JPS54146618A - Writing protective method - Google Patents
Writing protective methodInfo
- 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
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
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)
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 |
-
1978
- 1978-05-08 JP JP5431978A patent/JPS54146618A/en active Pending
Cited By (3)
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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