Browse Prior Art Database

Magnetic Tape Recording System

IP.com Disclosure Number: IPCOM000082699D
Original Publication Date: 1975-Jan-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Hagopian, JJ: AUTHOR

Abstract

A magnetic tape apparatus employs a rotary head 10 that scans data tracks 12 longitudinally along the tape 14. To access a selected track, the tape 14 is moved laterally relative to the head 10, which provides an air bearing for the tape. The head assembly includes read, write and erase elements, that are disposed at a zero or home Position.

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Magnetic Tape Recording System

A magnetic tape apparatus employs a rotary head 10 that scans data tracks 12 longitudinally along the tape 14. To access a selected track, the tape 14 is moved laterally relative to the head 10, which provides an air bearing for the tape. The head assembly includes read, write and erase elements, that are disposed at a zero or home Position.

The tape 14 has a servo reference signal prerecorded longitudinally, preferably along a center track. Initially, a servo system acts to align the tape and the prerecorded servo track coarsely with the rotary head 10 at the home position. This servo system includes servo sector sensors 11 and 13 for the 180 degree and zero positions, respectively. Each sensor provides an input to a respective channel which has a gate i5, average and hold circuit 17, amplifier 19 and an actuator 21 for moving the tape into alignment with the head 10.

To achieve a fine position alignment on a selected track, servo signals that are recorded in sectors of the tape 14 before and following data sections provide control signals that center the tape precisely. In addition, automatic track deskewing is realized with these servo signals.

The track accessing servo includes a precision linear position encoder 16 and a register 18. The encoder provides a digital input to the register to accomplish the following:

1. Upon detection of the home or zero position of the tape 14 after threading, as indicated by a zero signal detect...