JPS5451431A - Data copy system between rotary type memory units - Google Patents
Data copy system between rotary type memory unitsInfo
- 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
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
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)
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 |
-
1977
- 1977-09-30 JP JP52116919A patent/JPS586183B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS586183B2 (en) | 1983-02-03 |
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