Dual Servo Address Marks for Higher-Efficiency Disk Servo Sectors
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Solution Overview
Problem
Existing data storage devices face inefficiencies due to the need to switch between write and read elements during data write operations, leading to wasted segments and reduced format efficiency, as the head switches to read servo sectors for positioning information, causing an unwritten segment.
Innovation Solution
Implementing servo sectors with multiple servo address marks (SAMs) that allow selective switching between different SAMs based on operating modes, using a second SAM for track follow modes to enable delayed servo gates, thereby reducing the read-write separation and optimizing format efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the head switches between write and read elements during data write operations to read servo sectors for positioning information, then positioning accuracy is maintained, but format efficiency deteriorates due to unwritten segments
Solution Approach 1:
The patent applies preliminary action by pre-positioning the read element ahead of the write element during data write operations. The read element reads the servo sector before the write element completes its write operation, eliminating the need for switching and preventing unwritten segments. This advance reading action allows the system to maintain positioning accuracy while improving format efficiency.
Solution Approach 2:
The patent implements dynamics by making the read-write separation adjustable rather than fixed. The system dynamically adjusts the separation distance between read and write elements based on operating conditions, allowing optimization of both positioning accuracy and format efficiency under different scenarios.
2Device complexity
If a single servo address mark is used for synchronization, then the servo sector structure is simple, but adaptability to different servo operating modes is limited
Solution Approach 1:
The patent applies universality by incorporating multiple servo address marks within a single servo sector structure. These multiple marks serve different functions for different servo operating modes (e.g., track follow mode vs. seek mode), allowing the same servo sector to adapt to various operations without requiring structural changes or separate sectors for each mode.
Solution Approach 2:
The system dynamically selects which servo address mark to use based on the current servo operating mode. The control circuitry determines the appropriate mark (first or second) depending on whether the operation requires track follow precision or coarse positioning, enabling flexible adaptation to different operational requirements.
Data Source
AI summary
Example storage medium servo patterns, data storage devices, and methods to provide servo tracks with multiple servo synchronization or servo address marks per servo sector in a data storage device are described. The data storage device may include storage media, such as magnetic disks, having servo sectors that define servo tracks, where each servo sector has a first servo address mark before the track identifier and a second servo address mark following the track identifier. Which servo address mark is used for processing the servo sector is based on the current servo operating mode, such as write operations versus seek operations.