JPH0185958U - - Google Patents
Info
- Publication number
- JPH0185958U JPH0185958U JP18150087U JP18150087U JPH0185958U JP H0185958 U JPH0185958 U JP H0185958U JP 18150087 U JP18150087 U JP 18150087U JP 18150087 U JP18150087 U JP 18150087U JP H0185958 U JPH0185958 U JP H0185958U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- flexible disk
- circuit
- prohibition signal
- start position
- 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
- 238000001514 detection method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Landscapes
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
Description
第１図は本考案の実施例を示すブロツク図、第
２図は禁止信号形成回路の一例を示すブロツク図
、第３図はフレキシブルデイスクの磁気デイスク
のフオーマツトを示す説明図、第４図は第３図の
フオーマツトの一部を拡大して示す説明図、第５
図は同実施例の動作を説明するために示すタイム
チヤート、第６図はフレキシブルデイスク装置の
概要を示す構成図、第７図及び第８図は従来のト
ラツク開始位置信号の検出方法を説明するために
示す図、第９図乃至第１１図は従来のトラツク開
始位置信号の他の検出方法を説明するために示す
図である。
２′……フレキシブルデイスク、６……トラツ
ク開始位置信号、７……サーボ情報、４０……検
出回路、４１……バンドパスフイルタ、４２……
出力比較器、５０……禁止信号形成回路、１２０
′……リード・ライト回路、１２０ａ……増幅回
路、１２０ｂ……書き込み回路、１２０ｆ……ナ
ンド回路。
FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing an example of a prohibition signal forming circuit, FIG. 3 is an explanatory diagram showing the format of a magnetic disk of a flexible disk, and FIG. Explanatory diagram showing an enlarged part of the format in Figure 3, No. 5
The figure is a time chart shown to explain the operation of the same embodiment, FIG. 6 is a block diagram showing an outline of the flexible disk device, and FIGS. 7 and 8 are used to explain a conventional method of detecting a track start position signal. 9 to 11 are diagrams shown for explaining another conventional method of detecting a track start position signal. 2'... Flexible disk, 6... Track start position signal, 7... Servo information, 40... Detection circuit, 41... Bandpass filter, 42...
Output comparator, 50...Prohibition signal forming circuit, 120
'...Read/write circuit, 120a...Amplification circuit, 120b...Write circuit, 120f...NAND circuit.
Claims (1)
ともに、このトラツク開始位置信号から一定時間
遅れてサーボ情報が記録されているフレキシブル
デイスクを、記録・再生可能としてなるフレキシ
ブルデイスク装置であつて、トラツク開始位置信
号を検出してインデツクス信号とする検出回路と
、この検出回路からのインデツクス信号に基づい
て書き込み禁止信号を形成する禁止信号形成回路
とを備え、前記禁止信号形成回路からの書き込み
禁止信号があるときにデータ書き込みを禁止する
回路構成としたことを特徴とするフレキシブルデ
イスク装置。 A flexible disk device capable of recording and reproducing a flexible disk on which a track start position signal is recorded in advance and servo information is recorded with a certain time delay from this track start position signal. a detection circuit that detects and generates an index signal, and a prohibition signal forming circuit that forms a write prohibition signal based on the index signal from the detection circuit, and when there is a write prohibition signal from the prohibition signal forming circuit. A flexible disk device characterized by having a circuit configuration that prohibits data writing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18150087U JPH0185958U (en) | 1987-11-28 | 1987-11-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18150087U JPH0185958U (en) | 1987-11-28 | 1987-11-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0185958U true JPH0185958U (en) | 1989-06-07 |
Family
ID=31472983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18150087U Pending JPH0185958U (en) | 1987-11-28 | 1987-11-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0185958U (en) |
-
1987
- 1987-11-28 JP JP18150087U patent/JPH0185958U/ja active Pending
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