Dual Writer Head Design for Interlaced Magnetic Recording
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In magnetic data storage, as cell size decreases to increase data storage density, writing data to smaller cells with larger write poles can affect adjacent cells' polarization, leading to performance setbacks and manufacturing challenges, particularly in interlaced magnetic recording systems where track widths and write pole placement are critical.
Innovation Solution
A transducer head with two writers of different sizes, separated in the down-track direction, allows for independent operation to write data tracks of varying widths, facilitating interlaced magnetic recording by generating magnetic fields that polarize regions of different sizes, thereby improving areal bit density and reducing cross-track separation for enhanced device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a larger write pole is used to write data to smaller cells, then data storage density is improved, but adjacent cells' polarization is affected (overwriting)
Solution Approach 1:
The write pole is segmented into multiple independent write elements (first write element, second write element, third write element) with different widths. Each write element can be independently activated to write to specific track regions, allowing precise control over the written area and preventing interference with adjacent cells that would occur with a single large write pole.
Solution Approach 2:
Different regions of the storage medium are written using write elements with locally optimized properties. The first write element has a narrower width suitable for writing to outer tracks, while the second and third write elements have wider widths suitable for inner tracks. This local quality matching ensures optimal write performance without affecting adjacent cells.
2Adaptability or versatility
If writers with two differently-sized write poles are used to create tracks of different write widths, then interlaced magnetic recording is enabled, but manufacturing challenges arise regarding write pole placement
Solution Approach 1:
Multiple write elements with different widths are merged into a single integrated write pole structure. This unified structure is manufactured as one piece, eliminating the need for separate placement of multiple write poles and thereby resolving the manufacturing challenges associated with precise write pole placement while maintaining interlaced magnetic recording capability.
Solution Approach 2:
The integrated write pole structure serves multiple functions by incorporating write elements of different widths within a single structure. This universal design enables the system to write to tracks of varying widths without requiring separate write poles, simplifying manufacturing while maintaining versatility for interlaced magnetic recording.
3Device complexity
If a single writer is used, then device complexity is reduced, but areal bit density cannot be sufficiently improved
Solution Approach 1:
The single writer is segmented into multiple write elements (first, second, and third write elements) with different widths, each capable of writing to specific track regions. This segmentation increases areal bit density by enabling more efficient space utilization while maintaining a relatively simple integrated structure that avoids excessive device complexity.
Solution Approach 2:
The write elements are arranged in the cross-track dimension with different widths, allowing the system to write to tracks of varying widths. This dimensional arrangement increases areal bit density without significantly increasing device complexity, as all elements are integrated within a single write pole structure.
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 configuration enhances data storage density and performance by allowing for precise control over write pole placement, minimizing cross-track separation, and maintaining readability of data tracks, even as they overlap, thus overcoming the limitations of conventional recording techniques.
Implementation Method 1
two writers separated from one another in a down-track direction of a data track on the storage medium... generating magnetic fields that polarize regions of different sizes
Data Source
AI summary
A storage device includes a storage medium and a transducer head with two writers positioned to write to a same surface of the storage medium. The two writers are separated from one another along a down-track direction of a data track on the storage medium and independently controllable to write data.