公开(公告)号：JP2002008331A

公开(公告)日：2002-01-11

申请号：JP2001162189

申请日：2001-05-30

Applicant: IBM

Inventor： TIMOTHY JOSEPH CHEINER ,  MARK DEROOMAN SCHULTZ ,  YARMCHUK EDWARD JOHN

IPC: G11B21/08 ,  G11B5/596 ,  G11B21/10

Abstract: PROBLEM TO BE SOLVED: To provide a technique of self-servo writing of servo patterns on a data memory medium. SOLUTION: The initial set of servo pattern tracks is written by moving an actuator so as to strike against a compliant structure (for example, a crash stop) by applying a first force and holding the actuator at a first position for writing the first track of the servo pattern. The actuator is made to arrive at a second position in contact with the compliant structure by changing this force and the second track is written in this position. This process is repeated with respect to the tracks of the structure. The distance (i.e., overlap) between the written tracks is measured by using the reading element of the actuator and this measured distance is compared with the prescribed desired distance. If the measured distance is within a range of assigned allowance, the process is completed.

公开(公告)号：JPH10106195A

公开(公告)日：1998-04-24

申请号：JP17741097

申请日：1997-07-02

Applicant: IBM

Inventor： TIMOTHY CHENER ,  MARK DEROOMAN SCHULTZ ,  BACKNER CHAPMAN WEB ,  EDWARD JOHN YARMCHACK

IPC: G11B5/09 ,  G11B5/55 ,  G11B5/58 ,  G11B5/584 ,  G11B5/596 ,  G11B21/08 ,  G11B21/10

Abstract: PROBLEM TO BE SOLVED: To perform the accurate and timewisely efficient self-servo writing by updating a reference value used for positioning a transporting unit as to a part of track to be written. SOLUTION: A read back signal from a reading control electronic system 28 is supplied to an amplitude demodulating circuit 34 and digitized by an AD coverter 36 then supplied to a division device 40. The reference value 'f' calculated from the sum of a nominal average reference value and an adjusted value suitable for the present track is sent to the division device 40 from the AD converter 36. In the division device 40, this value is divided by the normalized value, and the resulted propagating burst fractional amplitude is supplied to a subtacter 42 to obtain a positional error signal PES. At this time point, a signal is transmitted to a digital servo controller 44 by a microprocessor sequence controller 33 to read out the signal PES, then a new control voltage is set. Thus, the signal PES is adjusted by an actuator 24 to update the reference value to be used for the positioning operation.