JPS6421773A - Magnetic disk device - Google Patents

Magnetic disk device

Info

Publication number
JPS6421773A
JPS6421773A JP17764387A JP17764387A JPS6421773A JP S6421773 A JPS6421773 A JP S6421773A JP 17764387 A JP17764387 A JP 17764387A JP 17764387 A JP17764387 A JP 17764387A JP S6421773 A JPS6421773 A JP S6421773A
Authority
JP
Japan
Prior art keywords
servo
voltage
amplitude
reference voltage
comparator
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.)
Granted
Application number
JP17764387A
Other languages
Japanese (ja)
Other versions
JPH0668894B2 (en
Inventor
Yoshihisa Okawa
Terumitsu Okamoto
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP17764387A priority Critical patent/JPH0668894B2/en
Priority to EP88111412A priority patent/EP0314879B1/en
Priority to US07/219,545 priority patent/US5053899A/en
Priority to DE3851684T priority patent/DE3851684T2/en
Publication of JPS6421773A publication Critical patent/JPS6421773A/en
Publication of JPH0668894B2 publication Critical patent/JPH0668894B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Moving Of The Head To Find And Align With The Track (AREA)

Abstract

PURPOSE:To shorten a servo area, and to increase the storage capacity of a disk by allowing the reference voltage of a comparator to generate a servo ID detection signal be always a voltage value that the minimum voltage and the maximum voltage of a comparator input voltage are divided by a definite ratio, by using a reference voltage output circuit. CONSTITUTION:The reference voltage output circuit 5 outputs the voltage value that an interval between the minimum voltage and the maximum voltage of a detection output is divided by the some definite ratio. The comparator 6 compares the output of the reference voltage output circuit 5 with the detection output 4', and generates a pulse 6' as the servo ID detection signal. A position error detector 7 detects the amplitude of a reproduced signal 2a', and at the same time, when the pulse of the servo ID detection signal is inputted, the detector 7 reads out the amplitude of the reproduced signal definite time after that, and outputs a position error signal, proportional to the difference of the amplitude of a servo data part. Thus, the servo area, necessitated for exactly detecting the amplitude of the servo data part and correctly controlling the position of the magnetic head, can be shortened, and the storage capacity of the magnetic disk can be increased.
JP17764387A 1987-07-15 1987-07-15 Magnetic disk unit Expired - Fee Related JPH0668894B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP17764387A JPH0668894B2 (en) 1987-07-15 1987-07-15 Magnetic disk unit
EP88111412A EP0314879B1 (en) 1987-07-15 1988-07-15 Control of relative position between a magnetic head and a recording medium
US07/219,545 US5053899A (en) 1987-07-15 1988-07-15 Exact position control of a relative position between a magnetic head and a recording medium
DE3851684T DE3851684T2 (en) 1987-07-15 1988-07-15 Control of the relative position of a magnetic head and a recording medium.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17764387A JPH0668894B2 (en) 1987-07-15 1987-07-15 Magnetic disk unit

Publications (2)

Publication Number Publication Date
JPS6421773A true JPS6421773A (en) 1989-01-25
JPH0668894B2 JPH0668894B2 (en) 1994-08-31

Family

ID=16034578

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17764387A Expired - Fee Related JPH0668894B2 (en) 1987-07-15 1987-07-15 Magnetic disk unit

Country Status (1)

Country Link
JP (1) JPH0668894B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5581418A (en) * 1994-03-15 1996-12-03 Fujitsu Limited Magnetic disk drive unit capable of determining data region position of data region that does not include position identification data

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5581418A (en) * 1994-03-15 1996-12-03 Fujitsu Limited Magnetic disk drive unit capable of determining data region position of data region that does not include position identification data

Also Published As

Publication number Publication date
JPH0668894B2 (en) 1994-08-31

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees