands for storage. By optimizing the local width allocation where servo bands are narrower and data bands are wider, the system achieves both precise positioning and high storage capacity simultaneously.
3Device complexity
If fewer servo patterns are used per LPOS word, then encoding complexity is reduced, but positioning resolution deteriorates
Solution Approach 1:
The LPOS encoding is segmented across multiple servo patterns distributed across different servo bands. Instead of concentrating all servo patterns in a single wide band, the system distributes them across multiple narrower bands, allowing for simpler individual pattern designs while maintaining high positioning resolution through the collective information from multiple patterns.
Data Source
AI summary
A sequential information storage medium, comprising a plurality of servo patterns encoded lengthwise thereon, wherein each servo pattern encodes at least one LPOS bit and comprises a width less than 187 microns.