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JPS56121161A - Magnetic disc unit - Google Patents

Magnetic disc unit

Info

Publication number
JPS56121161A
JPS56121161A JP2276780A JP2276780A JPS56121161A JP S56121161 A JPS56121161 A JP S56121161A JP 2276780 A JP2276780 A JP 2276780A JP 2276780 A JP2276780 A JP 2276780A JP S56121161 A JPS56121161 A JP S56121161A
Authority
JP
Japan
Prior art keywords
cpu1
physical address
address
access frequency
magnetic disc
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
JP2276780A
Other languages
Japanese (ja)
Inventor
Hidehiko Okada
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 JP2276780A priority Critical patent/JPS56121161A/en
Publication of JPS56121161A publication Critical patent/JPS56121161A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/02—Addressing or allocation; Relocation
    • G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)

Abstract

PURPOSE:To execute the access at a high speed against unequal access number of times, by easily optimizing the assignment of a physical address without changing the existing the service program of the CPU. CONSTITUTION:A correspondence table of the logical address provided by the CPU1 and the physical address on the magnetic disc unit 2 is stored in the conversion table 5 of the unit 2, the table 5 is indexed by the logical address provided by the CPU1, the corresponding physical address is derived by the converting circuit 3, and it is sent to the head control circuit 6. In this case, at every logidal address from the CPU1, the access frequency against it is counted by the counter 4, and the physical address is assigned in order from the logical address whose access frequency is high, which has been derived by the counter 4. And, as for the subsequent operation, the physical address can be assigned against unequal access frequency without changing the service program of the CPU1.
JP2276780A 1980-02-27 1980-02-27 Magnetic disc unit Pending JPS56121161A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2276780A JPS56121161A (en) 1980-02-27 1980-02-27 Magnetic disc unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2276780A JPS56121161A (en) 1980-02-27 1980-02-27 Magnetic disc unit

Publications (1)

Publication Number Publication Date
JPS56121161A true JPS56121161A (en) 1981-09-22

Family

ID=12091817

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2276780A Pending JPS56121161A (en) 1980-02-27 1980-02-27 Magnetic disc unit

Country Status (1)

Country Link
JP (1) JPS56121161A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63271518A (en) * 1987-04-28 1988-11-09 Nec Corp File control system
JPH0239225A (en) * 1988-07-28 1990-02-08 Toshiba Corp Filing system
JPH09198195A (en) * 1996-01-19 1997-07-31 Nec Corp Disk device capable of rearranging data
JPH1195934A (en) * 1997-09-22 1999-04-09 Hitachi Ltd Information processing system control method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63271518A (en) * 1987-04-28 1988-11-09 Nec Corp File control system
JPH0239225A (en) * 1988-07-28 1990-02-08 Toshiba Corp Filing system
JPH09198195A (en) * 1996-01-19 1997-07-31 Nec Corp Disk device capable of rearranging data
JPH1195934A (en) * 1997-09-22 1999-04-09 Hitachi Ltd Information processing system control method

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