Magnetic Storage Channel Characterization Using Internal ADCs
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Solution Overview
Problem
Current data storage systems face challenges in efficiently characterizing magnetic recording channels due to high sampling rates required for accurate characterization, which exceed instrumentation capabilities and result in cumbersome and expensive data collection, especially in multichannel systems where synchronization issues limit processing to short waveform portions.
Innovation Solution
A system with multiple analog inputs, analog-to-digital converters, and a buffer for temporarily storing digital signals, along with a digital processing section for reconstructing data, which allows for efficient capture and processing of readback signals without the need for external equipment, enabling synchronized and oversampled waveform generation and noise analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high sampling rates are used for accurate channel characterization, then measurement precision is improved, but device complexity and cost increase due to requiring external instrumentation
Solution Approach 1:
The system uses its own internal resources (analog-to-digital converters, buffers, and digital processing sections already present in the magnetic storage device) to perform channel characterization. The device characterizes its own channel without requiring external instrumentation, eliminating the need for separate high-speed sampling equipment while maintaining characterization accuracy.
Solution Approach 2:
The existing analog-to-digital converters and digital processing sections that are used for normal data read operations are also utilized for channel characterization. This multi-functional approach allows the same hardware components to serve both data retrieval and channel analysis purposes, reducing overall system complexity.
2Measurement precision
If high sampling rates are used for accurate channel characterization, then measurement precision is improved, but loss of time increases due to cumbersome data collection
Solution Approach 1:
By using the device's own internal converters and processing sections for characterization, the system eliminates the need for external data collection operations. The characterization data is captured and processed automatically within the device during normal operation, significantly reducing the time required compared to external instrumentation methods.
3Measurement precision
If external instrumentation is used for channel characterization, then measurement precision is improved, but device complexity increases due to additional equipment requirements
Solution Approach 1:
The magnetic storage device performs its own channel characterization using internally integrated components. The analog-to-digital converters, buffers, and digital processing sections that are already part of the device are utilized for this purpose, eliminating the need for external instruments and simplifying the overall system configuration.
4Productivity
If multichannel systems are used for parallel data processing, then productivity is improved, but device complexity increases due to synchronization issues
Solution Approach 1:
The system uses feedback from the readback signals to adjust and synchronize the sampling process across multiple channels. By continuously monitoring the actual signal characteristics and using this feedback to correct timing variations, the system maintains synchronization in multichannel operation without requiring complex external synchronization equipment.
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 enables efficient characterization of magnetic recording channels by reducing frequency offsets and allowing for simultaneous storage of large amounts of data across multiple channels, eliminating the need for external instruments and simplifying data collection, thereby improving the accuracy and efficiency of channel analysis.
Implementation Method 1
The magnetic recording transducer then generates a magnetic field, which encodes the data into the magnetic media
Implementation Method 2
Data is read from the media by similarly positioning the magnetic read transducer and then sensing the magnetic field of the magnetic media
Data Source
AI summary
A system in one embodiment includes multiple analog inputs for receiving readback signals, an analog to digital converter coupled to each of the analog inputs for converting the readback signals to digital signals, a buffer coupled to outputs of the analog to digital converters for at least temporarily storing the digital signals, and a digital processing section also coupled to outputs of the analog to digital converters for processing the digital signals for reconstructing data therefrom. A method in one embodiment includes receiving multiple channels of analog readback signals from a magnetic head, converting the analog signals in each channel to digital signals, buffering the digital signals, and outputting the buffered digital signals. A method in another embodiment includes receiving a readback waveform from a magnetic storage device, reducing a frequency offset of the readback waveform, and generating a synchronized, oversampled waveform from the readback waveform.