JPS5485712A - Magnetic disc write protection system - Google Patents

Magnetic disc write protection system

Info

Publication number
JPS5485712A
JPS5485712A JP15392977A JP15392977A JPS5485712A JP S5485712 A JPS5485712 A JP S5485712A JP 15392977 A JP15392977 A JP 15392977A JP 15392977 A JP15392977 A JP 15392977A JP S5485712 A JPS5485712 A JP S5485712A
Authority
JP
Japan
Prior art keywords
switch
write
magnetic disc
medium
permit
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
JP15392977A
Other languages
Japanese (ja)
Inventor
Sen Kikawa
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 JP15392977A priority Critical patent/JPS5485712A/en
Publication of JPS5485712A publication Critical patent/JPS5485712A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions

Landscapes

  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

PURPOSE:To prevent recording content breakdown of media through mis-operation by providing a mechanism which is capable of transmitting the states of ''write inhibit'' and ''write permit'' to the magnetic disc apparatus to the disc medium and detecting this with the disc apparatus. CONSTITUTION:When the write protection display switch 1 provided on the surface of a magnetic disc medium is set to the write permit side, the reflecting mirror 2 provided to the bottom guide of the magnetic disc medium moves in the operating direction of the switch 1 and the quantity of reflected light from the lamp 6 thereunder is sensed by a photo detector 7. When the switch 1 is on the write inhibit side, light falls to the portion of high reflectance of the reflecting plate 2 and the state ''1'' is indicated via the detector 7. When it is on the permit side, the state opposite from the above is set, thus indicating ''0''. when this signal having passed through a control part 17 and the signal from the switch 19 of a display plate 18 are logically added in an OR circuit, the write inhibit is set. Hence, if the switch 1 is on the write inhibit side even if the switch 19 is on the write permit side, the writing to the medium is inhibited. Thereby, recording content breakdown of the medium may be prevented.
JP15392977A 1977-12-20 1977-12-20 Magnetic disc write protection system Pending JPS5485712A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15392977A JPS5485712A (en) 1977-12-20 1977-12-20 Magnetic disc write protection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15392977A JPS5485712A (en) 1977-12-20 1977-12-20 Magnetic disc write protection system

Publications (1)

Publication Number Publication Date
JPS5485712A true JPS5485712A (en) 1979-07-07

Family

ID=15573156

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15392977A Pending JPS5485712A (en) 1977-12-20 1977-12-20 Magnetic disc write protection system

Country Status (1)

Country Link
JP (1) JPS5485712A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63279467A (en) * 1987-05-12 1988-11-16 Sony Corp Write inhibit circuit for floppy disk drive

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63279467A (en) * 1987-05-12 1988-11-16 Sony Corp Write inhibit circuit for floppy disk drive

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