Dual-Channel Preamp Circuit for Concurrent Disk Surface Access
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Solution Overview
Problem
Existing data storage devices face challenges in efficiently and cost-effectively executing manufacturing procedures, such as servo writing and defect scanning, due to the need for concurrent access operations across multiple disk surfaces, which are not optimally addressed by current single-channel designs.
Innovation Solution
Implementing a dual-channel preamp circuit architecture that allows for concurrent access operations during manufacturing, followed by a transition to single-channel operation for the final product, reducing complexity and cost while maintaining servo sector coherence across disk surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single channel preamp circuit is used in the final product, then device complexity and cost are reduced, but manufacturing efficiency decreases due to inability to perform concurrent access operations
Solution Approach 1:
The preamp circuit is designed to dynamically switch between single-channel and dual-channel modes. During manufacturing, the circuit operates in dual-channel mode to enable concurrent access operations on multiple disk surfaces. In the final product, it operates in single-channel mode to reduce complexity and cost. This dynamic reconfiguration allows the same hardware to serve different functional requirements at different stages.
Solution Approach 2:
The preamp circuit is designed with universal functionality to perform both single-channel and dual-channel operations. By incorporating dual-channel capability that can be activated during manufacturing and then deactivated or repurposed in the final product, the circuit serves multiple functions: it enables efficient manufacturing procedures while also functioning as a standard single-channel preamp in the deployed device, thereby reducing overall system complexity and cost.
2Productivity
If dual channel capability is maintained in the final product, then manufacturing efficiency is improved through concurrent access operations, but device complexity and cost increase
Solution Approach 1:
The dual-channel capability is utilized in advance during the manufacturing process to perform concurrent access operations, such as simultaneous servo writing and defect scanning on multiple disk surfaces. This preliminary action accelerates manufacturing procedures. After manufacturing is complete, the dual-channel capability is deactivated or repurposed, and the system operates in single-channel mode for normal data storage operations, thereby avoiding the permanent complexity and cost overhead in the final product.
3Productivity
If concurrent access operations are performed during manufacturing, then productivity is improved, but manufacturing procedure complexity increases
Solution Approach 1:
The preamp circuit is designed to automatically reconfigure between single-channel and dual-channel modes based on operational requirements. During manufacturing, the circuit self-activates dual-channel mode to enable concurrent access operations without requiring external control logic or complex manufacturing procedures. This self-service capability simplifies the manufacturing process by eliminating the need for manual configuration or complex control routines, while still achieving the productivity benefits of concurrent operations.
Data Source
AI summary
A data storage device is disclosed comprising a top head actuated over a top surface of a first disk, a bottom head actuated over a bottom surface of the first disk, a top head actuated over a top surface of a second disk, and a bottom head actuated over a bottom surface of the second disk. A dual channel preamp circuit is coupled to the top and bottom heads of the first and second disks, wherein a selection signal is applied to the dual channel preamp circuit to select between the first disk and the second disk. A concurrent access operation of the top and bottom surface of the selected disk is executed using the dual channel preamp circuit.