Reference Pattern Writing on Bit Patterned Media
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Solution Overview
Problem
In bit patterned recording media, writing reference patterns that are coherent with magnetic islands is challenging due to mechanical tolerances and non-coherence between servo and data islands, affecting data writing and reading accuracy.
Innovation Solution
A write clock is locked onto an initial reference pattern, and subsequent reference patterns are written at the detected phase and frequency, ensuring coherence and accuracy in data storage by using previously written patterns as timing and phase references.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If reference patterns are written on bit patterned media using conventional methods, then the writing process can be completed, but the reference patterns are not precisely coherent with the magnetic islands due to mechanical tolerances
Solution Approach 1:
The system performs preliminary detection of the initial reference pattern's phase and frequency before writing subsequent reference patterns. This preliminary action allows the write clock to be locked onto the detected parameters, ensuring that subsequent patterns are written with precise coherence to the magnetic islands, thereby resolving the contradiction between manufacturing precision and reliability.
2Manufacturing precision
If the write clock is locked onto detected phase and frequency from initial reference pattern, then subsequent reference patterns achieve precise coherence, but the system complexity increases
Solution Approach 1:
The system uses feedback by detecting the phase and frequency of the initial reference pattern and using this information to lock the write clock. This feedback mechanism ensures that subsequent reference patterns are written with precise coherence to the magnetic islands, resolving the contradiction between manufacturing precision and device complexity by implementing a targeted feedback loop only for clock synchronization.
Data Source
AI summary
A given reference pattern is written on bit patterned media that has an initial reference pattern already disposed thereon. A write phase and frequency is detected based on the initial reference pattern and the given reference pattern is written on the bit patterned media at the detected write phase and frequency.