Disk Track Pitch Layout for Faster Overlap Writing
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Solution Overview
Problem
In disk devices, writing a target track partially overlapping with an adjacent track leads to increased write processing time due to residual vibrations and potential data loss, necessitating a method to speed up write operations while minimizing data erasure.
Innovation Solution
The disk device writes data tracks with a larger pitch on the head side of each band, allowing for reduced waiting times during settling processing by adjusting the off-track slice to accommodate residual vibrations, thereby enabling faster write operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If tracks are written with partial overlap to increase storage density, then storage capacity is improved, but write processing time increases due to residual vibrations and settling requirements
Solution Approach 1:
The system performs preliminary actions by pre-positioning the head to an optimal off-track location before writing begins, and by pre-calculating the asymmetric track pitch distribution. This allows the head to start writing immediately without waiting for full vibration settling, thereby reducing write processing time while maintaining partial track overlap for high storage density
Solution Approach 2:
The patent applies local quality by implementing asymmetric track pitch distribution where the track pitch varies in different radial regions of the disk. Specifically, tracks closer to the head have larger pitch while tracks farther away have smaller pitch, allowing optimized write operations in different zones while maintaining overall high storage capacity through selective overlap in appropriate regions
2Productivity
If waiting time is reduced to speed up write operations, then productivity is improved, but data integrity may be compromised due to residual vibrations
Solution Approach 1:
The system introduces an intermediary mechanism by using asymmetric track pitch distribution as a buffer between the head vibration and the written data. The varying track pitch creates natural spacing that accommodates head displacement during writing, protecting data integrity even when write operations begin before complete vibration settling. This intermediary structure allows reduced waiting time without compromising reliability
Solution Approach 2:
The patent implements beforehand cushioning by pre-designing the asymmetric track pitch layout to anticipate and compensate for residual vibrations during write operations. The larger track pitch near the head position creates a cushioning effect that absorbs the impact of vibrations, allowing the system to reduce waiting time while maintaining data integrity through this pre-established protective structure
Data Source
AI summary
According to one embodiment, a disk device including a head, a disk, and a controller is provided. The disk includes at least one band. When a target track is written while being partially overlapped with a track adjacent to the target track in each of the at least one band, the controller writes a plurality of tracks in the band such that a track pitch on the head side of the band is larger than the other track pitches in at least a part of a circumferential position range.