JPS54151810A - Magnetic disk controller - Google Patents

Magnetic disk controller

Info

Publication number
JPS54151810A
JPS54151810A JP6021578A JP6021578A JPS54151810A JP S54151810 A JPS54151810 A JP S54151810A JP 6021578 A JP6021578 A JP 6021578A JP 6021578 A JP6021578 A JP 6021578A JP S54151810 A JPS54151810 A JP S54151810A
Authority
JP
Japan
Prior art keywords
magnetic disk
disk devices
disk controller
shorten
devices
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
JP6021578A
Other languages
Japanese (ja)
Inventor
Kiyohiko Kobayashi
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP6021578A priority Critical patent/JPS54151810A/en
Publication of JPS54151810A publication Critical patent/JPS54151810A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/28—Speed controlling, regulating, or indicating

Landscapes

  • Rotational Drive Of Disk (AREA)

Abstract

PURPOSE:To shorten the reading time by comparing the phases of index signals from plural groups of magnetic disk devices and reference signals so that a drive motor is controlled to synchronously drive the disk devices. CONSTITUTION:The index signals read out of magnetic disk devices 1 and 2, which are driven through motor drive units 7 and 8, are compared in phase with reference signals by the phase comparator circuit 4 of a magnetic disk controller 6 so that the drive units 7 and 8 are controlled to have the same phase through a motor drive unit control circuit 5. Then, the devices 1 and 2 are synchronized in timing and position to rotate. As a result, the track change from one device 1 to the other device 2 is performed reliably at the end of the reading operation of one of the tracks so that the stand-by time is eliminated to shorten the reading time.
JP6021578A 1978-05-20 1978-05-20 Magnetic disk controller Pending JPS54151810A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6021578A JPS54151810A (en) 1978-05-20 1978-05-20 Magnetic disk controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6021578A JPS54151810A (en) 1978-05-20 1978-05-20 Magnetic disk controller

Publications (1)

Publication Number Publication Date
JPS54151810A true JPS54151810A (en) 1979-11-29

Family

ID=13135708

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6021578A Pending JPS54151810A (en) 1978-05-20 1978-05-20 Magnetic disk controller

Country Status (1)

Country Link
JP (1) JPS54151810A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59218671A (en) * 1983-05-10 1984-12-08 Fujitsu Ltd Control system of magnetic disk device
JPH0344881A (en) * 1989-07-12 1991-02-26 Nec Corp Optical disk device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59218671A (en) * 1983-05-10 1984-12-08 Fujitsu Ltd Control system of magnetic disk device
JPH0344881A (en) * 1989-07-12 1991-02-26 Nec Corp Optical disk device

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