Skewed Data Reader for Shingled Magnetic Recording
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Solution Overview
Problem
Data storage devices face challenges in maintaining a high signal-to-noise ratio (SNR) due to increased data bit density and overlapping shingled data tracks, which reduce the exposed size of data bits and make them difficult to detect effectively.
Innovation Solution
A data storage device with a transducing head featuring a data reader and writer, where the reader centerline is skewed with respect to the track centerline, allowing better positioning and accommodation of varying data bit sizes and shingled data track positions to optimize data reading performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If data bits are arranged in shingled data tracks to increase data capacity, then data capacity increases, but the exposed size of data bits decreases making them difficult to detect
Solution Approach 1:
The data reader is positioned asymmetrically with its centerline offset from the track centerline. This asymmetric positioning allows the reader to be optimally aligned with the exposed portion of shingled data bits, maximizing the detected signal while accommodating the overlapping track geometry inherent in shingled magnetic recording.
Solution Approach 2:
The reader position is specifically optimized for the local geometry of shingled data bits. By positioning the reader centerline at a predetermined offset from the track centerline, the system adapts the read head's local position to match the exposed portion of data bits in shingled tracks, thereby improving signal detection despite reduced exposure.
2Manufacturing precision
If data writer centerline is aligned with track centerline for accurate writing, then writing accuracy is maintained, but data reader cannot optimally detect shingled data bits
Solution Approach 1:
The system intentionally creates an asymmetric configuration where the data reader centerline is offset from the data writer centerline. The writer remains aligned with the track centerline for accurate data writing, while the reader's asymmetric position optimizes detection of the exposed portion of shingled data bits, resolving the conflict between writing accuracy and reading sensitivity.
Solution Approach 2:
Different components of the transducing head are positioned with different local optimizations: the writer is positioned at the track centerline for optimal writing performance, while the reader is positioned with a predetermined offset to optimize reading performance on shingled tracks. This allows each component to operate at its local optimum.
Data Source
AI summary
A data storage device may be configured with at least a transducing head separated from a data storage medium. The transducing head can have a data reader and data writer. A plurality of data bits may be arranged in first and second shingled data tracks on the data storage medium. The data writer can be configured with a writer centerline aligned with a track centerline of the first shingled data track and a data reader having a reader centerline skewed with respect to the track and writer centerlines.