Certify testing apparatus and certify testing method

Details Certify testing apparatus and certify testing method Certify testing apparatus and certify testing method

2011-01-25

2011-01-25

Tzeng, Fred (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

Reexamination Certificate

active

07876518

ABSTRACT:
An apparatus is provided that can detect error locations in certify testing of a magnetic recording medium without influence from undulation of the substrate or irregularities in film thickness distribution of magnetic film of the magnetic recording medium. Such an apparatus tests playback signals of a magnetic recording medium, the magnetic head53conducts playback of signals which are recorded in the magnetic recording medium. The AGC unit34amplifies the played back signals at a gain rate controlled according to elapsed time after input of a signal originating in an error area of the magnetic recording medium among the played back signals. The CMP unit38compares the slice level and the level of the amplified signals, and discriminates the existence or non-existence of error.

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