JPS5622267A - Write-in system of servo information - Google Patents

Write-in system of servo information

Info

Publication number
JPS5622267A
JPS5622267A JP9767679A JP9767679A JPS5622267A JP S5622267 A JPS5622267 A JP S5622267A JP 9767679 A JP9767679 A JP 9767679A JP 9767679 A JP9767679 A JP 9767679A JP S5622267 A JPS5622267 A JP S5622267A
Authority
JP
Japan
Prior art keywords
servo
write
disc
servo information
information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP9767679A
Other languages
Japanese (ja)
Inventor
Akio Nimata
Yoshibumi Mizoshita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP9767679A priority Critical patent/JPS5622267A/en
Publication of JPS5622267A publication Critical patent/JPS5622267A/en
Pending legal-status Critical Current

Links

Landscapes

  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)

Abstract

PURPOSE: To simplify the job and to increase the reliability, by writing in the servo information through the use of read/write unit of the magnetic disc unit.
CONSTITUTION: When the servo information XR and the length measuring output XL from the laser length measuring system are compared, the difference is input to the servo motor control circuit 25 of the magnetic disc unit itself through the A/D converter 24 especially provided to control the power amplifier 26, and when the bobbin 9 providing the magnetic head position detecting shaft 13 via the voice coil motor VCM27 is driven, the magnetic head 12 is moved via the carriage 6 and arm 11. Based on the information by the reference clock pulse to each servo band and track, the specified servo information is written in the servo disc 2' from the head 12. When this write-in is finished, and when the shaft 13 is removed from the carriage 6 and the disc enclocsure 1 is removed, it can be used as usual disc unit. Thus, the job can be simplified and the reliability can be increased.
COPYRIGHT: (C)1981,JPO&Japio
JP9767679A 1979-07-31 1979-07-31 Write-in system of servo information Pending JPS5622267A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9767679A JPS5622267A (en) 1979-07-31 1979-07-31 Write-in system of servo information

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9767679A JPS5622267A (en) 1979-07-31 1979-07-31 Write-in system of servo information

Publications (1)

Publication Number Publication Date
JPS5622267A true JPS5622267A (en) 1981-03-02

Family

ID=14198606

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9767679A Pending JPS5622267A (en) 1979-07-31 1979-07-31 Write-in system of servo information

Country Status (1)

Country Link
JP (1) JPS5622267A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4584619A (en) * 1984-02-27 1986-04-22 Pioneer Research, Inc. Programmable servo pattern generator
JPH0211554U (en) * 1988-06-28 1990-01-24
US6057977A (en) * 1997-08-07 2000-05-02 International Business Machines Corporation Compact servo pattern optimized for M-R heads

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51123618A (en) * 1975-04-21 1976-10-28 Hitachi Ltd A magnetic disk memory unit
JPS5374009A (en) * 1976-12-13 1978-07-01 Fujitsu Ltd Servo information writing apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51123618A (en) * 1975-04-21 1976-10-28 Hitachi Ltd A magnetic disk memory unit
JPS5374009A (en) * 1976-12-13 1978-07-01 Fujitsu Ltd Servo information writing apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4584619A (en) * 1984-02-27 1986-04-22 Pioneer Research, Inc. Programmable servo pattern generator
JPH0211554U (en) * 1988-06-28 1990-01-24
US6057977A (en) * 1997-08-07 2000-05-02 International Business Machines Corporation Compact servo pattern optimized for M-R heads
US6760184B1 (en) 1997-08-07 2004-07-06 Hitachi Global Storage Technologies Compact servo pattern optimized for M-R heads

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