Magnetic Disk Head Positioning via Multi-Reader Data Synthesis
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Solution Overview
Problem
Magnetic disk devices face errors in demodulation of positioning data due to shifts and gaps between readers, affecting the accuracy and efficiency of magnetic head positioning.
Innovation Solution
A magnetic disk device with two readers positioned differently in the circumference and radius directions, where a controller synthesizes positioning data from both readers based on evaluation data to improve positioning accuracy by adjusting the mixture ratio of their servo generation waveforms, thereby reducing errors and enhancing position linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple readers are used to perform resume with respect to multiple recording tracks at the same time, then transfer rate is improved, but errors in demodulation of positioning data occur due to shifts and gaps between readers
Solution Approach 1:
The patent introduces a positioning data synthesis unit that acts as an intermediary to process and synthesize positioning data from multiple readers. This synthesis unit combines the positioning information while compensating for shifts and gaps between readers, thereby maintaining high transfer rates while improving positioning accuracy through coordinated data fusion rather than direct independent reading
Solution Approach 2:
The patent adjusts operational parameters of the readers including their relative positions, reading timing, and synchronization to optimize both transfer rate and positioning accuracy. By dynamically changing these parameters based on the specific configuration of multiple readers, the system achieves high productivity while minimizing demodulation errors
2Productivity
If readers are positioned at different positions to read positioning information, then positioning efficiency is improved, but errors in demodulation occur due to shifts and gaps between readers
Solution Approach 1:
The patent implements a feedback mechanism where the system evaluates the quality and accuracy of positioning data from each reader, then uses this feedback to adjust the synthesis process. The synthesis unit incorporates error compensation based on detected shifts and gaps, continuously optimizing the positioning accuracy while maintaining the efficiency benefits of multiple readers positioned at different locations
Solution Approach 2:
The patent creates a composite positioning data structure by synthesizing information from multiple readers with different positions. This composite approach combines the strengths of each reader's positioning data while compensating for their individual weaknesses, achieving both high positioning efficiency and reliability through data fusion
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves the accuracy and efficiency of magnetic head positioning by synthesizing servo data from multiple readers, reducing errors in demodulation and enhancing position linearity, while also shortening the BurstA&B part of the servo generation waveform.
Implementation Method 1
a magnetic head including a first reader and a second reader positioned in a different position than the first reader, a controller configured to position the magnetic head based on first positioning data obtained by the first reader reading the positioning information
Data Source
AI summary
According to one embodiment, the controller of the magnetic disk drive configured to synthesize the first positioning data and second positioning data obtained by the second reader reading the positioning information based on the evaluation data, and performs positioning of the magnetic head based on the synthesized positioning data.