Magnetic Disk Drive Head Adjusting Method
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Solution Overview
Problem
Magnetic disk drives face challenges in achieving high recording density and capacity while maintaining data reliability, as existing techniques like MAMR and TAMR have limitations in adjusting head characteristics to optimize recording performance across multiple surfaces of disks.
Innovation Solution
A magnetic disk drive configuration with multiple heads and assist elements, including a spin torque oscillator, that adjusts recording density and energy supply to optimize write performance across different surfaces, using a controller to dynamically adjust recording parameters based on capacity and error rate measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If MAMR or TAMR techniques are used to achieve higher recording density and capacity, then recording capacity is improved, but head characteristics cannot be optimized across multiple disk surfaces
Solution Approach 1:
The magnetic disk drive is divided into multiple independent head assemblies, each equipped with its own assist element (spin torque oscillator or thermal assist element). This segmentation allows each head to be independently adjusted and optimized for its specific disk surface, enabling tailored recording density and performance optimization for each surface while maintaining high overall recording capacity.
2Quantity of substance
If recording density is increased to improve recording capacity, then recording capacity is improved, but data reliability deteriorates
Solution Approach 1:
The system applies local quality by providing individualized assist elements and independent adjustment capabilities for each head assembly. This allows optimal recording parameters to be applied locally at each head-disk interface, ensuring that each recording operation occurs under ideal conditions that maximize both recording density and data reliability, rather than using uniform parameters across all surfaces.
Solution Approach 2:
The controller receives feedback from multiple heads writing on different surfaces and dynamically adjusts recording parameters based on performance measurements from each surface. This feedback mechanism enables the system to optimize recording density and maintain data reliability by adapting to the specific characteristics of each disk surface and head assembly.
3Adaptability or versatility
If multiple heads with independent assist elements are used to optimize each surface, then adaptability is improved, but device complexity increases
Solution Approach 1:
The system employs multiple heads with identical or similar assist element configurations, where each head assembly serves as a universal module capable of operating on different disk surfaces. This modular universality allows the system to achieve high adaptability across surfaces while managing complexity through standardized, interchangeable components rather than entirely unique designs for each head.
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
Enhances data reliability and recording capacity by optimizing recording density and energy supply across multiple disk surfaces, improving write performance and reducing errors through dynamic adjustment of recording parameters.
Implementation Method 1
a spin torque oscillator, in which a high-frequency magnetic field generated by energizing the spin torque oscillator is applied to a disk so as to reduce a coercive force of a portion of the disk to which the high-frequency magnetic field is applied
Implementation Method 2
a magnetic head having a light irradiation element that radiates irradiation light toward a disk, so that the disk is irradiated with the irradiation light from the tip of the light irradiation element and the disk is locally heated so as to reduce a coercive force of a heated portion of the disk
Data Source
AI summary
A magnetic disk drive includes first and second disks having respective first and second surfaces, a first head including a first write head that writes data on the first surface at a first recording density, and a first assist element that generates a first energy for increasing a write performance by the first write head, a second head including a second write head that writes data on the second surface at a second recording density, and a second assist element that generates a second energy for increasing a write performance by the second write head, and a controller that changes one of the first and second recording densities based on a first recording capacity up to which the first head is capable of writing on the first disk, a second recording capacity up to which the second head is capable of writing on the second disk, and a target capacity.