Storage Device Spiral Number Correction Mechanism
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Solution Overview
Problem
Conventional storage devices experience discrepancies in spiral number detection due to missed interrupts during the detection of spiral servo patterns, leading to positioning control errors in recording/reproducing heads.
Innovation Solution
A storage device with a detector for seed and spiral patterns, a counter for modulo counter number, a generator for incrementing spiral numbers, and a corrector that calculates an ideal spiral number based on multiplied values and radial direction reference numbers to correct discrepancies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If interrupt-driven detection of spiral patterns is used, then detection speed is improved, but reliability deteriorates due to missed interrupts causing spiral number discrepancies
Solution Approach 1:
The patent implements a feedback mechanism where the calculated ideal spiral number is compared with the generated spiral number, and when a discrepancy is detected, the generated spiral number is corrected to match the ideal value. This feedback loop ensures reliability while maintaining interrupt-driven detection speed.
Solution Approach 2:
The patent introduces an intermediary calculation method that computes the ideal spiral number based on the number of seed patterns and spiral patterns detected, rather than relying solely on interrupt counters. This intermediary calculation serves as a verification and correction mechanism for the interrupt-driven detection.
2Productivity
If interrupt-driven counting is used for spiral patterns, then productivity is improved, but measurement precision deteriorates due to skipped interrupts
Solution Approach 1:
The system continuously monitors the relationship between detected seed patterns, spiral patterns, and the generated spiral number through feedback comparison. When the calculated ideal spiral number differs from the interrupt-generated spiral number, the system corrects the value to maintain measurement precision while preserving interrupt-driven productivity.
Solution Approach 2:
The patent performs preliminary detection and counting of seed patterns before spiral pattern detection, using this preliminary information to calculate the ideal spiral number in advance. This preliminary action enables verification and correction of the interrupt-driven spiral number generation.
Data Source
AI summary
An information correcting method includes: detecting a first pattern in a radial direction and a second pattern formed obliquely to the radial direction on a track traversing the first and second patterns; counting number of the first pattern until the count value reaches number of the first pattern in one round of the track; generating a value incremented up number of the second pattern in the one round every time an interrupt associated with detection of the second pattern is generated as number of the second pattern; calculating an ideal number from a value obtained by multiplying the number of the second pattern until the number is counted by the counted number of the detected first pattern and a number set to the second pattern with reference to the second pattern formed at a present initial position; and correcting the generated number with the ideal number.