Disk Drive PES Tracking for Rotational Vibration Mitigation
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Solution Overview
Problem
Hard disk drives (HDDs) face interference from rotational vibrations (RV) induced by internal and external components in information handling systems, leading to errors in reading and writing operations, which conventional methods fail to adequately address by correlating mechanical design parameters with vibrational frequencies.
Innovation Solution
Systems and methods that correlate disk drive position error signals (PES) with mechanical and acoustic vibrational frequencies generated inside and outside the HDD chassis, allowing for the identification of adverse vibrational parameters affecting read/write performance, and modifying operational parameters such as mounting positions and vibration source speeds to improve performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods measure acceleration outputs and IOP to correlate mechanical design parameters with vibrational frequencies, then some correlation can be established, but the measurement precision and reliability of RV performance characterization is insufficient
Solution Approach 1:
The patent replaces conventional mechanical vibration measurement methods with acoustic measurement methods. Acoustic sensors measure sound pressure levels and frequency spectra of vibrational sources, providing a non-contact measurement approach that complements traditional acceleration measurements. This substitution enables more precise characterization of RV performance by capturing acoustic signatures that correlate with mechanical vibrations and their impact on read/write operations.
Solution Approach 2:
The patent introduces position error signals (PES) as an intermediary parameter to bridge the gap between mechanical vibrations and read/write performance. PES measures the displacement of the read/write head from the center of the track, providing direct evidence of vibration impact. By correlating acoustic measurements with PES data, the system establishes a reliable chain of evidence linking vibrational sources to operational errors without requiring direct mechanical contact measurements.
2Reliability
If the system collects PES data and vibrational data concurrently at multiple locations, then the correlation between vibration sources and read/write performance improves, but the device complexity increases
Solution Approach 1:
The patent segments the measurement system into distinct functional components: acoustic sensors positioned at vibration sources, path sensors along transmission routes, and PES measurement from the read/write head. Each segment measures a specific aspect of the vibration chain, allowing the complex relationship between sources and effects to be broken down into manageable measurement points. This segmentation enables systematic data collection that improves correlation accuracy while maintaining organizational clarity.
Solution Approach 2:
The patent employs a multi-functional data collection framework that simultaneously measures acoustic parameters, mechanical vibrations, and positional errors across multiple locations. The same measurement infrastructure serves multiple purposes: characterizing vibration sources, mapping transmission paths, and quantifying impact on read/write operations. This universal approach improves reliability through comprehensive data collection while managing complexity by consolidating measurement functions.
3Reliability
If operational parameters such as mounting positions and vibration source speeds are modified to improve performance, then read/write performance improves, but the ease of operation and system configuration becomes more complex
Solution Approach 1:
The patent introduces dynamic adjustment capabilities that allow the system to adapt mounting positions and vibration source speeds based on real-time PES data and acoustic measurements. Rather than fixed configurations, the system can dynamically optimize parameters to minimize vibration impact during different operational conditions. This dynamic approach improves reliability by continuously adapting to changing conditions while managing complexity through automated adjustment rather than manual reconfiguration.
Solution Approach 2:
The patent implements feedback mechanisms where PES data and acoustic measurements are used to guide adjustments to mounting positions and vibration source speeds. The system monitors read/write performance and vibration characteristics, then automatically adjusts parameters to optimize performance. This feedback loop improves reliability by continuously improving read/write performance while reducing operational complexity by automating the configuration process based on measured performance data.
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
Enhances HDD read/write performance by accurately identifying and mitigating the impact of vibrational interference, providing superior RV failure analysis and operational improvements compared to conventional methods.
Implementation Method 1
one or more vibration sensor components configured to sense at least one of mechanical or acoustic vibrations
Implementation Method 2
sense at least one of mechanical or acoustic vibrations simultaneously with the generation of the PES data
Data Source
AI summary
Systems and methods are provided that may be implemented to provide a mechanical indicator to correlate magnetic disk drive IOP performance with features of mechanical and/or acoustic vibrational frequencies that are generated and captured or sensed outside of the disk drive itself. In one example, disk drive PES data may be collected concurrently with the capture of mechanical and/or acoustic vibrational data at different and progressive locations of vibration source, vibration path and vibration receiver in a disk drive operating environment, e.g., such as for disk drives installed within a server and/or storage chassis enclosure. In such case, PES threshold may be utilized to correlate performance of Drive IOP or drive servo-mechanical performance as a function of measured characteristics of vibration source/s that impart vibration to a disk drive.