Independent Head Dual Reader Preamplifier for Magnetic Storage
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Solution Overview
Problem
Magnetic recording systems face challenges in simultaneously reading data from multiple read sensors of different heads with high accuracy, particularly due to imperfections in servo pattern writing, leading to performance degradation and limited linear track density.
Innovation Solution
The implementation of an independent head, dual reader mode in magnetic recording systems, where a preamplifier selects and processes read signals from multiple read sensors of different heads using separate read paths and signal processing modules, enabling simultaneous reading and reducing the impact of imperfections in servo pattern writing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple read sensors from different heads are read simultaneously using a single read path, then manufacturing time is reduced and productivity is improved, but measurement precision and reliability deteriorate due to servo pattern writing imperfections
Solution Approach 1:
The patent divides the single read path into multiple independent read paths (first read path and second read path). Each read path independently processes signals from selected read sensors, allowing simultaneous reading from multiple heads while maintaining signal integrity. This segmentation resolves the contradiction by enabling parallel processing without the interference that would occur in a shared path.
Solution Approach 2:
The patent introduces a selector circuit as an intermediary component that receives select signals and routes them to the appropriate read paths. The selector acts as a mediator between the control logic and the read sensors, enabling precise control over which sensors are active on which paths. This intermediary structure allows simultaneous independent processing while maintaining the ability to select specific sensors, thus preserving measurement precision while improving productivity.
2Device complexity
If a single read path is used for multiple read sensors, then device complexity is reduced, but reliability deteriorates due to inability to compensate for servo pattern imperfections
Solution Approach 1:
The read path is segmented into multiple independent paths, each capable of independently processing signals from different read sensors. This segmentation allows the system to select the most reliable path for each sensing event, compensating for servo pattern imperfections by having redundant processing channels. The increased reliability justifies the moderate increase in device complexity.
Solution Approach 2:
The patent enables dynamic selection of read paths based on servo pattern quality and signal characteristics. By monitoring parameters such as signal strength and servo pattern accuracy, the system can switch between different read paths to maintain optimal reliability. This parameter-based selection allows the system to adapt to varying conditions and compensate for imperfections, making the complexity increase worthwhile.
3Measurement precision
If independent head dual reader mode is implemented with separate read paths, then data reading accuracy is improved by compensating for servo imperfections, but device complexity increases
Solution Approach 1:
The preamplifier is segmented into multiple independent read paths with dedicated signal processing capabilities. Each path can independently process signals from specific read sensors, enabling precise control and compensation for servo imperfections. The segmentation allows the system to maintain high measurement precision while keeping each individual path relatively simple, balancing overall complexity.
Solution Approach 2:
The multiple read paths are designed with universal functionality, where each path can process signals from any read sensor in the array. This multi-functionality reduces the need for specialized circuitry for each sensor, thereby controlling device complexity while still providing the independent processing needed for high accuracy. The selector circuit provides the flexibility to route any sensor to any path, maintaining universality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for parallelized reading of multiple magnetic storage surfaces, reducing manufacturing time and improving data retrieval reliability by compensating for servo pattern imperfections, thus enhancing the accuracy and efficiency of data storage and retrieval.
Implementation Method 1
a read sensor to read data from a disc
Data Source
AI summary
An apparatus may include a preamplifier configured to be connected to a plurality of magnetic read/write heads, wherein each of the magnetic read/write heads includes a read sensor to read data from a disc and a write element to write data to the disc. The preamplifier may include a first set of registers configured to indicate a first head of the plurality of magnetic read/write heads that is selected for reading data, a second set of registers configured to indicate a second head of the plurality of magnetic read/write heads that is selected for reading data, an input line configured to receive a control signal to activate reading data from the first head substantially simultaneously with reading data from the second head, a first output to provide data from the first head, and a second output to provide data from the second head.