JPS5538610A - Magnetic disc unit - Google Patents

Magnetic disc unit

Info

Publication number
JPS5538610A
JPS5538610A JP10879078A JP10879078A JPS5538610A JP S5538610 A JPS5538610 A JP S5538610A JP 10879078 A JP10879078 A JP 10879078A JP 10879078 A JP10879078 A JP 10879078A JP S5538610 A JPS5538610 A JP S5538610A
Authority
JP
Japan
Prior art keywords
register
signal
cylinder
difference
address
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
JP10879078A
Other languages
Japanese (ja)
Inventor
Takayuki Mukuta
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 JP10879078A priority Critical patent/JPS5538610A/en
Publication of JPS5538610A publication Critical patent/JPS5538610A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To shorten overhead time for positioning error corrections by a higher rank unit, by making automatic positioning error corrections by a magnetic disc unit.
CONSTITUTION: When a cylinder address is supplied from a higher rank unit through interface part 1, subtraction circuit 4 compares it with the contents of current cylinder address register 5 and their difference is stored in difference register 6. A positioning mechanism is driven to generate track pulses as the result, thereby causing register 6 to count down one by one. When the contents of register 6 reach zero, seek complete signal 11 is generated. On receiving lst sector signal 13 after the reception of signal 11, read demodulation circuit 9' starts reading demodulation operation. Register 5, stores only with the cylinder part of the format of an address part, makes a decision on whether output 12 of circuit 4 is zero after the storage. If signal 12 is not zero, a difference between the cylinder address and current cylinder is automatically stored in register 6 again, thereby performing positioning operation.
COPYRIGHT: (C)1980,JPO&Japio
JP10879078A 1978-09-04 1978-09-04 Magnetic disc unit Pending JPS5538610A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10879078A JPS5538610A (en) 1978-09-04 1978-09-04 Magnetic disc unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10879078A JPS5538610A (en) 1978-09-04 1978-09-04 Magnetic disc unit

Publications (1)

Publication Number Publication Date
JPS5538610A true JPS5538610A (en) 1980-03-18

Family

ID=14493539

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10879078A Pending JPS5538610A (en) 1978-09-04 1978-09-04 Magnetic disc unit

Country Status (1)

Country Link
JP (1) JPS5538610A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6093685A (en) * 1983-10-27 1985-05-25 Pioneer Electronic Corp Information selecting device of disc player
JPS60182568A (en) * 1984-02-29 1985-09-18 Sony Corp Position controller of information recording and/or reading means
JPS62139178A (en) * 1985-12-12 1987-06-22 Nec Corp Floppy disk device
JPH06215500A (en) * 1981-10-28 1994-08-05 Discovision Assoc Playback apparatus of recorded information

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06215500A (en) * 1981-10-28 1994-08-05 Discovision Assoc Playback apparatus of recorded information
JPS6093685A (en) * 1983-10-27 1985-05-25 Pioneer Electronic Corp Information selecting device of disc player
JPS60182568A (en) * 1984-02-29 1985-09-18 Sony Corp Position controller of information recording and/or reading means
JPS62139178A (en) * 1985-12-12 1987-06-22 Nec Corp Floppy disk device

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