Magnetic read/write device preventing malfunction due to reversal in polarity

Magnetic read/write device preventing malfunction due to reversal in polarity

Embodiments of the invention provide a magnetic read/write device capable of reading/writing data even when a reversal of the output polarity of the readback signal occurs. In one embodiment, a magnetic read/write device is provided which constantly checks the output polarity based on the polarity o...

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1. Verfasser: ZAITSU HIDEKI
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Sprache:eng
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INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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creator ZAITSU HIDEKI
description Embodiments of the invention provide a magnetic read/write device capable of reading/writing data even when a reversal of the output polarity of the readback signal occurs. In one embodiment, a magnetic read/write device is provided which constantly checks the output polarity based on the polarity of the waveform of a signal obtained as a result of equalizing the waveform of a readback signal of gray code (indicating a cylinder number) in each servo sector by use of a matched filter (MF), or based on the waveform of a readback signal read from areas of a magnetic disk which store a special pattern for detecting the output polarity. When a polarity reversal has occurred, the magnetic read/write device assumes that a read error has occurred and performs processing so as not to perform any track seek or track following operation using decoded positional information. The magnetic read/write device then reverses the polarity of the output signal by use of a polarity reversing unit provided within or on the input side of a read/write channel, and resumes servo and read/write operations.
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In one embodiment, a magnetic read/write device is provided which constantly checks the output polarity based on the polarity of the waveform of a signal obtained as a result of equalizing the waveform of a readback signal of gray code (indicating a cylinder number) in each servo sector by use of a matched filter (MF), or based on the waveform of a readback signal read from areas of a magnetic disk which store a special pattern for detecting the output polarity. When a polarity reversal has occurred, the magnetic read/write device assumes that a read error has occurred and performs processing so as not to perform any track seek or track following operation using decoded positional information. 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subjects INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
title Magnetic read/write device preventing malfunction due to reversal in polarity
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