JPS6448205A - Magnetic disk driving device - Google Patents
Magnetic disk driving deviceInfo
- Publication number
- JPS6448205A JPS6448205A JP20449287A JP20449287A JPS6448205A JP S6448205 A JPS6448205 A JP S6448205A JP 20449287 A JP20449287 A JP 20449287A JP 20449287 A JP20449287 A JP 20449287A JP S6448205 A JPS6448205 A JP S6448205A
- Authority
- JP
- Japan
- Prior art keywords
- erasing
- signal
- reading out
- timing
- magnetic disk
- 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
- Digital Magnetic Recording (AREA)
Abstract
PURPOSE:To surely erase the desired part of a magnetic disk and to avert the deterioration in C/N (carrier to noise ratio) of the reading out signal of the signal written after the erasing by the erased residual magnetization pattern by controlling the timing to supply an erasing signal. CONSTITUTION:This device has a pair of magnetic heads Ha, Hb which are different in gap azimuth from each other and are commonly used for writing, reading out and erasing, an erasing signal source 21 which supplies the erasing signal and a timing control circuit 22 which controls the timing to supply the erasing signal. An index signal is extracted by the erasing timing control circuit 22 from the data read out by the magnetic head Ha and the erasing signal is supplied to erase this part at the time of erasing the data of the desired sector of tracks Ta. Since the tracks Ta are erased by the magnetic head Hb of the gap azimuth different from the recording azimuth thereof, the deterioration in the C/N of the reading out signal of the signal written afterward by the residual magnetization of the erasing pattern is obviated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20449287A JPS6448205A (en) | 1987-08-18 | 1987-08-18 | Magnetic disk driving device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20449287A JPS6448205A (en) | 1987-08-18 | 1987-08-18 | Magnetic disk driving device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6448205A true JPS6448205A (en) | 1989-02-22 |
Family
ID=16491425
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20449287A Pending JPS6448205A (en) | 1987-08-18 | 1987-08-18 | Magnetic disk driving device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6448205A (en) |
-
1987
- 1987-08-18 JP JP20449287A patent/JPS6448205A/en active Pending
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