Disk Surface Areal Density Balancing for Storage Quality
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Solution Overview
Problem
Existing data storage devices face challenges in achieving balanced and maximized quality metrics across multiple disk surfaces, particularly in terms of areal density, which affects the off-track read capability and overall recording quality.
Innovation Solution
The implementation of control circuitry that measures quality metrics at discrete areal densities and selects optimal radial and linear densities for each disk surface to ensure the combined areal densities meet a target capacity while maximizing quality metrics, using techniques like interpolation and extrapolation with curve-fitted polynomials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If areal density is increased to meet target capacity, then storage capacity is improved, but recording quality deteriorates
Solution Approach 1:
The patent applies parameter changes by systematically varying areal density parameters (radial and linear density) across multiple disk surfaces and measuring quality metrics at each density level. Control circuitry evaluates these parameters to identify optimal density combinations that achieve target capacity while maintaining recording quality, thereby resolving the contradiction between capacity and quality through quantitative parameter optimization
Solution Approach 2:
The patent implements feedback mechanisms where control circuitry measures quality metrics (such as off-track read capability) at different areal densities and uses this feedback to guide the selection of optimal density parameters. This iterative feedback process ensures that capacity targets are met without compromising recording quality, as the system continuously adjusts and selects parameters based on measured performance
2Quantity of substance
If different areal densities are used across disk surfaces to meet target capacity, then storage capacity is improved, but quality metric balance deteriorates
Solution Approach 1:
The patent applies local quality by allowing different areal density configurations for different disk surfaces while maintaining overall quality balance. Each disk surface can be optimized locally for its specific capacity contribution, but the control circuitry ensures that quality metrics remain balanced across all surfaces. This enables capacity optimization without sacrificing quality uniformity
Solution Approach 2:
The patent implements dynamics by making areal density configurations adaptable rather than fixed. The control circuitry dynamically selects and adjusts density parameters based on measured quality metrics and capacity requirements, allowing the system to optimize the balance between capacity and quality balance in real-time rather than relying on static density assignments
Data Source
AI summary
A data storage device is disclosed comprising a plurality of disk surfaces, and a head actuated over each disk surface. For each disk surface, a quality metric is measured at a plurality of discrete areal densities including a first areal density comprising a first radial density and a first linear density, and a second areal density comprising a second radial density different from the first radial density and a second linear density different from the first linear density. Based on a target capacity, an areal density is selected for each disk surface such that the combined areal densities satisfies the target capacity and such that the quality metrics across the disk surfaces are substantially equal and substantially maximized.