Continuous Frequency Servo Tracks in Data Storage Devices
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Solution Overview
Problem
Existing data storage devices face inefficiencies in format design due to zoned servo configurations, which can lead to loss of synchronization when crossing servo zone boundaries, requiring transition zones that consume valuable space and reduce format efficiency.
Innovation Solution
Implementing a data storage device with servo tracks that have continuously varying frequencies across adjacent tracks, allowing for precise adjustments in servo frequency based on radial position, eliminating the need for transition zones and enhancing format efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If zoned servo configurations are used, then servo frequency can be adjusted for different radial positions, but synchronization is lost when crossing servo zone boundaries
Solution Approach 1:
The patent applies parameter changes by continuously varying the servo frequency as a function of radial position rather than using discrete zoned frequency adjustments. This allows the servo system to adapt to changing linear bit density requirements across the disk radius while maintaining continuous synchronization, eliminating the synchronization loss that occurs at zone boundaries in traditional zoned configurations.
Solution Approach 2:
The patent implements dynamics by transitioning from static zoned frequency assignments to dynamic continuous frequency adjustment. The servo frequency is continuously modified based on the current radial position of the head, enabling the system to respond smoothly to position changes and maintain synchronization stability while crossing what would traditionally be zone boundaries.
2Reliability
If transition zones are added between servo zones, then synchronization stability is improved, but format efficiency and storage capacity are reduced
Solution Approach 1:
The patent extracts and eliminates the transition zones from the servo format by implementing continuous frequency adjustment. Instead of requiring dedicated transition zones between servo zones to maintain synchronization stability, the system achieves smooth frequency transitions across the entire disk surface through continuous parameter adjustment, thereby recovering the storage capacity that would otherwise be wasted in transition zones.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining continuous servo frequency adjustment across the entire disk radius without interruption or discontinuity at zone boundaries. This eliminates the need for non-data-storing transition zones, as the frequency adjustment occurs continuously throughout the servo zones, maximizing the usable storage capacity while maintaining synchronization stability.
3Device complexity
If constant servo frequency is used across all tracks, then device complexity is reduced, but signal-to-noise ratio fluctuations increase
Solution Approach 1:
The patent applies local quality by assigning different servo frequencies to different radial positions on the disk rather than using a single constant frequency for all tracks. Each radial position receives a frequency optimized for its specific linear bit density requirements, improving signal-to-noise ratio locally at each position while the overall system complexity remains manageable through the use of continuous mathematical functions to define the frequency-position relationship.
Data Source
AI summary
Example storage medium servo patterns, data storage devices, and methods to provide servo tracks with continuously varying frequency in a data storage device are described. The data storage device may include storage media, such as magnetic disks, having servo sectors that define servo tracks, where adjacent servo tracks have continuously varying frequency as the head moves from one servo track to the next. As the head is actuated over the storage medium, a target track frequency may be determined based on the radial position of a target servo track and the channel frequency may be set to the target track frequency to follow the target servo track.