Read-Only Field Access Circuit Noise Filtering

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Solution Overview

Problem

In data storage systems, the simultaneous operation of read and write elements is hindered by a gap between data and servo fields, leading to inefficient data storage due to the inability to enable both elements concurrently, resulting in noise interference that affects data integrity.

Innovation Solution

A circuit configuration that enables simultaneous operation of read and write elements by using a filter to reduce noise, allowing the read element to operate in read-only fields while the write element writes data, thereby reducing or eliminating the gap between data and servo fields and minimizing noise interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the read element and write element operate simultaneously, then data storage efficiency is improved, but noise interference increases affecting data integrity

Engineering Contradiction:

Improvedata storage efficiencyVSAvoidnoise interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

A filter circuit is introduced as an intermediary component between the write element and the read element signal path. The filter receives both the read signal and write signal, and selectively passes the read signal while attenuating the write signal noise, thereby enabling simultaneous operation without data integrity compromise

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The harmful write noise is extracted and removed from the combined signal path using the filter circuit. The filter separates the desired read signal from the interfering write signal, allowing the read element to operate independently despite the write element's simultaneous activity

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If a gap is maintained between data and servo fields, then data integrity is preserved, but storage space is wasted

Engineering Contradiction:

Improvedata integrityVSAvoidstorage space

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The previously harmful write noise, which required the gap for mitigation, is now converted into a manageable signal through the filter circuit. The filter transforms the write signal from a harmful interference into a controllable parameter that can be attenuated, allowing the gap to be eliminated and storage space optimized

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Productivity

If the write element operates over data fields, then data writing capability is improved, but read signal quality deteriorates due to noise

Engineering Contradiction:

Improvedata writing capabilityVSAvoidread signal quality

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The filter circuit serves as a mediator that receives both signals and selectively processes them. It maintains the write signal's full strength for data writing while creating a filtered version for reading that has the write noise attenuated, thus preserving both writing capability and reading quality

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS9318147B1Read read-only fields while writing

Publication Date: 2016.04.19 SEAGATE TECH LLC

AI summary

A circuit may be configured to reduce the amount of space used on a storage device when a transducer having a reader and writer passes from a writable data field to a read-only field by enabling both the reader and writer simultaneously. The circuit can be configured to reduce to a threshold level the noise on a read signal that can occur when the reader is over a read-only field and the writer is over a writable data field, and can ignore the read data when both the writer and reader are enabled simultaneously over a writable data field.