JPS5819768A - Rotary type external storage device - Google Patents

Rotary type external storage device

Info

Publication number
JPS5819768A
JPS5819768A JP11895781A JP11895781A JPS5819768A JP S5819768 A JPS5819768 A JP S5819768A JP 11895781 A JP11895781 A JP 11895781A JP 11895781 A JP11895781 A JP 11895781A JP S5819768 A JPS5819768 A JP S5819768A
Authority
JP
Japan
Prior art keywords
signal
index mark
revolution
passes
data
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
JP11895781A
Other languages
Japanese (ja)
Inventor
Hideo Morisue
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 JP11895781A priority Critical patent/JPS5819768A/en
Publication of JPS5819768A publication Critical patent/JPS5819768A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10Indexing; Addressing; Timing or synchronising; Measuring tape travel

Abstract

PURPOSE:To prevent the reduction of the system throughput, by extracting the signal including the data on the time when each rotary storage medium of the 1st and 2nd rotary type storage devices passes a specified position and carrying out the control of revolution based on the output of comparison. CONSTITUTION:The speed of revolution can be electrically controlled for the 1st and 2nd rotary storage devices 26 and 27. Index mark signal of each revolution is delivered from a detector 11 in the form of a signal which includes the data on the time when the rotary storage medium of the 1st device 26 passes on a specified position. While another index mark signal is delivered in the form of a signal including the data on the time when the rotary storage medium of the 2nd device 27 passes a specific position. This latter index mark signal is applied to a comparator 13 as a target signal 14 to be compared with the first index mark signal. Thus the synchronization is possible for the revolving positions between the 1st and 2nd disk devices.
JP11895781A 1981-07-28 1981-07-28 Rotary type external storage device Pending JPS5819768A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11895781A JPS5819768A (en) 1981-07-28 1981-07-28 Rotary type external storage device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11895781A JPS5819768A (en) 1981-07-28 1981-07-28 Rotary type external storage device

Publications (1)

Publication Number Publication Date
JPS5819768A true JPS5819768A (en) 1983-02-04

Family

ID=14749454

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11895781A Pending JPS5819768A (en) 1981-07-28 1981-07-28 Rotary type external storage device

Country Status (1)

Country Link
JP (1) JPS5819768A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63187462A (en) * 1987-01-29 1988-08-03 Fujitsu Ltd Control system for rotary synchronization of magnetic disk device
US5159503A (en) * 1989-06-01 1992-10-27 Hitachi, Ltd. Phase and period synchronization for a slave disk drive

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63187462A (en) * 1987-01-29 1988-08-03 Fujitsu Ltd Control system for rotary synchronization of magnetic disk device
JPH0437500B2 (en) * 1987-01-29 1992-06-19 Fujitsu Ltd
US5159503A (en) * 1989-06-01 1992-10-27 Hitachi, Ltd. Phase and period synchronization for a slave disk drive

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