Unified Time Base for Disk Drive Self-Servo-Write Jitter Reduction
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Solution Overview
Problem
In magnetic recording, self-servo-write operations in disk drives face quality issues due to separate time base generators used for spiral data and servo wedge data processing, leading to jitter and affecting the precision of servo wedge data.
Innovation Solution
A unified time base frequency signal is generated for both spiral detection and servo write operations, with sampling and decimation techniques to derive lower frequencies for spiral data, reducing jitter and improving servo wedge data quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If separate time base generators are used for spiral data and servo wedge data processing, then device complexity is reduced, but measurement precision and manufacturing precision deteriorate due to jitter
Solution Approach 1:
The patent merges separate time base generators into a single unified time base generator that serves both spiral data processing and servo wedge data processing. This consolidation eliminates jitter caused by separate generators while maintaining device functionality, directly resolving the contradiction between device complexity and measurement precision.
2Ease of manufacture
If separate time base generators are used for spiral data and servo wedge data processing, then ease of manufacture is improved, but manufacturing precision deteriorates
Solution Approach 1:
The unified time base generator combines the functions of previously separate generators, simplifying the manufacturing process by reducing the number of components while simultaneously improving servo wedge data quality by eliminating jitter. This single generator is designed to handle both spiral and servo wedge operations with high precision.
3Measurement precision
If a unified time base is used for both spiral detection and servo write operations, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The unified time base generator is designed as a multi-functional device that performs both spiral detection and servo write operations. By making the time base generator universal, the patent improves measurement precision for both functions while avoiding the need for separate specialized generators, thus managing device complexity effectively.
4Manufacturing precision
If a unified time base is used for both spiral detection and servo write operations, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent consolidates multiple time base generation functions into a single unified generator, improving manufacturing precision by eliminating jitter while managing complexity through integrated design. The unified generator handles both spiral and servo operations with enhanced precision without requiring multiple separate components.
Data Source
AI summary
Storage device self-servo-write includes generating a time base frequency signal, generating a sampled frequency signal by sampling the time base frequency signal at a sample rate to obtain a first set of samples, decimating those samples at a decimation rate to obtain a second set of samples at a spiral frequency of which the time base frequency is a first integer multiple, detecting a spiral track based on the spiral frequency, and writing a servo pattern based on the spiral track and the time base frequency. A generated sampled frequency obtained by sampling the time base frequency signal at the sample rate is used as the servo write frequency, of which the time base frequency is a second integer multiple. Alternatively, the time base frequency is multiplied by a first rational multiple so that the time base frequency is a second rational multiple of the servo write frequency.