Shingled Magnetic Recording Head With Staggered Bit Tracks
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Solution Overview
Problem
Current magnetic storage technologies face challenges in reducing read track width dimensions, which affects the areal density and performance of magnetic media, particularly in shingled magnetic recording (SMR) systems, where there is no effective solution to alleviate read track width reduction.
Innovation Solution
A magnetic head with a reader element capable of reading data from at least two adjacent data tracks in a single pass, where the reader element has a width larger than a single data track and the bits in adjacent tracks are arranged in a staggered orientation, allowing the centers of the bits not to lie on a common line in the cross-track direction, enabling efficient data reading and writing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If shingled magnetic recording is used to increase areal density, then storage capacity is improved, but read track width dimensions are reduced making it difficult to read data
Solution Approach 1:
The patent combines multiple adjacent data tracks into a single wide data structure that can be read concurrently. The reader element reads from multiple adjacent tracks simultaneously, merging the data from these tracks into one coherent data stream, thereby maintaining effective read width despite individual track width reductions.
Solution Approach 2:
The patent transitions from reading single tracks sequentially to reading multiple tracks concurrently in a single pass. By utilizing the cross-track dimension to access multiple tracks simultaneously, the system compensates for reduced individual track widths while maintaining overall read capability.
2Reliability
If bits in adjacent tracks are arranged in staggered orientation, then reading interference is reduced, but data organization complexity increases
Solution Approach 1:
The patent employs asymmetric staggering patterns where bits in adjacent tracks are deliberately offset from each other in a non-uniform manner. This asymmetric arrangement prevents direct alignment of bits from different tracks, minimizing read interference while the controller manages the resulting data organization through coordinated write operations.
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 solution enhances data storage capacity by allowing concurrent reading and writing of data across multiple tracks without interference, alleviating the need for reduced read sensor technology dimensions and maintaining high storage density.
Implementation Method 1
a writer element adapted for writing data successively to at least two adjacent data tracks of the magnetic medium
Implementation Method 2
a reader element adapted for reading data concurrently from at least two adjacent data tracks of a magnetic medium in a single pass
Data Source
AI summary
In one embodiment, a magnetic data storage system includes a bit patterned magnetic medium, wherein centers of bits in adjacent data tracks do not lie on a common line in a cross-track direction, a magnetic head having a writer element having a width greater than a width of a data track in a track width direction adapted for writing data successively to at least two adjacent data tracks of the magnetic medium, and a reader element having a width larger than the width of a data track in the track width direction adapted for reading data concurrently from the at least two adjacent data tracks of the magnetic medium in a single pass, a drive mechanism for passing the magnetic medium over the magnetic head, and a controller electrically coupled to the magnetic head for controlling operation of the magnetic head.