Slider Temperature Sensors for Magnetic Media Contamination Detection
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Solution Overview
Problem
Current methods for testing magnetic media disks during manufacturing, such as low clearance fly tests and inductively-coupled plasma mass spectrometry, are limited by low throughput and inability to accurately detect contamination, leading to potential TD delta failures in hard disk drives.
Innovation Solution
Incorporating temperature sensors, specifically nano thermistor sensors, into sliders to monitor head-media spacing and detect contamination by tracking the number of surface scans before instability, allowing for real-time monitoring and high-accuracy detection of contamination events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional testing methods (low clearance fly tests, ICP-MS) are used to test magnetic media disks, then manufacturing process control is maintained, but throughput is low and contamination detection accuracy is insufficient
Solution Approach 1:
The patent replaces traditional mechanical testing methods (low clearance fly tests) and complex analytical methods (ICP-MS) with a thermal field-based detection system. Temperature sensors mounted on the slider detect thermal signals generated during head-media contact, enabling rapid contamination detection without mechanical wear or complex sample preparation, thus achieving both high throughput and accurate contamination detection
Solution Approach 2:
The patent introduces temperature sensors as an intermediary detection mechanism between the head and media. These sensors detect thermal events (such as lubricant breakdown or contamination) that occur during normal flying operations, providing indirect but accurate contamination detection while maintaining normal drive operations and enabling continuous monitoring at high speed
2Reliability
If traditional testing methods are used, then device complexity is lower, but the ability to detect contamination events and prevent TD delta failures is insufficient
Solution Approach 1:
The patent makes the temperature sensor serve multiple functions: it monitors head-media spacing, detects contamination events, tracks surface scan stability, and prevents TD delta failures. This multi-functionality is achieved within the existing slider structure, adding reliability enhancement without requiring separate dedicated testing systems
Solution Approach 2:
The temperature sensor system uses the normal operating conditions of the head (flying over the media) to generate detectable thermal signals. The system detects contamination and instability events during regular operation without requiring separate test modes or external intervention, enabling continuous self-monitoring and prevention of failures
3Productivity
If temperature sensors are integrated into sliders for real-time monitoring, then contamination detection accuracy and throughput improve, but device complexity increases
Solution Approach 1:
The patent combines the temperature sensor with the existing slider structure, integrating the sensing function into the component that already flies over the media. This merging eliminates the need for separate testing hardware and allows the same structure to perform both data storage/retrieval and contamination detection functions simultaneously
Solution Approach 2:
The patent changes the detection parameter from mechanical measurements or chemical analysis to thermal field measurements. By monitoring temperature changes during normal operation, the system achieves rapid contamination detection without adding complex mechanical or chemical testing apparatus, maintaining simplicity while enabling high-throughput monitoring
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 rapid, high-throughput testing capable of detecting contamination and preventing TD delta failures, thereby improving media interface quality and reducing manufacturing costs by identifying and addressing issues before they lead to HDD failures.
Implementation Method 1
the slider includes a magnetic transducer and a temperature sensor... monitor head-media spacing... by tracking the number of surface scans before instability
Implementation Method 2
detect contamination by tracking the number of surface scans before instability, allowing for real-time monitoring and high-accuracy detection of contamination events
Data Source
AI summary
Systems and methods for testing magnetic media disks during manufacturing using sliders with temperature sensors are provided. One such method involves scanning a surface of a selected disk of a plurality of magnetic media disks using a slider including a magnetic transducer and a temperature sensor, counting a number of the surfaces scanned, determining, during the scanning, whether a threshold crossing event has occurred by determining whether a signal from the temperature sensor signal is not within a preselected range, counting, during the scanning, a number of threshold crossing events, storing, if the number of threshold crossing events is greater than a preselected events limit, the number of surfaces scanned, stopping, if the number of surfaces scanned is greater than a surfaces scanned threshold, the scanning, and returning, if the number of surfaces scanned is less than or equal to the surfaces scanned threshold, to scan a next selected disk.