JPS558629A - Defect avoiding system in magnetic recording device - Google Patents
Defect avoiding system in magnetic recording deviceInfo
- Publication number
- JPS558629A JPS558629A JP7957878A JP7957878A JPS558629A JP S558629 A JPS558629 A JP S558629A JP 7957878 A JP7957878 A JP 7957878A JP 7957878 A JP7957878 A JP 7957878A JP S558629 A JPS558629 A JP S558629A
- Authority
- JP
- Japan
- Prior art keywords
- head
- read
- write
- indication signal
- defect
- 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 eliminate the rotation wait at a defective part write time and the limit of the nymber of defects by writing defect indication signals on a data track previously and detecting them by an advanced read head which precedes a write head.
CONSTITUTION: When defective part DEF is detected in the test of a magnetic disc, detect start indication signal M1 and defect end indication signal M2 are written before and after the defective part respectively, and advanced read head 4-1 and read/write head 4-2 are provided in head assembly 1. When advanced read head 4-1 reads defect start indication signal M1 at a read/write time, detection circuit 5 detects it to report it to control circuit 2, thereby causing control circuit 2 to stop reading/writing. Next, when advanced read head 4-1 reads defect end indication signal M2, detection circuit 5 detects it to report it to control circuit 2, thereby restarting read/write after a prescribed distance movement.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7957878A JPS558629A (en) | 1978-06-30 | 1978-06-30 | Defect avoiding system in magnetic recording device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7957878A JPS558629A (en) | 1978-06-30 | 1978-06-30 | Defect avoiding system in magnetic recording device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS558629A true JPS558629A (en) | 1980-01-22 |
Family
ID=13693861
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7957878A Pending JPS558629A (en) | 1978-06-30 | 1978-06-30 | Defect avoiding system in magnetic recording device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS558629A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5866915A (en) * | 1981-10-19 | 1983-04-21 | Nippon Kogaku Kk <Nikon> | Method and device for recording and reproducing of picture |
JPS61170961A (en) * | 1985-01-23 | 1986-08-01 | Matsushita Electric Ind Co Ltd | Optical information recording and reproducing device |
JPH063966U (en) * | 1992-06-22 | 1994-01-18 | 津田駒工業株式会社 | Yarn sheet conveying device with yarn breakage detection function |
-
1978
- 1978-06-30 JP JP7957878A patent/JPS558629A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5866915A (en) * | 1981-10-19 | 1983-04-21 | Nippon Kogaku Kk <Nikon> | Method and device for recording and reproducing of picture |
JPS6356528B2 (en) * | 1981-10-19 | 1988-11-08 | Nippon Kogaku Kk | |
JPS61170961A (en) * | 1985-01-23 | 1986-08-01 | Matsushita Electric Ind Co Ltd | Optical information recording and reproducing device |
JPH063966U (en) * | 1992-06-22 | 1994-01-18 | 津田駒工業株式会社 | Yarn sheet conveying device with yarn breakage detection function |
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