Multi-Sensor HDD Power Management via Dynamic Sensor Depowering
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Solution Overview
Problem
Hard disk drive (HDD) systems with multiple read sensors consume more power due to additional analog and digital circuitry required for processing multiple readback signals, making it desirable to implement low power modes that reduce power consumption while maintaining performance.
Innovation Solution
Implementing power management strategies in HDD assemblies that allow for low power modes by deactivating or depowering one or more read sensors, reducing the sampling rate of servo processing signals, and selectively deactivating readpath circuitry to conserve power without compromising track following capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple read sensors are used to read a single recorded track, then signal to noise ratio is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the number of active read sensors based on operational mode. During idle periods, only one read sensor remains active to minimize power consumption, while during active data reading operations, multiple read sensors are activated to improve signal to noise ratio. This dynamic configuration allows the system to optimize between power consumption and measurement precision based on real-time operational requirements.
2Productivity
If additional analog and digital circuitry is added for processing multiple readback signals, then signal processing capability is improved, but device complexity increases
Solution Approach 1:
The read channel processing system is segmented into multiple independent processing paths, each capable of handling signals from individual read sensors. This modular architecture allows the system to activate only the necessary processing circuitry corresponding to the number of active read sensors, thereby managing device complexity while maintaining signal processing capability when multiple sensors are in use.
3Use of energy by moving object
If read sensors are deactivated to reduce power consumption, then power savings are achieved, but track following capability is compromised
Solution Approach 1:
The active read sensor is configured to perform multiple functions simultaneously. During idle mode, a single read sensor handles both track following operations and serves as a standby for potential data reading operations. This multi-functionality ensures that track following capability is maintained while minimizing the number of active sensors to achieve power savings.
Data Source
AI summary
A system and method for power management in a hard disk drive (HDD) assembly incorporating two or more read sensors includes directing a read/write head to follow a track; depowering one or more read sensors and readpath circuits associated with the read sensors; reading an analog readback signal through the first read sensor; processing the signal through an analog front-end to generate an input signal; sampling the input signal through an analog to digital converter at a first frequency to generate a first sampling signal; sampling the input signal through a second analog to digital converter at a second frequency to generate a second sampling signal; and generating a digital output signal from either or both sampling signals at a third sampling frequency through a digital signal processor. The method may additionally comprise adjusting a sampling frequency when power level reaches a threshold.