Disk Device Dynamic Current Zero Control
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Solution Overview
Problem
Current disk devices face challenges in maintaining optimal current zero time for improved bit error rate, particularly in adjusting this parameter with sufficient resolution to suit varying data patterns, which affects the reliability of information recorded on magnetic disks.
Innovation Solution
The disk device incorporates a controller that performs current zero control by generating an MPRZ signal, allowing for individual adjustment of current zero time based on data patterns, enabling precise control of write current amplitude to zero, thereby optimizing bit error rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current zero time is fixed, then device complexity is reduced, but bit error rate cannot be optimized for varying data patterns
Solution Approach 1:
The patent implements dynamic current zero time adjustment by detecting data patterns and selectively applying different current zero time periods (first period for transition patterns, second period for non-transition patterns). This dynamic adaptation optimizes bit error rate for varying data patterns while maintaining manageable device complexity through a controller that monitors and adjusts timing based on detected patterns.
Solution Approach 2:
The patent changes the current zero time parameter based on data pattern detection. The controller detects whether a data pattern indicates a transition state and selectively sets the current zero time to either a first period or second period, thereby optimizing recording reliability without requiring complete system redesign.
2Reliability
If current zero time is adjusted with high resolution, then recording reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements parameter changes by selectively applying different current zero time periods (first period and second period) based on detected data patterns. This approach achieves high-resolution optimization of recording reliability by adjusting timing parameters according to specific transition or non-transition patterns without requiring excessively complex control mechanisms.
3Manufacturing precision
If current zero time is extended, then magnetization response accuracy is improved, but productivity decreases
Solution Approach 1:
The patent implements dynamic adjustment of current zero time based on data pattern detection. When transitions are detected, a first current zero time period is applied to ensure accurate magnetization response. When no transitions are detected, a second (shorter) current zero time period is used, thereby maintaining productivity while ensuring precision when needed.
Solution Approach 2:
The patent changes the current zero time parameter selectively based on data pattern analysis. By extending current zero time only when data patterns indicate transitions requiring accurate magnetization response, the system optimizes precision without unnecessarily reducing productivity during non-critical writing operations.
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 allows for the precise adjustment of current zero time according to each data pattern, enhancing the reliability of information recorded on the disk by optimizing bit error rate and ensuring accurate magnetization responses.
Implementation Method 1
The preamplifier causes a write current to flow through the head, and the head records information on the disk according to the write current
Data Source
AI summary
According to an embodiment, there is provided a disk device including a disk, a head, a preamplifier and a controller. The head writes information to the disk according to a write current. The preamplifier causes the write current to flow through the head. The controller is capable of causing the preamplifier to perform current zero control for maintaining an amplitude of the write current at zero, and is capable of changing a time for maintaining the amplitude of the write current at zero according to a pattern of write data.