Sector-Based Writing Configuration for Heat-Assisted Magnetic Recording
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Solution Overview
Problem
Heat-assisted magnetic recording (HAMR) technologies face challenges in achieving optimal triple track bit error rate (BER) due to non-uniformity in track profiles and adjacent track influence, particularly with traditional track-based laser diode current writing methods that compromise BER across sectors with once around (OAR) issues.
Innovation Solution
A sector-based writing configuration (SB-WC) method is introduced, where an optimized writing configuration is determined for each sector of a recording medium, adjusting parameters like laser diode current and magnetic writing current to minimize triple track bit error rate, using a sector-based laser diode current (SB-LDI) writing method that iteratively finds the optimal operating current for each sector to achieve uniform BER.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a track-based laser diode current writing method is used, then the writing process is simple, but the triple track bit error rate increases due to non-uniform track profiles and adjacent track influence
Solution Approach 1:
The patent divides the track into multiple sectors and determines optimized writing configurations for each sector individually. This segmentation allows the system to address non-uniform track profiles and adjacent track influence locally, reducing the triple track bit error rate while maintaining operational simplicity through automated sector-based optimization.
Solution Approach 2:
The patent applies different laser diode current values for different sectors based on their specific track profile characteristics and adjacent track influence. This local quality approach ensures optimal writing conditions for each sector, improving reliability without requiring complex global adjustments.
2Device complexity
If a fixed laser diode current is used for the entire track, then the device complexity is low, but the triple track BER varies across sectors due to once around issues
Solution Approach 1:
The patent implements dynamic adjustment of laser diode current values based on sector-specific characteristics. Instead of using a fixed current for the entire track, the system determines optimized current values for each sector, allowing the writing configuration to adapt to local conditions and achieve uniform triple track BER across all sectors.
Solution Approach 2:
The patent employs feedback mechanisms to determine optimized writing configurations for each sector based on measured track profiles and BER characteristics. This feedback loop allows the system to automatically adjust laser diode current values to achieve uniform performance across all sectors without increasing overall device complexity.
3Ease of manufacture
If traditional track-based writing methods are used, then the manufacturing process is simple, but adjacent track influence degrades data density
Solution Approach 1:
The patent segments the track into sectors and applies sector-specific writing configurations that account for adjacent track influence. This segmentation approach allows the system to optimize data density in each sector independently, improving overall data density while maintaining manufacturing simplicity through automated sector-based processing.
Solution Approach 2:
The patent changes the laser diode current parameter for each sector based on its position and adjacent track characteristics. This parameter change approach enables the system to maximize data density by optimizing writing conditions for each sector, addressing adjacent track influence without complicating the manufacturing process.
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 sector-based approach significantly reduces adjacent track influence and achieves optimal triple track BER, enhancing data density and reducing errors over multiple writes, as illustrated by comparisons with traditional track-based methods.
Implementation Method 1
heat energy is used in conjunction with magnetic fields applied to a magnetic recording media, e.g., a hard disk, to overcome super-paramagnetic effects that limit the areal data density of traditional magnetic media
Implementation Method 2
A HAMR recording head, also known as a HAMR slider, includes optical components that direct, concentrate and transform light energy from an energy source to heat on the recording media
Implementation Method 3
The NFT 206 shapes and transmits the energy to create a small hotspot 208 on a surface 210 of a medium 214
Data Source
AI summary
An apparatus comprises a controller configured to apply a writing configuration (WC) to a heat-assisted magnetic recording head to write data to a recording medium. The recording medium includes a plurality of sectors. The controller is further configured to determine an optimized WC for each of the plurality of sectors and initiate a write operation to one of the plurality of sectors. The write operation is configured to be performed by the head utilizing the optimized WC for the respective sector.