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Optimum Signal Gating for Recording Head Indexed Along a Fine Pitch Spiral

IP.com Disclosure Number: IPCOM000046173D
Original Publication Date: 1983-Jun-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Bajgert, TA: AUTHOR [+2]

Abstract

In a low-cost disk drive, it is desirable to index the recording head with a fine pitch spiral rather than using a more expensive mechanism for actuating the head in a random-access manner. If the pitch of the index spiral is less than the width of the read/write element in the recording head, the recording head can still be used to read substantially concentric tracks recorded on the media.

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Optimum Signal Gating for Recording Head Indexed Along a Fine Pitch Spiral

In a low-cost disk drive, it is desirable to index the recording head with a fine pitch spiral rather than using a more expensive mechanism for actuating the head in a random-access manner. If the pitch of the index spiral is less than the width of the read/write element in the recording head, the recording head can still be used to read substantially concentric tracks recorded on the media.

In Fig. 1, a partial cross-sectional diagram of the recording disk with the read/write (R/W) element of the recording head is shown. The recording disk contains magnetic media 10 and substrate 12 to support the media. As shown in Fig. 1, the read/write element 14 of the recording head has a width corresponding to 4 units of head index distance. In other words, the pitch of the head index spiral is such that four revolutions of the spiral are required to move the head a distance equal to the width of the read/write recording element 14.

Fig. 2 shows the head output as it reads a recorded track as the recording head is indexed along the fine pitch spiral. The read level criteria in Fig. 2 is used to indicate when the head output signal for each track is distinct and may be gated out.

Fig. 3 is a schematic diagram of electronics that might be used in the read/write operation for the configuration of Fig. 1. Preamplifier 16 amplifies the signal from the recording head and applies it to read amplifier 18.

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