TDMR Synchronization Signal Generation via Servo Frequency Mixing
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Solution Overview
Problem
Conventional hard disk drives lack a synchronization signal necessary for Two Dimensional Magnetic Recording (TDMR) technology, which requires 2-dimensional channel codes for data recovery and error correction, and existing servo systems do not provide the necessary synchronization during data writing and reading.
Innovation Solution
A method and device that generate a synchronization signal by frequency mixing a readback servo signal from a storage medium with a local signal and filtering the result to provide a synchronization signal for read and write operations, utilizing a frequency mixing circuit and filter to produce a synchronization signal for TDMR technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If TDMR technology is implemented to increase storage capacity, then storage density is improved, but synchronization signal availability deteriorates
Solution Approach 1:
The invention extracts the synchronization signal from the existing servo signal structure. By identifying and separating the synchronization components from the servo signals that are already present on the storage medium, the patent provides the necessary synchronization function without adding separate dedicated synchronization signals, thus maintaining storage capacity while enabling TDMR operation.
Solution Approach 2:
The invention makes the existing servo signal serve dual purposes: continuing to provide servo control functions while simultaneously providing synchronization signals for TDMR. This multi-functionality approach allows the same signal infrastructure to support both traditional servo operations and the new TDMR requirements without additional signal channels.
2Measurement precision
If conventional servo system is used to provide continuous servo control, then head positioning is improved, but synchronization for data operations deteriorates
Solution Approach 1:
The invention introduces a signal processing intermediary that bridges the servo control system and the data operation system. By processing the servo signal through specific circuitry to extract synchronization components, it creates an intermediate representation that can simultaneously satisfy both precise head positioning and data operation synchronization requirements.
3Reliability
If 2-dimensional channel codes are implemented for data recovery, then error correction capability is improved, but signal processing complexity deteriorates
Solution Approach 1:
The invention performs preliminary extraction and preparation of synchronization signals before the main data recovery and error correction processes. By pre-processing the servo signals to isolate synchronization components, it reduces the complexity burden on the subsequent 2-dimensional channel decoding operations, allowing error correction to proceed more efficiently.
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 enables accurate synchronization for read and write operations, improving data recovery and error correction in TDMR by generating a synchronization signal from the readback servo signal, enhancing data storage density and reducing inter-symbol and inter-track interference.
Implementation Method 1
frequency mixing the readback servo signal with a local signal having a local frequency to provide a frequency mixed signal
Implementation Method 2
filtering the frequency mixed signal to provide the synchronization signal for at least one of the read operation or the write operation
Data Source
AI summary
According to embodiments of the present invention, a method for providing a synchronization signal for at least one of a read operation or a write operation carried out by means of a head in a data storage device is provided. The method includes obtaining a readback servo signal from a storage medium of the data storage device by means of the head, the readback servo signal having at least one frequency associated with a servo track of the storage medium, frequency mixing the readback servo signal with a local signal having a local frequency to provide a frequency mixed signal, and filtering the frequency mixed signal to provide the synchronization signal for at least one of the read operation or the write operation. According to further embodiments of the present invention, a data storage device is also provided.