Disk Self-Servo Writing with Seek Speed Set by Head Write Width
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Solution Overview
Problem
The manufacturing cost of disk devices is high due to low yield in the self-servo write step, which involves writing a spiral pattern and a servo pattern on a disk.
Innovation Solution
A method is employed to improve the yield of the self-servo write step by adjusting the seek speed of the head based on the acquired write width of the head, allowing for appropriate setting of the spiral pattern's inclination angle relative to the circumferential direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the seek speed is not adjusted according to write width, then the manufacturing process is simple, but the manufacturing yield is low
Solution Approach 1:
The patent applies dynamics by making the seek speed adjustable based on the head's write width characteristics. Different seek speeds are selected dynamically according to the measured write width, allowing the system to adapt to variations in head performance and thereby improve manufacturing yield in the self-servo write step.
Solution Approach 2:
The patent changes the seek speed parameter based on the write width measurement. By adjusting this critical process parameter according to head characteristics, the system optimizes the spiral pattern writing process to ensure adequate sync marks are captured, directly addressing the yield improvement goal.
2Manufacturing precision
If the spiral pattern inclination angle is not properly set, then the writing process is fast, but the positioning accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by measuring the head's write width before the self-servo write step and pre-determining the appropriate seek speed. This preliminary characterization allows the system to select optimal writing parameters in advance, ensuring positioning accuracy is maintained while avoiding unnecessary trial-and-error adjustments that would consume time.
Data Source
AI summary
According to one embodiment, there is provided a method of manufacturing a disk device. The method includes acquiring information on a write width of a head. The method includes adjusting a seek speed of the head at a time of writing a spiral pattern to a disk according to the acquired write width.