Hard Disk Drive Spindle Motor Speed Control for Flaw Scan Testing
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Solution Overview
Problem
As hard disk drives increase in areal density, the time and cost of manufacturing are affected by the increased complexity of scanning for and identifying flaws on magnetic recording media, particularly due to smaller track sizes and higher tolerances for error, which prolongs the flaw scan test process.
Innovation Solution
The method involves operating the spindle motor at a speed greater than the predetermined rated speed during flaw scan tests to reduce the time required for identifying flaws, allowing for faster completion of flaw scan tests and potentially other manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spindle motor operates at the predetermined rated speed during flaw scan tests, then the hard disk drive operates within its designed performance parameters, but the time required to identify flaws increases
Solution Approach 1:
The patent applies parameter changes by operating the spindle motor at a speed greater than the predetermined rated speed during flaw scan tests. This change in operating parameter (motor speed) allows the flaw identification process to complete more quickly while maintaining detection accuracy through adjusted scanning parameters and techniques.
2Quantity of substance
If the track size is reduced to increase areal density, then more data can be stored, but the tolerance for error decreases and scanning complexity increases
Solution Approach 1:
The patent addresses scanning complexity by changing the motor speed parameter during flaw scan tests. By operating at higher speeds with adjusted scanning parameters, the system can handle the increased complexity arising from smaller track sizes while maintaining efficient processing.
3Productivity
If the spindle motor operates at a speed greater than the predetermined rated speed, then the time required for flaw scan tests decreases, but the motor operates outside its rated specifications
Solution Approach 1:
The patent applies preliminary action by conducting flaw scan tests at high speeds before the hard disk drive is finalized. This allows the system to identify and filter out flawed media during manufacturing, ensuring that only quality-assured drives are produced, while the high-speed operation is confined to the testing phase rather than prolonged operational use.
Data Source
AI summary
A method for performing a flaw scan test on a hard disk drive is disclosed. The hard disk drive includes a magnetic recording medium and spindle motor associated with a predetermined rated speed. The method includes writing a test pattern to the magnetic recording medium while operating the spindle motor at a speed greater than the predetermined rated speed. The method also includes reading the test pattern at the greater speed and detecting flaws in response to reading the test pattern.