Multi-Transducer Read Head for Interlaced Magnetic Tracks
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Solution Overview
Problem
Interlaced magnetic recording (IMR) tracks present challenges in reading data due to differing characteristics such as track width, linear bit density, and signal-to-noise ratio between top and bottom tracks, leading to higher error rates and potential data loss if the read transducer characteristics do not match those of the tracks.
Innovation Solution
A read head with multiple read transducers, each optimized for specific track characteristics, is used, where a controller selects the appropriate transducer for reading either the top or bottom tracks, allowing for improved performance by matching the read transducer design to the specific track characteristics, thereby reducing read error rates and maintaining high areal density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single read transducer design is used for all tracks, then device complexity is reduced, but read error rates increase due to mismatched characteristics between top and bottom tracks
Solution Approach 1:
The read head is segmented into multiple independent read transducers (first read transducer and second read transducer), each with different crosstrack widths and shield-to-shield spacings. The first read transducer is optimized for reading bottom tracks with wider spacing, while the second read transducer is optimized for reading top tracks with narrower spacing. This segmentation allows each transducer to be specifically tailored to its target track type, thereby reducing read error rates without requiring a single complex adjustable design.
Solution Approach 2:
Different regions of the read head are given different characteristics to match the local requirements of different track types. The first read transducer has a first crosstrack width and first shield-to-shield spacing optimized for bottom tracks, while the second read transducer has a second crosstrack width and second shield-to-shield spacing optimized for top tracks. This local quality approach ensures that each transducer operates at optimal performance for its specific track type.
2Measurement precision
If multiple read transducers with different characteristics are used, then reading performance for both top and bottom tracks is improved, but device complexity increases
Solution Approach 1:
The read head is divided into specialized segments (first and second read transducers) with distinct geometric parameters. Each transducer's crosstrack width and shield-to-shield spacing are independently optimized for specific track types, enabling precise reading of both top and bottom tracks simultaneously without requiring complex real-time adjustment mechanisms.
Solution Approach 2:
The patent applies parameter changes by varying the crosstrack width and shield-to-shield spacing parameters between the first and second read transducers. These parameter variations are specifically designed to match the different characteristics of top and bottom tracks, thereby improving measurement precision while maintaining a relatively simple fixed-structure read head design.
3Measurement precision
If read transducer characteristics are optimized for one track type, then reading accuracy for that track type improves, but adaptability to read other track types deteriorates
Solution Approach 1:
The read head achieves multi-functionality by incorporating multiple read transducers with different optimized characteristics. The first read transducer handles bottom tracks while the second read transducer handles top tracks, allowing a single read head assembly to universally read both track types with high accuracy. This eliminates the need for separate read heads for different track types.
Solution Approach 2:
By segmenting the read head into specialized transducers, each segment can be optimized for a specific function (reading bottom or top tracks), while the overall system maintains versatility through the combination of segments. This segmentation approach resolves the contradiction between specialization and adaptability.
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 reduces read error rates and maintains high areal density by optimizing read transducer design for specific track characteristics, enhancing data retrieval efficiency in IMR systems.
Implementation Method 1
a first read transducer having a first crosstrack width and a first shield-to-shield spacing that are optimized to read a first track width and a first linear bit density
Data Source
AI summary
First tracks of a disk are read via a first read transducer. The first read transducer has a first crosstrack width and a first shield-to-shield spacing that are optimized to read a first track width and a first linear bit density of the first tracks. Second tracks interlaced between the first tracks are read via a second read transducer. The second read transducer has a second crosstrack width different from the first crosstrack width and second shield-to-shield spacing different than the first shield-to-shield spacing. The second crosstrack width and the second shield-to-shield spacing are optimized to read a second track width different from the first track width and a second linear bit density different from the first linear bit density.