Magnetic Disk RRO Correction Parallel Processing
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Solution Overview
Problem
The existing manufacturing processes for magnetic disk devices face inefficiencies in learning and writing repeatable run-out (RRO) correction information, as they typically execute these processes in separate periods, leading to prolonged time requirements and reduced positioning accuracy.
Innovation Solution
The method involves setting multiple learning positions on the magnetic disk and simultaneously learning and writing RRO correction information using the read and write heads, allowing for parallel processing to shorten the time needed for data correction and improve positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If learning and writing RRO correction information are executed in separate periods, then the processes can be performed sequentially with simple control, but the total time required for manufacturing is prolonged
Solution Approach 1:
The patent combines the learning process and writing process into a single integrated operation. The learning unit learns RRO correction information while the writing unit simultaneously writes correction information to the magnetic disk, merging two previously separate processes into a coordinated parallel execution framework that reduces total manufacturing time
Solution Approach 2:
The system performs preliminary learning of RRO correction information at multiple learning positions before final writing to the magnetic disk. By pre-learning correction data at various radial positions and preparing it in advance, the system enables efficient parallel writing operations without compromising accuracy
2Productivity
If correction information is written at each learning position sequentially, then writing accuracy is maintained, but the manufacturing process becomes time-consuming
Solution Approach 1:
The patent divides the magnetic disk surface into multiple learning positions arranged in the radial direction and processes them in parallel segments. The learning unit acquires correction information at multiple positions simultaneously, and the writing unit writes to corresponding regions in parallel, maintaining precision through segmented parallel processing
Solution Approach 2:
The system performs learning at multiple learning positions that extend beyond the immediate write target area. By learning correction information at positions both inside and outside the write range, the system ensures adequate coverage and maintains positioning accuracy while enabling parallel processing across multiple regions
Data Source
AI summary
According to one embodiment, a method for manufacturing a magnetic disk device includes: moving a magnetic head such that a read head is located on a first learning position among a plurality of learning positions set in a radial direction of a magnetic disk; and learning RRO correction information related to the first learning position using the read head. The method further includes: moving the magnetic head such that the read head is located on a second learning position among the plurality of learning positions; and executing writing of the RRO correction information related to the first learning position using the write head in parallel while learning RRO correction information related to the second learning position using the read head when the read head is located on the second learning position.