Dual Writer Head Design for Interlaced Magnetic Recording
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current magnetic recording technologies face challenges in increasing area storage density while maintaining performance, as smaller write elements can affect adjacent cells, leading to overwriting issues in shingled magnetic recording (SMR) systems.
Innovation Solution
A transducer head with two write elements of different pole widths is used, allowing for selective writing to a magnetic storage medium, enabling interlaced magnetic recording (IMR) that increases areal density capability with reduced bit error rates by alternating data tracks of varying widths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the write element size is decreased to increase area storage density, then the areal density capability is improved, but adjacent cells may be affected and overwritten during write operations
Solution Approach 1:
The write head is divided into multiple independent write elements (first write element with first write width, second write element with second write width) that can be selectively activated. This segmentation allows the system to use different write widths for different data tracks, preventing adjacent cell overwriting while maintaining high areal density.
Solution Approach 2:
Different write elements are assigned different write widths tailored to specific track requirements. The first write element has a first write width optimized for first data tracks, while the second write element has a second write width optimized for second data tracks. This local optimization ensures each track is written with the appropriate write width, preventing interference with adjacent cells.
2Quantity of substance
If shingled magnetic recording is used to increase areal density, then the area storage density is improved, but system performance deteriorates due to the need to re-write multiple tracks when changing a single data cell
Solution Approach 1:
The write head is segmented into multiple independent write elements that can be selectively activated based on the specific track being written. This allows random access to individual tracks without requiring re-writing of adjacent tracks, thereby maintaining system performance while achieving high areal density through shingled magnetic recording.
Solution Approach 2:
The system dynamically selects which write element to use based on the target track, enabling flexible and efficient data writing operations. This dynamic selection allows the system to adapt to different track requirements and access patterns, improving overall system performance.
3Device complexity
If a single write element is used for all tracks, then the device complexity is reduced, but the ability to optimize write width for different tracks is limited
Solution Approach 1:
The write head is divided into multiple write elements, each optimized for specific track widths. This segmentation provides the adaptability needed to handle different track configurations while maintaining a relatively simple overall structure that builds upon conventional write head designs.
Solution Approach 2:
The write head structure is designed to perform multiple functions by selectively activating different write elements for different track types. This multi-functionality allows a single write head to handle both narrow and wide tracks, as well as different track densities, without requiring separate write heads for each configuration.
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 enhances storage device performance and area storage density while minimizing the impact on adjacent data tracks, providing a higher total areal density with lower observable bit error rates compared to conventional magnetic recording systems.
Implementation Method 1
a strong write field is needed to shift the polarity of cells on a magnetized medium
Implementation Method 2
causing thermal protrusion of the write element
Data Source
AI summary
A storage device includes a transducer head with multiple write elements having write poles of different sizes. For example, the transducer head may include two write poles of different width configured to write to a same surface of a storage medium. A controller of the storage device is configured to selectively engage one of the multiple write elements to write data to the storage medium.