JPS55134467A - Magnetic disc device - Google Patents

Magnetic disc device

Info

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
Application number
JP4176579A
Other languages
Japanese (ja)
Other versions
JPS6331809B2 (en
Inventor
Akira Sekino
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP4176579A priority Critical patent/JPS55134467A/en
Publication of JPS55134467A publication Critical patent/JPS55134467A/en
Publication of JPS6331809B2 publication Critical patent/JPS6331809B2/ja
Granted legal-status Critical Current

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
JP4176579A 1979-04-06 1979-04-06 Magnetic disc device Granted JPS55134467A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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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