Protective Magnetic Pattern for Thermal Stability in Perpendicular Recording

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing data storage devices face challenges in protecting information from distortion due to limitations in magnetization characteristics, particularly as recording density increases, leading to thermal instability and potential loss of magnetic pattern direction.

Innovation Solution

The method involves forming a protective magnetic pattern with a 180° phase difference adjacent to the primary magnetic pattern on a recording medium, using perpendicular magnetic recording, and selectively forming this pattern for high-frequency or operation-related data to create a protected area that prevents further information storage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If recording density is increased to improve storage capacity, then productivity is improved, but thermal stability deteriorates leading to magnetic pattern distortion

Engineering Contradiction:

Improvestorage capacityVSAvoidthermal stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

A protective magnetic pattern is pre-formed adjacent to the primary magnetic pattern before data writing operations. This protective pattern acts as a buffer that prevents thermal distortion from affecting the primary data pattern, allowing higher recording densities to be maintained with improved thermal stability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The protective magnetic pattern serves as an intermediary element between adjacent data patterns. It absorbs thermal fluctuations and prevents them from propagating to neighboring patterns, thereby maintaining data integrity at high recording densities without sacrificing storage capacity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If protective magnetic pattern is formed adjacent to primary pattern, then reliability is improved through distortion prevention, but device complexity increases

Engineering Contradiction:

Improvedata protectionVSAvoidmagnetic pattern structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The magnetic recording structure is segmented into distinct functional zones: primary data patterns and protective patterns. This segmentation allows the protective function to be isolated to specific adjacent regions rather than requiring complex modifications throughout the entire recording medium, thereby limiting the increase in device complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Protective magnetic patterns are formed only in specific local regions adjacent to primary patterns where protection is needed, rather than uniformly across the entire recording surface. This localized approach provides data protection while minimizing the overall complexity increase of the magnetic pattern structure.

Inventive Principle:

Principle #3Local quality

3Reliability

If protective magnetic pattern is formed for all data, then reliability is improved, but loss of substance increases due to reduced usable storage area

Engineering Contradiction:

Improvedata protectionVSAvoidusable storage area

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

Protective magnetic patterns are formed only for specific portions of data that require protection, such as critical system files or high-priority data, rather than uniformly for all data. This partial application provides necessary protection while minimizing the loss of usable storage area by avoiding redundant protective patterns for less critical data.

Inventive Principle:

Principle #16Partial or excessive action

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 enhances data protection by minimizing distortion and maintaining thermal stability, ensuring that critical information remains intact even at high recording densities, and allows for effective management of protected areas to prevent accidental data overwrite.

Implementation Method 1

The first magnetic pattern and the protective magnetic pattern may be formed on the recording medium by perpendicular magnetic recording.

Methodology Applied

Scientific EffectPerpendicular magnetic recording: Magnetic Field

Implementation Method 2

Methodology Applied

Scientific EffectThermal stability: Thermal Radiation

Data Source

PatentUS8711503B2Protecting information written to recording medium

Publication Date: 2014.04.29 SEAGATE TECH INT

AI summary

A method of protecting information written to a recording medium includes magnetizing the recording medium to form a first magnetic pattern corresponding to information to be stored, and magnetizing the recording medium to form a protective magnetic pattern having a phase difference of 180° from the first magnetic pattern at a position adjacent to where the first magnetic pattern is formed, with adjacent bits of the first magnetic pattern opposite and the protective magnetic pattern opposite to each other.