RRO Address Mark Validation via Energy and Bit Count Metrics

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Solution Overview

Problem

In magnetic recording systems, errors in the detected AC erase pattern can cause improper detection of the RRO address mark due to noise, leading to incorrect identification.

Innovation Solution

A validation metric is used to evaluate the energy of the remaining RRO data bits in the servo sector relative to a predefined threshold, and the number of RRO data bits is compared to an expected value to validate the detected RRO address mark, ensuring accurate detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the AC erase pattern is written in the RRO data field, then the servo sector can be properly formatted, but errors in the detected AC erase pattern due to noise can cause improper detection of the RRO address mark

Engineering Contradiction:

ImproveRRO address mark detection accuracyVSAvoidnoise-induced detection errors

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by validating the detected RRO address mark against expected characteristics before using it for head positioning. The validation metric checks whether the detected pattern conforms to the expected RRO address mark structure, and only if validation passes is the mark used for positioning. This prevents noise-induced errors from compromising positioning accuracy.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback by introducing a validation metric that provides feedback on the quality of the detected RRO address mark. The validation metric compares the detected pattern against expected characteristics and returns a validation result that feeds back into the positioning decision process, allowing the system to reject invalid detections and maintain positioning reliability.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If validation metrics are introduced to verify RRO address marks, then detection accuracy is improved, but device complexity increases

Engineering Contradiction:

ImproveRRO address mark detection precisionVSAvoidvalidation mechanism complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by using the validation metric to evaluate specific parameters of the detected RRO address mark, such as energy levels and pattern characteristics. By changing the evaluation parameters to match expected RRO address mark properties, the system can efficiently validate detections without requiring complex validation mechanisms, thus improving precision while limiting complexity increase.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8699160B2Methods and apparatus for validating detection of RRO address marks

Publication Date: 2014.04.15 AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE LTD

AI summary

Methods and apparatus are provided for validating a detection of RRO address marks. After a potential RRO address mark is detected, a disclosed RROAM validation metric evaluates the energy of the remaining RRO data bits in the servo sector, relative to a predefined energy threshold. In addition, the number of remaining RRO data bits in the servo sector is compared to an expected value. The detected RRO address mark is validated in an exemplary embodiment if the RROAM validation metric satisfies the predefined energy threshold and the proper number of remaining RRO data bits is detected in the servo sector. The potential RRO address mark can optionally be discarded if the potential RRO address mark is not validated.