Magnetic Disk Device Assist Element Deterioration Control
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Solution Overview
Problem
Magnetic disk devices with assist functions, such as high frequency oscillators or near field transducers, deteriorate over time, leading to decreased read/write performance and increased bit error rates, making it challenging to maintain continuous operation without compromising data integrity.
Innovation Solution
A magnetic disk device with a controller that monitors the condition of assist elements, adjusts recording conditions based on detected thresholds, and modifies the bias voltage or floating degree of the magnetic head to prevent deterioration, ensuring continuous operation and maintaining read/write performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the assist function is continued to improve read/write performance, then the read/write performance is maintained, but the assist elements deteriorate over time
Solution Approach 1:
The patent implements periodic monitoring of assist element conditions and periodically adjusts recording conditions to prevent deterioration. The controller continuously detects bit error rates and electrical resistance values, and when thresholds are exceeded, it modifies the recording process by adjusting bias voltage or head floating degree, thereby maintaining performance while preventing element degradation through periodic intervention rather than continuous operation at fixed conditions
Solution Approach 2:
The patent dynamically adjusts recording conditions based on real-time detection of assist element status. The system transitions from static recording parameters to dynamic adjustment by modifying bias voltage or head floating degree in response to detected changes in electrical resistance or bit error rate, allowing the system to adapt and maintain optimal performance while preventing element deterioration
Solution Approach 3:
The patent implements a feedback mechanism where the controller continuously monitors bit error rates and electrical resistance values of assist elements, compares them against predetermined thresholds, and automatically adjusts recording conditions when deterioration is detected. This closed-loop feedback system ensures that read/write performance is maintained while preventing further element degradation by responding to actual element status in real-time
2Reliability
If the assist function is stopped to prevent deterioration, then the reliability is improved, but the read/write performance decreases
Solution Approach 1:
The patent applies partial action by selectively adjusting only certain recording conditions (bias voltage or head floating degree) rather than completely stopping the assist function. When deterioration is detected through bit error rate or electrical resistance monitoring, the system partially modifies the recording process to prevent further element degradation while maintaining sufficient assist function to preserve acceptable read/write performance
Solution Approach 2:
The patent changes recording parameters dynamically based on assist element condition. Instead of binary on/off control, the system adjusts bias voltage levels or head floating degree parameters in response to detected deterioration, thereby maintaining element reliability while preserving read/write performance through optimized parameter selection rather than complete function cessation
3Duration of action of stationary object
If the recording condition is adjusted to prevent element deterioration, then the element life is extended, but the read/write performance may be compromised
Solution Approach 1:
The patent employs dynamic adjustment of recording conditions based on real-time monitoring of assist element status. The system continuously detects bit error rates and electrical resistance values, and only adjusts bias voltage or head floating degree when predetermined thresholds are exceeded, thereby extending element life while minimizing impact on read/write performance through condition-based dynamic control rather than continuous restriction
Solution Approach 2:
The patent implements self-service by enabling the system to automatically monitor its own assist element conditions and autonomously adjust recording parameters when deterioration is detected. The controller performs self-diagnosis through bit error rate and electrical resistance monitoring, and self-corrects by modifying bias voltage or head floating degree, thereby extending device life while maintaining performance without external intervention
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
The solution effectively suppresses the deterioration of assist elements, maintains read/write performance, and extends the life of the magnetic disk device by dynamically adjusting recording conditions in response to detected changes, thereby preventing errors and ensuring continuous data integrity.
Implementation Method 1
The assist function is a function to improve the write performance using high frequency of a high frequency oscillator
Implementation Method 2
The assist function is a function to improve the write performance using high frequency of a high frequency oscillator or near field light of a near field transducer element
Implementation Method 3
the detection part detects an electrical resistance value of the spin torque oscillator
Implementation Method 4
the determination part determines whether or not a recording condition of the magnetic head is changed based on a result of the monitoring and a threshold value
Implementation Method 5
the adjustment part changes a floating degree of the magnetic head based on the result of the determination
Implementation Method 6
a magnetic head including an assist part to assist recording of data into a magnetic disk
Data Source
AI summary
According to one embodiment, a magnetic disk device includes a magnetic disk, a magnetic head including an assist part to assist recording of data into the magnetic disk, a controller configured to control the recording of data by the magnetic head based on a recording condition, and a memory configured to record a first threshold value used to define that an assist element included in the assist part is in a deterioration condition. Furthermore, the controller detects the condition of the assist element, determines whether or not the recording condition is changed based on the detected condition and the first threshold value stored in the memory, and changes the recording condition based on the result of the determination.