Magnetic Head Servo Layout for SMR Track Alignment
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Solution Overview
Problem
Existing magnetic tape systems face challenges in accurately aligning the reading position of servo patterns during data reproduction, particularly in shingled magnetic recording (SMR) methods, leading to misalignment issues.
Innovation Solution
A magnetic head design with multiple servo reading elements and recording/reproducing modules, where the recording and reproducing elements are shifted and aligned to match the pitch and length of data tracks formed by SMR, ensuring precise alignment and data reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If shingled magnetic recording (SMR) method is used to increase data storage density, then storage capacity is improved, but alignment precision of servo patterns during reproduction deteriorates
Solution Approach 1:
The magnetic head is divided into separate recording module and reproducing module, each with dedicated servo reading elements. The recording module includes first and second recording elements with different track pitches, while the reproducing module has corresponding reproducing elements. This segmentation allows independent optimization of recording and reproducing functions to handle the alignment challenges of SMR.
Solution Approach 2:
Different servo reading elements are positioned at specific locations corresponding to different track pitches. The first servo reading element reads servo patterns from tracks recorded by the first recording element, while the second servo reading element reads from tracks recorded by the second recording element. This local quality approach ensures each element operates at its optimal position for the specific track pitch it serves.
2Adaptability or versatility
If multiple recording elements with different track pitches are used for SMR, then storage flexibility is improved, but device complexity increases
Solution Approach 1:
Multiple recording elements and reproducing elements are integrated into a single magnetic head assembly. The recording module combines first and second recording elements with different track pitches, and the reproducing module combines corresponding reproducing elements. This merging allows the system to handle multiple track pitches with a unified structure rather than requiring separate heads for each pitch.
Solution Approach 2:
The magnetic head is designed with multi-functionality to handle both recording and reproducing operations for different track pitches. The recording module can record data on tracks with different pitches, and the reproducing module can reproduce data from those same tracks. This universal design allows a single head to serve multiple functions that would otherwise require separate specialized components.
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
The solution enables accurate alignment of servo patterns with data tracks, improving data reading and writing precision and efficiency in magnetic tape systems.
Implementation Method 1
a magnetic head provided with a plurality of servo reading elements corresponding to a plurality of servo bands in which a plurality of servo patterns are recorded
Implementation Method 2
performing recording of data on the magnetic tape and reproducing of the data from the magnetic tape
Data Source
AI summary
The magnetic head comprises a recording module in which a plurality of recording elements are provided, and a reproducing module in which a plurality of reproducing elements are provided. The recording module and the reproducing module are disposed along a longitudinal direction of the magnetic tape. A pair of first servo reading elements of the recording module and a pair of second servo reading elements of the reproducing module are shifted from each other by a predetermined difference along one direction in the width direction of the magnetic tape. The predetermined difference is defined based on a pitch between a plurality of tracks formed using an SMR method and a length of the recording element in the width direction of the magnetic tape.