JPS5555479A - Magnetic disc driver - Google Patents

Magnetic disc driver

Info

Publication number
JPS5555479A
JPS5555479A JP12818078A JP12818078A JPS5555479A JP S5555479 A JPS5555479 A JP S5555479A JP 12818078 A JP12818078 A JP 12818078A JP 12818078 A JP12818078 A JP 12818078A JP S5555479 A JPS5555479 A JP S5555479A
Authority
JP
Japan
Prior art keywords
write
magnetic disc
circuit
face
signal
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
JP12818078A
Other languages
Japanese (ja)
Inventor
Fusaki Miura
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP12818078A priority Critical patent/JPS5555479A/en
Publication of JPS5555479A publication Critical patent/JPS5555479A/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 obtain a magnetic disc driver where operation is easy and cancel of preceding information dependent upon rewrite is prevented, by providing a selection means which inhibits rewrite to one face of a two-face recording medium which files information on both sides. CONSTITUTION:A write protect mark provided on the jacket of a magnetic discket is detected by detector 1, and digital signal e2 is formed by detection circuit 2. When this signal is inputted to OR circuit 3, output e5 becomes High independently of one input signal e4. Since output e9 of NAND circuit 6 becomes Low, write function circuit 7 becomes a non-operation state to prevent write. Simultaneously, interface output signal e10 becomes Low to indicate that the magnetic disc is in a write protect state. By this constitution, write is inhibited to a specific face of plural recording faces of the magnetic disc.
JP12818078A 1978-10-17 1978-10-17 Magnetic disc driver Pending JPS5555479A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12818078A JPS5555479A (en) 1978-10-17 1978-10-17 Magnetic disc driver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12818078A JPS5555479A (en) 1978-10-17 1978-10-17 Magnetic disc driver

Publications (1)

Publication Number Publication Date
JPS5555479A true JPS5555479A (en) 1980-04-23

Family

ID=14978395

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12818078A Pending JPS5555479A (en) 1978-10-17 1978-10-17 Magnetic disc driver

Country Status (1)

Country Link
JP (1) JPS5555479A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51124414A (en) * 1975-04-22 1976-10-29 Mitsubishi Electric Corp Protective apparatus for magnetic sheet
JPS53108412A (en) * 1977-03-04 1978-09-21 Hitachi Ltd Memory protecting system for disc pack

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51124414A (en) * 1975-04-22 1976-10-29 Mitsubishi Electric Corp Protective apparatus for magnetic sheet
JPS53108412A (en) * 1977-03-04 1978-09-21 Hitachi Ltd Memory protecting system for disc pack

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