Virtual Servo Information for Disk Drive Head Positioning
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Solution Overview
Problem
In disk drives using spiral servo information, the head positioning accuracy deteriorates when transitioning from spiral servo tracks to concentric data tracks, leading to reduced random access performance due to misalignment of track centers, which affects the efficiency of positioning control operations.
Innovation Solution
A disk drive system that generates virtual servo information with assumed virtual track centers corresponding to the centers of concentric data tracks, allowing the head to be positioned accurately using this virtual information, thereby correcting the misalignment and improving access efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spiral servo information is used, then servo writing efficiency is improved, but head positioning accuracy deteriorates
Solution Approach 1:
The patent introduces a conversion unit that converts spiral servo information into virtual concentric servo information. This intermediary transformation allows the system to use efficient spiral writing while maintaining accurate positioning for concentric data tracks, effectively resolving the contradiction between writing efficiency and positioning accuracy.
2Loss of time
If spiral servo tracks are used, then servo writing time is reduced, but random access performance deteriorates
Solution Approach 1:
By introducing virtual concentric servo information as an intermediary representation, the system can quickly write spiral servo data while providing accurate positioning references for random access operations. The conversion unit creates virtual concentric track centers from spiral servo sectors, enabling fast servo writing without sacrificing random access performance.
3Productivity
If spiral servo information is used, then servo writing efficiency is improved, but positioning control efficiency deteriorates
Solution Approach 1:
The conversion unit acts as an intermediary that transforms spiral servo information into virtual concentric servo information, making positioning control as efficient as traditional concentric systems. This allows the system to benefit from fast spiral writing while maintaining simple and efficient positioning control operations for concentric data tracks.
Data Source
AI summary
According to one embodiment, in a disk drive using a disk medium storing spiral servo information, a CPU generates virtual servo information having assumed virtual track centers corresponding to centers of concentric data tracks. The CPU performs control to position a head to the center of the concentric data track by using the virtual servo information.