JPS55134467A - Magnetic disc device - Google Patents
Magnetic disc deviceInfo
- Publication number
- JPS55134467A JPS55134467A JP4176579A JP4176579A JPS55134467A JP S55134467 A JPS55134467 A JP S55134467A JP 4176579 A JP4176579 A JP 4176579A JP 4176579 A JP4176579 A JP 4176579A JP S55134467 A JPS55134467 A JP S55134467A
- Authority
- JP
- Japan
- Prior art keywords
- memory
- register
- given
- read
- addresses
- 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
Landscapes
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
Abstract
PURPOSE: To make change work needless in the program side for re-allocation of a data file, by performing address conversion for every cylinder address and by providing a mechanism, which holds total access frequency, in a unit.
CONSTITUTION: When logical cylinder addresses 11W14 are given to address register 100 and read signal 102 is given to control memory 110, memory contents designated by register 100 are read from memory 110 into data register 120. Logical 1 is added to total access frequencies 125W128 of physical cylinders out of the memory contents by adder 150, and they are stored in data register 101. Here, when partial write signal 104 is given to memory 110, partial write to the memory position of memory 110 designated by contents of register 100 is performed. Next, in case of reallocation of a data file, addresses 11W14 are given to register 100, and physical cylinder addresses 121W124 read from memory 110 are stored in register 101 through inputs 21 to 24, and simultaneously, a partial write signal is given to memory 110.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4176579A JPS55134467A (en) | 1979-04-06 | 1979-04-06 | Magnetic disc device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4176579A JPS55134467A (en) | 1979-04-06 | 1979-04-06 | Magnetic disc device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55134467A true JPS55134467A (en) | 1980-10-20 |
JPS6331809B2 JPS6331809B2 (en) | 1988-06-27 |
Family
ID=12617490
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4176579A Granted JPS55134467A (en) | 1979-04-06 | 1979-04-06 | Magnetic disc device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55134467A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59104778A (en) * | 1982-12-07 | 1984-06-16 | Toshiba Corp | Picture information storing and retrieving device |
JPS59207063A (en) * | 1983-05-06 | 1984-11-24 | Matsushita Electric Ind Co Ltd | Automatic disc replacing device |
JPS6040561A (en) * | 1983-08-12 | 1985-03-02 | Pioneer Electronic Corp | Disk player |
JPS63271518A (en) * | 1987-04-28 | 1988-11-09 | Nec Corp | File control system |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5011742A (en) * | 1973-05-29 | 1975-02-06 | ||
JPS5434727A (en) * | 1977-08-24 | 1979-03-14 | Toshiba Corp | Memory unit |
-
1979
- 1979-04-06 JP JP4176579A patent/JPS55134467A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5011742A (en) * | 1973-05-29 | 1975-02-06 | ||
JPS5434727A (en) * | 1977-08-24 | 1979-03-14 | Toshiba Corp | Memory unit |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59104778A (en) * | 1982-12-07 | 1984-06-16 | Toshiba Corp | Picture information storing and retrieving device |
JPS59207063A (en) * | 1983-05-06 | 1984-11-24 | Matsushita Electric Ind Co Ltd | Automatic disc replacing device |
JPS6040561A (en) * | 1983-08-12 | 1985-03-02 | Pioneer Electronic Corp | Disk player |
JPS63271518A (en) * | 1987-04-28 | 1988-11-09 | Nec Corp | File control system |
Also Published As
Publication number | Publication date |
---|---|
JPS6331809B2 (en) | 1988-06-27 |
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