Dual-Write Head Magnetic Disk Device for High-Density Recording
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Solution Overview
Problem
Magnetic disk devices face challenges in maintaining high recording density while ensuring data recording quality, particularly due to the narrowing of track pitches which can deteriorate recording quality.
Innovation Solution
A magnetic disk device employing a dual-write head system where one write head writes data and another overwrite data, using an overwrite correction value to adjust the timing and alignment of data patterns, thereby improving recording quality by maintaining data integrity across high-density tracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If data are written in a disk in a high recording density manner, then recording capacity is improved, but recording quality may deteriorate due to narrower track pitches
Solution Approach 1:
The patent divides the writing process into multiple segments by using multiple write heads (first write head and second write head) that write data with different frequencies sequentially to the same track. This segmentation allows each head to contribute to recording quality while maintaining high density through narrow track pitches.
Solution Approach 2:
The patent applies local quality by using different writing frequencies for different write heads targeting the same track. The first write head writes at a first frequency while the second write head writes at a second frequency, creating localized variations in magnetic domain structure that improve overall recording quality in high-density regions.
2Manufacturing precision
If multiple writers with different writing frequencies are used, then recording quality is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple write heads into a single head assembly that can be positioned and controlled together. The first write head and second write head are integrated in the same head structure, allowing them to operate cooperatively on the same track while sharing common positioning and control mechanisms, thereby reducing overall device complexity.
Solution Approach 2:
The head assembly is designed with multi-functionality, serving as both a positioning unit and a multi-frequency writing unit. The same head structure that positions the write elements also facilitates the differential frequency writing operation, eliminating the need for separate positioning systems for each write head.
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 dual-write head system enhances data recording quality by adjusting overwrite timing and alignment, ensuring accurate data placement and reducing sector error rates, thus improving the credibility and reliability of data storage.
Implementation Method 1
a head including a first write head and a second write head configured to write data to the disk
Implementation Method 2
a read head configured to read data from the disk
Data Source
AI summary
According to one embodiment, a magnetic disk device includes a disk, a head including a first write head and a second write head configured to write data to the disk and a read head configured to read data from the disk, and a controller configured to write write data to a first area of the disk with the first write head and to overwrite the write data written with the first write head in the first area with the second write head.