Disk Device Servo Burst Bit Length Optimization
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Solution Overview
Problem
Current disk devices face challenges in improving data capacity due to limitations in the design of servo burst regions on disk media, particularly in the bit length of servo burst patterns, which affects the accuracy of head positioning and data storage efficiency.
Innovation Solution
The implementation of a disk device with a head that includes two read elements and a disk medium partitioned into zones with varying servo burst region bit lengths, where the inner and outer circumference zones utilize only the N-phase burst pattern, reducing the bit length compared to the middle zone, thereby enhancing data capacity and positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the bit length of servo burst pattern is increased to improve head positioning accuracy, then positioning accuracy is improved, but the data capacity of the disk medium is reduced
Solution Approach 1:
The patent applies local quality by differentiating the servo burst pattern bit length across different radial zones of the disk medium. Specifically, the disk medium is divided into a first radial zone (inner radius to intermediate radius) and a second radial zone (intermediate radius to outer radius), with different bit lengths assigned to each zone. This allows optimization of positioning accuracy in each zone without uniformly sacrificing data capacity across the entire medium.
Solution Approach 2:
The patent segments the disk medium into multiple radial zones with different servo burst pattern configurations. The first zone uses a first bit length while the second zone uses a second bit length, enabling independent optimization of positioning requirements for different radial positions without compromising overall data capacity.
2Quantity of substance
If the servo burst region bit length is reduced to increase data capacity, then data capacity is improved, but head positioning accuracy deteriorates
Solution Approach 1:
The patent implements local quality by assigning different bit lengths to servo burst patterns in different radial zones. The first zone (inner to intermediate radius) is allocated a first bit length optimized for its positioning requirements, while the second zone (intermediate to outer radius) is allocated a second bit length, thereby maximizing data capacity in each zone while maintaining adequate positioning accuracy.
Solution Approach 2:
The disk medium is segmented into distinct radial zones with differentiated servo burst pattern bit lengths. This segmentation enables the system to allocate more bits to zones requiring higher positioning precision and fewer bits to zones where data capacity is prioritized, resolving the contradiction between positioning accuracy and data capacity.
Data Source
AI summary
According to one embodiment, in a disk device, the head includes a first read element and a second read element. The disk medium is partitioned into a plurality of zones. The plurality of zones include a first zone and a second zone. The first zone includes a plurality of tracks on each of which a servo area and a data area are placed, a servo burst region in the servo area from which to detect the amount of off-track of the head from the center of a track, having a first bit length. The second zone includes a plurality of tracks on each of which a servo area and a data area are placed, a servo burst region in the servo area from which to detect the amount of off-track of the head from the center of a track, having a second bit length shorter than the first bit length.