Fly Height Actuator Dynamic Adjustment for Head Longevity
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Solution Overview
Problem
Conventional data storage devices face challenges in maintaining a balance between maximizing data throughput and extending the life of the head, as maintaining a target fly height for optimal data recovery can lead to head wear and decreased longevity.
Innovation Solution
The fly height of the head is dynamically adjusted based on performance metrics such as throughput and power consumption, increasing it when a performance margin is detected to enhance the life of the head, and decreasing it when necessary to maintain optimal read operations, using a fly height actuator controlled by a servo system and control circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fly height is maintained at target level for optimal data recovery, then data throughput is maximized, but head wear increases and head longevity decreases
Solution Approach 1:
The patent implements dynamic fly height adjustment by monitoring performance metrics (throughput, power consumption) and automatically modifying fly height accordingly. When performance margin is detected, the system increases fly height to reduce head wear; when performance degrades, it decreases fly height to maintain optimal data recovery. This dynamic adaptation resolves the contradiction by making fly height a variable parameter rather than a fixed value.
Solution Approach 2:
The system changes the physical parameter of fly height based on operational conditions and performance metrics. By adjusting this critical parameter in response to throughput and power consumption levels, the system optimizes the trade-off between data recovery efficiency and head durability, allowing operational flexibility to balance productivity and component longevity.
2Duration of action of stationary object
If the fly height is increased to extend head life, then head longevity improves, but data throughput and read operation performance decrease
Solution Approach 1:
The patent employs a feedback control mechanism where performance metrics (throughput, power consumption) are continuously monitored and fed back to the fly height control system. This feedback loop enables the system to determine when performance margin exists and adjust fly height upward to extend head life, while automatically detecting when throughput degradation occurs and reducing fly height to restore optimal performance. The feedback mechanism ensures both head longevity and data throughput requirements are met.
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 allows for increased head longevity while maintaining performance metrics within predetermined ranges, reducing the number of retry reads and power consumption, thereby optimizing the trade-off between data recovery efficiency and head durability.
Implementation Method 1
a head connected to a distal end of an actuator arm which is rotated about a pivot by a voice coil motor (VCM)
Implementation Method 2
the read element, and a fly height actuator configured to control a fly height of the head over the disk
Data Source
AI summary
A data storage device is disclosed comprising a head actuated over a disk, wherein the head comprises a fly height actuator configured to control a fly height of the head over the disk. A plurality of host read commands are received from a host, and a performance metric associated with accessing the disk to execute the host read commands is measured. When the performance metric indicates the data storage device is operating with a performance margin, the fly height actuator is controlled to increase the fly height of the head over the disk, wherein the performance metric consists of at least one of a throughput of the host read commands and a power consumption of the data storage device.