Magnetic Disk Write Head Field Suppression
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Solution Overview
Problem
Magnetic disk devices face performance deterioration due to increased recording density leading to magnetic field interference with adjacent tracks, especially under external vibrations, which can cause data intrusion and require inhibiting data recording to prevent errors.
Innovation Solution
A magnetic disk device configuration that includes a control section to suppress the magnetic field range of the write head based on offset amounts, using a heater to adjust levitation and current supply to prevent data intrusion, with multiple thresholds for determining when to inhibit or allow data recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the recording density of the magnetic disk is increased to enhance storage capacity, then the storage capacity is improved, but the magnetic field influence on adjacent tracks increases causing data intrusion
Solution Approach 1:
The control section executes preliminary anti-action by detecting offset amounts before data writing and suppressing the magnetic field range of the write head in advance when offset exceeds a threshold. This prevents magnetic field intrusion into adjacent tracks before it can occur, allowing continuous data recording even during vibrations without causing data corruption.
Solution Approach 2:
The patent applies dynamics by making the magnetic field range of the write head adjustable rather than fixed. The control section dynamically suppresses the magnetic field range based on real-time offset detection, enabling the system to adapt to vibration conditions while maintaining recording capability. This dynamic adjustment resolves the contradiction between maintaining high recording density and preventing magnetic field interference.
2Reliability
If data recording is inhibited when offset threshold is exceeded to prevent data intrusion, then data integrity is improved, but data recording performance deteriorates during long-duration vibrations
Solution Approach 1:
The control section performs preliminary anti-action by suppressing the magnetic field range before data writing when offset exceeds the threshold. This preventive measure ensures data integrity is maintained while allowing recording to continue, thus improving reliability without completely halting productivity during vibration events.
Solution Approach 2:
The patent applies parameter changes by modifying the magnetic field range parameter of the write head based on offset conditions. When offset exceeds the threshold, the magnetic field range is suppressed to a smaller value, allowing recording to proceed with reduced field influence. This parameter adjustment maintains data integrity while preserving recording performance during vibrations.
3Object-generated harmful factors
If the magnetic field range of the write head is suppressed to prevent adjacent track intrusion, then data intrusion is prevented, but the offset threshold must be exceeded more frequently under vibration
Solution Approach 1:
The control section implements feedback by continuously detecting the offset amount and comparing it against the threshold, then adjusting the magnetic field range accordingly. This closed-loop feedback mechanism automatically manages the complexity of multiple thresholds, suppressing the magnetic field only when necessary while maintaining simple operation for normal recording conditions.
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
The solution effectively suppresses magnetic field interference, allowing data recording even under vibrations by adjusting the write head's levitation and current, thereby improving data recording performance and preventing data intrusion into adjacent tracks.
Implementation Method 1
a heater that adjusts an amount of levitation of each of the read head and the write head relative to the magnetic disk
Data Source
AI summary
According to one embodiment, a magnetic disk device includes a magnetic disk, a magnetic head, an electric power supply section, a control section, and an address storage section. The control section reads data from the magnetic disk by means of the read head on the basis of the address stored in the address storage section at predetermined timing, and writes the read data to the magnetic disk by means of the write head without suppressing the magnetic field range.