Multi-Sensor Transducer Concurrent Media Defect Scan
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Solution Overview
Problem
Current data storage devices face challenges in efficiently detecting media defects across multiple tracks during high-density data storage, particularly in multi-sensor transducer environments, where concurrent data recovery and defect detection are necessary to ensure data integrity and storage capacity.
Innovation Solution
A multi-sensor transducer system with at least one write element and multiple read sensors is used to write and sense patterns on adjacent tracks, allowing for concurrent detection of media defects by analyzing variations in readback signals, with parametric adjustments such as increased writer power and fly height adjustments during the scanning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple read sensors are used to detect defects on multiple tracks concurrently, then defect detection efficiency is improved, but device complexity increases
Solution Approach 1:
The transducer is segmented into multiple independent read sensors (first read sensor, second read sensor, etc.), each responsible for detecting defects on specific tracks. This segmentation allows concurrent defect detection across multiple tracks while maintaining modular architecture that manages complexity.
Solution Approach 2:
Each read sensor in the multi-sensor transducer is designed with universal functionality to detect defects on any track it is assigned to monitor. The sensors can concurrently perform defect detection on multiple tracks simultaneously, maximizing their utility and reducing the need for additional specialized components.
2Manufacturing precision
If write power is increased to enhance pattern writing quality, then manufacturing precision is improved, but energy consumption increases
Solution Approach 1:
The write element power is dynamically adjusted based on the specific requirements of each track being written. Rather than using constant high power across all tracks, the system optimizes power delivery in real-time, increasing power only when and where needed to achieve acceptable pattern writing quality, thereby reducing overall energy consumption.
3Measurement precision
If fly height is adjusted to optimize read sensor performance, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The fly height parameter is optimized for each read sensor to achieve the best readback signal quality. By adjusting this critical parameter during the defect scan process, the system enhances measurement precision without requiring complex real-time control mechanisms, as the optimization is performed during the scanning operation rather than during normal data access.
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 enables effective identification of media defects, creating a defect map to avoid storing data in defective sectors, thereby enhancing data storage reliability and capacity in high-density environments.
Implementation Method 1
A first pattern is written to a first track on a rotatable storage media and a second pattern is written to a second track on the media
Implementation Method 2
A first read sensor of a multi-sensor transducer senses the first pattern from the first track and a second read sensor of the multi-sensor transducer concurrently senses the second pattern from the second track
Data Source
AI summary
Apparatus and method for detecting media defects using a multi-sensor transducer. In some embodiments, a first pattern is written to a first track on a rotatable storage media and a second pattern is written to a second track on the media. A first read sensor of a multi-sensor transducer senses the first pattern from the first track and a second read sensor of the multi-sensor transducer concurrently senses the second pattern from the second track. At least one storage media defect is detected responsive to the sensed first and second patterns.