Magnetic Disk Write Head Error Detection via Heating Value
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Solution Overview
Problem
Magnetic disk devices face data errors due to incomplete detection of write current patterns, leading to deteriorated write performance and the need for frequent write verification, which reduces data reliability and processing speed.
Innovation Solution
A magnetic disk device that includes a controller to determine write errors by measuring the heating value of the write head, corresponding to changes in the write current, and executes write verification only when a data error is detected, thereby improving data reliability and reducing unnecessary verification processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If write verification is executed each time data is written on the disk, then data reliability is improved, but write performance deteriorates
Solution Approach 1:
The patent changes the parameter of verification frequency from 'every write operation' to 'only when heating value anomaly is detected'. The heating value of the write head serves as a diagnostic parameter to predict potential write errors, enabling conditional verification that maintains reliability while improving write performance by reducing unnecessary verification operations.
2Reliability
If write verification is executed frequently, then data errors are detected early, but processing speed decreases
Solution Approach 1:
The patent performs preliminary detection of the heating value of the write head before executing write verification. By measuring the heating value in advance and comparing it against threshold values, the system can predict potential write errors and only then proceed to verification when necessary. This preliminary action filters out normal operations from verification, maintaining error detection capability while improving processing speed.
3Reliability
If the magnetic disk device performs comprehensive write verification, then data integrity is ensured, but device complexity increases
Solution Approach 1:
The patent introduces the heating value of the write head as an intermediary parameter between the write operation and the verification process. Instead of directly verifying every write operation, the system uses heating value measurement as an intermediate indicator to predict write quality. This intermediary simplifies the verification process by providing a predictive metric that reduces the need for comprehensive verification while maintaining data integrity.
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 data reliability and write performance by ensuring write verification is executed only when necessary, thereby maintaining data integrity and improving processing speed.
Implementation Method 1
determines whether a write error occurs, based on a change in a heating value of the head which corresponds to a change in the write current
Data Source
AI summary
A magnetic disk device includes a disk, a head configured to write data on the disk based on a write current, and a controller configured to determine whether a write error occurs when data is written on the disk, based on a change in a heating value of the head, and upon determining that the write error occurs, read the data written on the disk.