Multi-Reader Stacks for High-Density Magnetic Storage
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Solution Overview
Problem
Current magnetic storage devices face challenges in reading multiple tracks efficiently due to their close proximity, as existing technologies struggle to maintain resolution and accuracy with tracks spaced very closely together.
Innovation Solution
The development of a multi-reader device with two reader stacks configured in close proximity, typically within 100 nanometers of each other, allowing simultaneous reading from multiple tracks by using a mandrel to position the reader stacks and employing conformal coating and etching techniques to achieve precise placement and electrical isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple tracks are placed in close proximity to increase storage density, then data storage capacity is improved, but reading accuracy and resolution deteriorate
Solution Approach 1:
The reader head is divided into multiple independent reader stacks (first reader stack, second reader stack, etc.), each capable of reading from a separate track. This segmentation allows each reader to independently read from its assigned track without interference, maintaining reading accuracy even when tracks are placed in close proximity.
Solution Approach 2:
Multiple reader stacks are arranged in the lateral dimension across different tracks rather than stacking them vertically. This lateral arrangement in close proximity (within 100 nanometers) enables simultaneous reading from multiple tracks while maintaining the ability to distinguish between adjacent tracks through precise positioning and magnetic field isolation.
2Productivity
If reader stacks are placed within 100 nanometers of each other to read multiple tracks simultaneously, then productivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
Mandrels are formed first as precise templates before the reader stacks are constructed around them. These mandrels are positioned with the required precision (within 100 nanometers) during the formation process, and then the reader stacks are built conformally around these pre-positioned mandrels. This preliminary positioning of mandrels ensures the final reader stacks achieve the required close proximity without requiring ultra-precise placement of the readers themselves.
Solution Approach 2:
Mandrels serve as intermediary structures that facilitate the precise positioning of reader stacks. The mandrels are formed, positioned, and then used as templates around which the reader stacks are constructed. This intermediary approach allows the complex task of placing multiple readers within 100 nanometers to be achieved through a standardized mandrel formation process rather than direct reader placement.
3Device complexity
If conventional single-reader heads are used on high-density disks, then device complexity is minimized, but data reading efficiency deteriorates
Solution Approach 1:
Multiple reader stacks that would traditionally be separate devices are merged into a single integrated reader head assembly. The first reader stack, second reader stack, and additional reader stacks are combined in close proximity within one head, allowing them to function as a unified device while maintaining the capability to read from multiple tracks simultaneously, thus improving efficiency without proportionally increasing complexity.
Solution Approach 2:
The reader head is designed with multi-functionality by incorporating multiple reader stacks that can simultaneously read from multiple different tracks. This universal reader head can adapt to reading from any combination of tracks on the disk, providing enhanced productivity while maintaining a relatively simple overall device structure compared to having multiple separate reader heads.
Data Source
AI summary
In accordance with one embodiment, a multi-reader can be manufactured so as to be able to read from multiple regions of a storage device contemporaneously during operation. Such a device can be configured, for example, by forming a first wall; forming a second wall; and utilizing the first wall and the second wall to form two adjacent reader stacks.