Dual Read Head Disk Device Inter-Track Interference Mitigation
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Solution Overview
Problem
Magnetic disk devices face challenges in maintaining data decoding performance when adjacent tracks are close or overlap, as existing technologies struggle to effectively adjust read head arrangements to mitigate inter-track interference and improve bit error rate (BER) characteristics.
Innovation Solution
A magnetic disk device configuration that includes a write head and two read heads, where the system controller dynamically adjusts the positioning and settings of the read heads, switching between them as main and sub read heads to optimize data retrieval by changing their radial positions and internal settings during read retries, thereby improving signal quality and BER performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the track pitch is reduced to increase track density, then the storage capacity increases, but the inter-track interference increases and data decoding performance deteriorates
Solution Approach 1:
The invention divides the reading function into multiple independent read heads (main read head and sub read heads) positioned at different radial locations. Each read head independently reads data from the track, and the signals are combined through signal processing to achieve better decoding performance while maintaining high track density
Solution Approach 2:
The invention combines signals from multiple read heads (main read head and sub read heads) through signal processing techniques. By merging the reading functions of multiple heads and processing their combined output, the system achieves improved signal quality and reduced inter-track interference effects
2Reliability
If the read head arrangement is adjusted to improve data decoding performance, then the bit error rate improves, but the system complexity increases
Solution Approach 1:
The system determines the optimal main read head based on signal quality metrics from preliminary reading operations. This feedback mechanism allows the system to adaptively select the best read head configuration, improving decoding performance while keeping the control logic based on measurable signal characteristics rather than complex predetermined arrangements
Solution Approach 2:
The invention dynamically changes which read head serves as the main read head based on signal quality conditions. Instead of a fixed arrangement, the system can switch between different read heads as the main head depending on the reading situation, adapting to varying track conditions and interference patterns
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 decoding performance by effectively managing inter-track interference, improving bit error rates, and ensuring reliable data retrieval even when tracks are close or overlap, through dynamic read head adjustments and settings changes.
Implementation Method 1
a head including a write head that writes data to the disk and a first read head and a second read head that read data from the disk
Data Source
AI summary
According to one embodiment, a magnetic disk device includes a disk, a head including a write head and a first read head and a second read head, and a controller that disposes the first read head at a first radial position of a first track of the disk in a radial direction to read the first track, changes a main read head which serves as a reference for positioning during a read process from the first read head to the second read head when read retrying the first track, disposes the second read head as the main read head at a second radial position different from the first radial position of the first track in the radial direction to read the first track, and changes an internal setting corresponding to the main read head to read the first track.