JPS54146618A - Writing protective method - Google Patents

Writing protective method

Info

Publication number
JPS54146618A
JPS54146618A JP5431978A JP5431978A JPS54146618A JP S54146618 A JPS54146618 A JP S54146618A JP 5431978 A JP5431978 A JP 5431978A JP 5431978 A JP5431978 A JP 5431978A JP S54146618 A JPS54146618 A JP S54146618A
Authority
JP
Japan
Prior art keywords
data
writing
address
register
permission
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
JP5431978A
Other languages
Japanese (ja)
Inventor
Akira Iwamoto
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP5431978A priority Critical patent/JPS54146618A/en
Publication of JPS54146618A publication Critical patent/JPS54146618A/en
Pending legal-status Critical Current

Links

Landscapes

  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

PURPOSE: To positively protect the writing of one portion of a memeory medium, by permission and inhibition controlling the writing of data to a data memory block of interest on the basis of the reading contents of a specified information area.
CONSTITUTION: Data read by means of a memory medium MD are wave-form shaped to digital signals through a reading amplifier 101, and successively stored to a reading data register 102 in one data memory block unit, and the coincidence of an assigned address and an address is detected by means of an address coincidence detecting circuit 103 in the address data of an address portion A(i) stored at the register 102. The presence or absence of protection for writing, the permission and inhibition of writing, are decided by means of a decision portion 104 in the data of a specified information area X(i) stord at the register 102, and writing data WD are written to a data area D(i) of a data memory block DB(i) of interest by means of a writing control portion 105 if permission signals are emitted. Whdn writing inhibition signals are issued, writing to the data area of the block DB(i) is inhibited.
COPYRIGHT: (C)1979,JPO&Japio
JP5431978A 1978-05-08 1978-05-08 Writing protective method Pending JPS54146618A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5431978A JPS54146618A (en) 1978-05-08 1978-05-08 Writing protective method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5431978A JPS54146618A (en) 1978-05-08 1978-05-08 Writing protective method

Publications (1)

Publication Number Publication Date
JPS54146618A true JPS54146618A (en) 1979-11-16

Family

ID=12967255

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5431978A Pending JPS54146618A (en) 1978-05-08 1978-05-08 Writing protective method

Country Status (1)

Country Link
JP (1) JPS54146618A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4578722A (en) * 1982-12-23 1986-03-25 International Business Machines Corporation Method for checking disk identity in a flexible disk recorder
JPS61158074A (en) * 1984-12-28 1986-07-17 Matsushita Electric Ind Co Ltd Erasable optical disc device
US4761772A (en) * 1983-10-31 1988-08-02 Kabushiki Kaisha Toshiba Optical disk recording and reproducing apparatus reliably providing access to desired tracks

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4578722A (en) * 1982-12-23 1986-03-25 International Business Machines Corporation Method for checking disk identity in a flexible disk recorder
US4761772A (en) * 1983-10-31 1988-08-02 Kabushiki Kaisha Toshiba Optical disk recording and reproducing apparatus reliably providing access to desired tracks
JPS61158074A (en) * 1984-12-28 1986-07-17 Matsushita Electric Ind Co Ltd Erasable optical disc device

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