JPS5451431A - Data copy system between rotary type memory units - Google Patents

Data copy system between rotary type memory units

Info

Publication number
JPS5451431A
JPS5451431A JP11691977A JP11691977A JPS5451431A JP S5451431 A JPS5451431 A JP S5451431A JP 11691977 A JP11691977 A JP 11691977A JP 11691977 A JP11691977 A JP 11691977A JP S5451431 A JPS5451431 A JP S5451431A
Authority
JP
Japan
Prior art keywords
revolution
data copy
case
copy
rotary type
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
JP11691977A
Other languages
Japanese (ja)
Other versions
JPS586183B2 (en
Inventor
Seiji Konaka
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP52116919A priority Critical patent/JPS586183B2/en
Publication of JPS5451431A publication Critical patent/JPS5451431A/en
Publication of JPS586183B2 publication Critical patent/JPS586183B2/en
Expired legal-status Critical Current

Links

Abstract

PURPOSE: To complete the data copy in a short time, by using a small capacity of buffer memory.
CONSTITUTION: The buffer memory 26 for one setter's share is provided at least, and when the information copy is made from the disc D1 to D2, only if the diffference of revolution of D1 and D2 is amaller than 1/2 revolution (most suited revolution difference), two tracks are required. But, in case of disc, since the track like this is given as a spare, no problem is taken place. This is artificially inserted between the memory 26 and the rotary unit and data copy is made. Further, the relation between the copy processing time in this case and the phase difference of revolution is as shown in the curve l1 (solid lines), and when the number of sectors per one track is taken as n, the minimum copy processing time is 2+1/n revolution (perfect synchronism) and if the rotary phase difference is less, it can be useful. (The curve l2 shows the case that D2 is delayed from D1 by 1/2 revolution)
COPYRIGHT: (C)1979,JPO&Japio
JP52116919A 1977-09-30 1977-09-30 Data copy method between rotating storage devices Expired JPS586183B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52116919A JPS586183B2 (en) 1977-09-30 1977-09-30 Data copy method between rotating storage devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52116919A JPS586183B2 (en) 1977-09-30 1977-09-30 Data copy method between rotating storage devices

Publications (2)

Publication Number Publication Date
JPS5451431A true JPS5451431A (en) 1979-04-23
JPS586183B2 JPS586183B2 (en) 1983-02-03

Family

ID=14698903

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52116919A Expired JPS586183B2 (en) 1977-09-30 1977-09-30 Data copy method between rotating storage devices

Country Status (1)

Country Link
JP (1) JPS586183B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60113483U (en) * 1984-01-09 1985-07-31 東芝熱器具株式会社 Cold air vent damper device

Also Published As

Publication number Publication date
JPS586183B2 (en) 1983-02-03

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