Hard Disk Drive Write Overshoot Current Temperature Compensation
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Solution Overview
Problem
Hard disk drive write systems experience performance degradation due to temperature variations, leading to distorted current pulses and reduced storage capacity and speed, as increased temperature affects parasitic and device parameters, causing slower switching times and amplitude loss in overshoot current pulses.
Innovation Solution
A hard drive write system with a pulse former and signal generator that uses current sources with temperature coefficients to adjust time delays, ensuring a linear delay over temperature ranges, thereby maintaining the duration and amplitude of overshoot current pulses, despite temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the duration of the current pulse is decreased to increase hard drive speed and storage capacity, then the write speed and capacity increase, but the current pulse becomes distorted during transmission
Solution Approach 1:
The patent applies preliminary action by pre-shaping the current pulse with an overshoot portion before transmission. The pulse generator creates a current pulse with an initial overshoot that anticipates the distortion that will occur during transmission, ensuring the leading edge remains sharp despite temperature-induced delays in the write driver system.
2Power
If temperature increases during hard drive operation, then heat is generated from write operations, but device performance degrades due to slower switching times
Solution Approach 1:
The patent applies parameter changes by adjusting the overshoot duration parameter based on temperature. The system includes a temperature sensor that detects hard drive temperature and a controller that modifies the overshoot duration of the current pulse accordingly. At higher temperatures where switching is slower, the overshoot duration is extended to compensate for the delayed switching response.
Solution Approach 2:
The patent implements feedback by using a temperature sensor to continuously monitor the hard drive temperature and feeding this information back to the controller. The controller then adjusts the current pulse overshoot duration in real-time based on the detected temperature, creating a closed-loop system that maintains optimal write performance across varying temperature conditions.
3Manufacturing precision
If the overshoot current pulse amplitude is increased to maintain leading edge sharpness, then the leading edge distortion is reduced, but the amplitude loss due to temperature increases
Solution Approach 1:
The patent applies dynamics by making the overshoot duration variable rather than fixed. The system dynamically adjusts the overshoot duration based on real-time temperature measurements, extending the overshoot at higher temperatures and reducing it at lower temperatures. This dynamic adjustment optimizes the balance between maintaining leading edge sharpness and minimizing energy loss across the operating temperature range.
Data Source
AI summary
Methods and apparatus for temperature compensation for hard disk drive writer overshoot current are disclosed. A disclosed system comprises creating a first delay based on the temperature of the hard disk drive, creating a second delay based on the temperature of the hard disk drive, and creating a pulse based on the first and second delay.