Servo Field Dependent Write Boost for Magnetic Media
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Solution Overview
Problem
Existing data storage devices face challenges in accurately positioning heads over disk surfaces due to adjacent track interference (ATI) during magnetic recording, which affects the fidelity of magnetic transitions and data track density.
Innovation Solution
Implementing a write boost mechanism that adjusts write current parameters such as amplitude and overshoot duration based on the pattern of magnetic transitions being written, allowing for optimized servo sector writing by configuring different settings for servo preamble and burst fields, and using write assist elements like lasers or spin torque oscillators to enhance recording quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If saturation recording is used to write data to the disk, then data can be recorded on the disk surface, but adjacent track interference occurs which degrades the fidelity of magnetic transitions
Solution Approach 1:
The patent applies different write current settings (write boost levels) to different servo fields within the same servo sector. Specifically, the preamble field uses one write current setting while the burst fields use different write current settings. This local differentiation optimizes magnetic transition fidelity in each field while minimizing adjacent track interference, as each field's write parameters are tailored to its specific requirements rather than using a uniform setting across the entire sector.
2Quantity of substance
If higher data track density is implemented, then storage capacity increases, but head positioning precision becomes more difficult to maintain
Solution Approach 1:
The patent dynamically changes write current parameters (amplitude and duration) based on the specific servo field being written. By adjusting the write boost setting according to whether the current field is a preamble or burst field, the system optimizes magnetic transition sharpness and spacing. This parameter optimization enables tighter track spacing (higher density) while maintaining sufficient magnetic transition fidelity for accurate head positioning and servo tracking.
3Ease of manufacture
If uniform write current settings are used for all servo fields, then the writing process is simplified, but the quality of magnetic transitions varies across different servo fields
Solution Approach 1:
The patent implements dynamic write current adjustment where the write boost setting changes based on the servo field type. The system transitions from a static, uniform write current approach to a dynamic approach where preamble fields and burst fields receive different write current settings. This dynamic adaptation optimizes magnetic transition quality for each field type while the overall process remains automated and integrated into the existing servo writing workflow.
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 improves the fidelity of magnetic transitions by reducing adjacent track interference and optimizing data track density, enabling more precise head positioning and enhanced data storage performance.
Implementation Method 1
Data is typically written to the disk by modulating a write current in an inductive coil (write coil) to record magnetic transitions onto the disk surface
Implementation Method 2
Heat assisted magnetic recording (HAMR) is a recent development that improves the quality of written data by heating the disk surface during write operations in order to decrease the coercivity of the magnetic medium
Implementation Method 3
Microwave assisted magnetic recording (MAMR) is also a recent development that improves the quality of written data by using a spin torque oscillator (STO) to apply a high frequency auxiliary magnetic field to the media close to the resonant frequency of the magnetic grains
Data Source
AI summary
A data storage device is disclosed comprising a head actuated over a magnetic media. A write boost is configured to a first setting, and a first pattern of magnetic transitions is written to a first servo field of a servo sector on the magnetic media using the first setting for the write boost. The write boost is configured to a second setting different from the first setting, and the first pattern of magnetic transitions is written to a second servo field of the servo sector on the magnetic media using the second setting for the write boost.