Read Head Position Estimation via Correlation Processing
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Solution Overview
Problem
The increasing density of information on storage media leads to challenges in determining the location of read/write heads relative to the storage medium, resulting in potential damage due to data unlock conditions where the head may strike a crash stop or loading ramp.
Innovation Solution
The system includes data input processing circuits for read heads, a correlation processing circuit to match data sets, and a radius calculation circuit to estimate the radial location of the read/write head on the storage medium, using a correlation value and rotational rate of the medium to determine the offset and calculate the radial distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple read heads are used to sense data from high-density storage media, then data processing capability is improved, but the complexity of determining head location becomes worse
Solution Approach 1:
The patent introduces correlation processing circuits as intermediary components that receive data streams from multiple read heads and process them to determine head location. These circuits act as mediators between the read heads and the control system, automatically calculating radial and tangential positions through correlation analysis, thereby resolving the complexity of multi-head location determination while maintaining high data processing capability
Solution Approach 2:
The patent replaces mechanical position detection methods with a signal processing approach. Instead of using physical sensors or mechanical encoders to detect head position, the system uses correlation processing of data streams to mathematically determine position, substituting mechanical measurement systems with electronic signal analysis to achieve location determination in high-density storage environments
2Quantity of substance
If read heads are positioned closer together to increase storage density, then storage capacity is improved, but the risk of data unlock and head damage increases
Solution Approach 1:
The patent implements continuous feedback through correlation processing circuits that constantly monitor the data streams from multiple read heads. The circuits calculate correlation values and determine head position in real-time, providing feedback to the control system about the actual position of each head. This continuous position feedback enables the system to detect and respond to data unlock conditions immediately, preventing head damage while operating at high storage densities
Solution Approach 2:
The patent performs preliminary position determination by continuously calculating the radial and tangential positions of read heads before data read operations commence. The correlation processing circuits prepare position information in advance, allowing the control system to verify head positioning and prevent potential collisions with crash stops or loading ramps before they occur, thereby ensuring reliability at high storage densities
Data Source
AI summary
Systems, methods, devices, circuits for data processing, and more particularly to systems and methods for determining a down track distance between two or more read heads on a read/write head assembly.