JPS5545132A - Access control system of magnetic disk memory unit - Google Patents

Access control system of magnetic disk memory unit

Info

Publication number
JPS5545132A
JPS5545132A JP11791278A JP11791278A JPS5545132A JP S5545132 A JPS5545132 A JP S5545132A JP 11791278 A JP11791278 A JP 11791278A JP 11791278 A JP11791278 A JP 11791278A JP S5545132 A JPS5545132 A JP S5545132A
Authority
JP
Japan
Prior art keywords
speed
cylinder
head
signal
detection
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
JP11791278A
Other languages
Japanese (ja)
Inventor
Takuji Ogawa
Shinichi Kawada
Haruo Hiramatsu
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 JP11791278A priority Critical patent/JPS5545132A/en
Publication of JPS5545132A publication Critical patent/JPS5545132A/en
Pending legal-status Critical Current

Links

Landscapes

  • Moving Of Head For Track Selection And Changing (AREA)

Abstract

PURPOSE: To prevent a bad influence upon seek operation due to an error between an actual moving speed and detection speed by corresponding to an access speed instruction signal corresponding to the number of cylinders where a head moves.
CONSTITUTION: Substracter 21 subtracts a detection address, from present address register 22, varying sequentially with the movement of a head from the address of a desired cylinder set to desired cylinder register 20, thereby generating a cylinder- number difference signal and head moving direction signal from circuit 21. In accordance with this cylinder-number difference, speed instruction signal generator 25 makes a decision on the moving speed of the head. Counter 26, on the other hand, counts up or down the cylinder-number difference corresponding to a direction where the head moves toward the external circumference or internal circumference of the disk and adder 28 corrects the speed instruction signal outputted by generator 25. Stable and high-precision access can therefore be attained under no bad influence of an error between an actual speed signal and detection speed signal calculated from position detection signals varying in level with directions to the external and internal circumferences of the disk.
COPYRIGHT: (C)1980,JPO&Japio
JP11791278A 1978-09-27 1978-09-27 Access control system of magnetic disk memory unit Pending JPS5545132A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11791278A JPS5545132A (en) 1978-09-27 1978-09-27 Access control system of magnetic disk memory unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11791278A JPS5545132A (en) 1978-09-27 1978-09-27 Access control system of magnetic disk memory unit

Publications (1)

Publication Number Publication Date
JPS5545132A true JPS5545132A (en) 1980-03-29

Family

ID=14723244

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11791278A Pending JPS5545132A (en) 1978-09-27 1978-09-27 Access control system of magnetic disk memory unit

Country Status (1)

Country Link
JP (1) JPS5545132A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57176568A (en) * 1981-04-22 1982-10-29 Pioneer Electronic Corp Relative movement controller between pickup and recording track for information reader
JPS63312412A (en) * 1987-06-12 1988-12-20 Zenitakagumi:Kk Underwater compacting work
JPS63315720A (en) * 1987-06-19 1988-12-23 Daisue Kensetsu Kk Ground compaction method and its device
JPS63200269U (en) * 1987-06-08 1988-12-23
JPH01256078A (en) * 1988-04-06 1989-10-12 Toshiba Corp Magnetic head moving controller for magnetic disk device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5434214A (en) * 1977-08-23 1979-03-13 Fujitsu Ltd Location controlling system of servo head in magnetic disc recorder
JPS599095A (en) * 1982-07-09 1984-01-18 Ricoh Co Ltd Recording material for electrifying transfer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5434214A (en) * 1977-08-23 1979-03-13 Fujitsu Ltd Location controlling system of servo head in magnetic disc recorder
JPS599095A (en) * 1982-07-09 1984-01-18 Ricoh Co Ltd Recording material for electrifying transfer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57176568A (en) * 1981-04-22 1982-10-29 Pioneer Electronic Corp Relative movement controller between pickup and recording track for information reader
JPS63200269U (en) * 1987-06-08 1988-12-23
JPS63312412A (en) * 1987-06-12 1988-12-20 Zenitakagumi:Kk Underwater compacting work
JPS63315720A (en) * 1987-06-19 1988-12-23 Daisue Kensetsu Kk Ground compaction method and its device
JPH01256078A (en) * 1988-04-06 1989-10-12 Toshiba Corp Magnetic head moving controller for magnetic disk device

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