JPS6410466A - Data recording and reproducing method for magnetic disk - Google Patents
Data recording and reproducing method for magnetic diskInfo
- Publication number
- JPS6410466A JPS6410466A JP16611487A JP16611487A JPS6410466A JP S6410466 A JPS6410466 A JP S6410466A JP 16611487 A JP16611487 A JP 16611487A JP 16611487 A JP16611487 A JP 16611487A JP S6410466 A JPS6410466 A JP S6410466A
- Authority
- JP
- Japan
- Prior art keywords
- data
- recording
- reproducing
- density
- 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
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
PURPOSE:To actually increase the memory capacity of a magnetic disk by recording data at double density in an exclusive reproduction zone and reproducing at double density, and in a recording and reproducing zone recording and reproducing at single density. CONSTITUTION:In the exclusive reproduction zone of a magnetic disk data are recorded at double density in advance. In case of reproducing the data via a magnetic head 8 from the exclusive reproduction zone, a changing over switch 11 is switched by a CPU 2 to read the recording signal at double density read by the head 8 from the disk and after amplifying it by a circuit 9 it is demodulated by removing a clock signal by a demodulation circuit 7. On the other hand, in case of demodulating the data in a recording and reproducing zone the recording signal at single density read by the head 8 from the disk is reproduced in the data of single density by a demodulation circuit 6 by switching the switch 11 by the CPU 2. It is also written at single density in the data field of the disk via the data modulation circuit 5 and writing circuit 10 from the CPU 2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16611487A JPS6410466A (en) | 1987-07-01 | 1987-07-01 | Data recording and reproducing method for magnetic disk |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16611487A JPS6410466A (en) | 1987-07-01 | 1987-07-01 | Data recording and reproducing method for magnetic disk |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6410466A true JPS6410466A (en) | 1989-01-13 |
Family
ID=15825284
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16611487A Pending JPS6410466A (en) | 1987-07-01 | 1987-07-01 | Data recording and reproducing method for magnetic disk |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6410466A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005508995A (en) * | 2001-11-13 | 2005-04-07 | ヤマノウチ ファーマ テクノロジーズ インコーポレイテッド | Water-soluble drug sustained release technology |
-
1987
- 1987-07-01 JP JP16611487A patent/JPS6410466A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005508995A (en) * | 2001-11-13 | 2005-04-07 | ヤマノウチ ファーマ テクノロジーズ インコーポレイテッド | Water-soluble drug sustained release technology |
JP4882200B2 (en) * | 2001-11-13 | 2012-02-22 | アステラス製薬株式会社 | Water-soluble drug sustained release technology |
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