Multi-Reader Head Cross-Track Separation for Areal Density
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current magnetic recording technologies like BPMR and HAMR require costly modifications to media and heads, while TDMR relies on powerful signal processing, necessitating a cost-effective approach to enhance recording density.
Innovation Solution
The implementation of an Array-Reader Based Magnetic Recording (ARMR) system using a multi-reader head with adaptive cross-track separation and skew-dependent signal processing to achieve improved areal density without significant hardware modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Bit Patterned Media Recording (BPMR) or Heat-Assisted Magnetic Recording (HAMR) is used to overcome the super-paramagnetic limit and increase recording density, then recording density is improved, but manufacturing cost significantly increases due to modifications required to media and heads
Solution Approach 1:
The patent changes the operational parameters of the magnetic recording system by implementing array-reader based magnetic recording with multiple readers spaced at specific cross-track separations. This approach achieves higher areal density by utilizing multiple readers to read adjacent tracks simultaneously, thereby overcoming the super-paramagnetic limit without requiring costly modifications to media or head structures like BPMR and HAMR do
Solution Approach 2:
The patent divides the reading function into multiple separate readers within a single head assembly. Instead of using a single reader that would require complex modifications to achieve high density, the system segments the reading function across multiple readers (e.g., first reader, second reader, third reader) with specific cross-track separations, allowing simultaneous reading of multiple tracks and achieving higher areal density without costly hardware modifications
2Productivity
If Two-Dimensional Magnetic Recording (TDMR) with multiple-head configuration is used to achieve high recording density, then recording density is improved, but device complexity increases due to reliance on powerful signal processing
Solution Approach 1:
The patent optimizes the cross-track separation parameter between readers to achieve optimal signal-to-noise ratio and minimize interference. By carefully selecting the cross-track separation distance (e.g., specific track pitch ratios), the system achieves high areal density with reduced signal processing complexity compared to conventional TDMR systems
Solution Approach 2:
The patent uses a specific number of readers (e.g., three readers) with optimized spacing to achieve sufficient areal density improvement without implementing full complex TDMR signal processing. This partial approach provides adequate density enhancement while keeping signal processing requirements manageable
3Productivity
If Array-Reader Based Magnetic Recording (ARMR) with multi-reader head is used to increase areal density, then areal density is improved, but manufacturing complexity increases due to multiple sensor requirements
Solution Approach 1:
The patent merges multiple readers into a single integrated head assembly. Instead of using separate head assemblies that would be complex to manufacture and align, the system combines multiple readers (first reader, second reader, third reader) into one integrated multi-reader head with fixed cross-track separations, simplifying manufacturing while achieving high areal density through simultaneous multi-track reading
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
ARMR achieves significant areal density gains by varying bits and tracks per inch based on predicted cross-track separation and skew angle, enhancing storage density and Signal-to-Noise Ratio without increasing costs.
Implementation Method 1
performing an operation to read data from or write data to a magnetic recording medium
Implementation Method 2
magnetic recording medium
Data Source
AI summary
A method of operating a multi-reader two-dimensional magnetic recording system includes determining a position of a multi-reader head of the multi-reader two-dimensional magnetic recording system, determining an areal density push according to the position of the multi-reader head, and performing an operation to read data from or write data to a magnetic recording medium according to the areal density push.