Magnetic Disk Seek Time Adjustment via Temperature and Voltage
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Solution Overview
Problem
Magnetic disk devices face inefficiencies in write operations due to unoptimized seek times, which are not adequately adjusted for temperature and power supply voltage variations, leading to increased latency and reduced performance.
Innovation Solution
A magnetic disk device with a controller that adjusts seek times based on temperature and power supply voltage, using a seek table to reorder write commands for minimized latency, incorporating a voice coil motor drive circuit and sensors to monitor and correct seek times dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If seek time is fixed without adjustment, then device complexity is reduced, but write operation latency increases due to temperature and voltage variations
Solution Approach 1:
The patent implements dynamic seek time adjustment by making the seek time parameter variable based on detected temperature and power supply voltage conditions. The controller dynamically modifies seek times from a table based on environmental sensors, allowing the system to adapt to changing conditions rather than using a fixed seek time value.
Solution Approach 2:
The system employs feedback mechanisms by using temperature sensors and voltage detection circuits to continuously monitor environmental conditions. The controller receives this feedback information and adjusts seek times accordingly, creating a closed-loop control system that optimizes write operations based on real-time conditions.
2Reliability
If seek time is adjusted for environmental variations, then write operation robustness improves, but device complexity increases due to additional sensors and control logic
Solution Approach 1:
The system performs self-adjustment by automatically detecting environmental conditions and modifying its own seek time parameters without external intervention. The controller uses built-in temperature sensors and voltage detection circuits to autonomously optimize write operations, reducing the need for manual calibration or complex external control systems.
Solution Approach 2:
The patent changes the operational parameters of the magnetic disk device by adjusting seek time values based on detected temperature and voltage conditions. Instead of modifying hardware configuration, the system dynamically alters timing parameters through software control, achieving robustness through parameter adaptation rather than structural complexity.
3Productivity
If command reordering is implemented, then productivity improves through reduced latency, but device complexity increases due to command management overhead
Solution Approach 1:
The system performs preliminary reordering of write commands in the command queue before execution. By analyzing the seek distances of multiple pending commands and rearranging them in an optimized sequence, the system prepares the command execution order in advance to minimize total seek time, improving throughput without requiring complex real-time decision-making during execution.
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 enhances write operation efficiency by reducing latency and improving robustness against environmental variations, resulting in improved IOPS values and reduced retries across varying temperature and power supply voltage conditions.
Implementation Method 1
a voice coil motor which drives movement of the magnetic head relative to the magnetic disk
Data Source
AI summary
A magnetic disk device includes a magnetic disk, a magnetic head, a voice coil motor which drives movement of the magnetic head relative to the magnetic disk, a drive circuit which drives the voice coil motor, a memory in which a seek time for a seek operation is stored in association with a seek distance of the magnetic head, and a controller. The controller changes the seek time stored in the memory in association with the seek distance based on a temperature and a power supply voltage of the drive circuit.