公开(公告)号：JPH10334435A

公开(公告)日：1998-12-18

申请号：JP12451598

申请日：1998-05-07

Applicant: IBM

Inventor： THOMAS ROBERT ALBRECH ,  ROBERT CARL BARRETT ,  JAMES HOWARD EATON ,  HUTCHINS ROBERT ALLEN ,  GLENN ALAN JACATTA

IPC: G11B5/584 ,  G11B20/10 ,  G11B21/10 ,  G11B27/10 ,  G11B27/30

Abstract: PROBLEM TO BE SOLVED: To superimpose address specifying data information upon previously recorded track following servo information by shifting at least two transitions of a repeat transition couple in the parallel direction to transitions other than this repeat transition couple and including the address specifying information to be superimposed with the shift transitions. SOLUTION: A servo read head 26 is smaller than the width of a servo track 27, and a magnetic tape 20 is moved across a tape head assembly 24 in the horizontal direction. On the occurrence of this movement, a servo pattern of magnetic flux transition is detected by the servo read head 26, where an analog servo read signal is generated, and is changed into a position signal by a signal decoder 36 via a servo signal line 34 and is then sent to a servo control device 40 by a position signal line 38, from which a servo control signal is sent to a servo positioning mechanism of the head assembly 24 by a control line 42. Then, the head assembly 24 including the servo reading head 26 is moved vertically to a center line 30 of the servo track or the servo read head 26 is moved to the middle with respect to the center line 30.