Disk pack swap process for evaluating magnetic recording...

Electricity: measuring and testing – Magnetic – Magnetic information storage element testing

Reexamination Certificate

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C324S212000, C360S025000

Reexamination Certificate

active

10928085

ABSTRACT:
A method for testing electromagnetic characteristics of magnetic media while maintaining consistent performance of a read/write head and recording channel is disclosed. The disclosed method is performed such that reduced statistical sampling is achieved. The method includes recording a first set of baseline measurements utilizing a first magnetic media with the read/write head and recording channel. The first magnetic media is then removed from an assembly containing the read/write head and recording channel and is replaced with a second magnetic media. Measurements are made utilizing the second magnetic media with the read/write head and recording channel, wherein the measurements are comparable with the baseline measurements and wherein consistent performance of the read/write head and the recording channel is maintained so as to reduce the size of statistical samples needed.

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“Disk Surface Analysis Technique” IBM Technical Disclosure Bulletin. Feb. 1976; pp. 3032.
C. J Taylor “Disk Pack Testing—A New Approach” Proc. Conf. Video & Data Recording Jul. 10-12, 1973; pp. 189ff.

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