JP2520489B2 - Flexible disk device - Google Patents
Flexible disk deviceInfo
- Publication number
- JP2520489B2 JP2520489B2 JP1298079A JP29807989A JP2520489B2 JP 2520489 B2 JP2520489 B2 JP 2520489B2 JP 1298079 A JP1298079 A JP 1298079A JP 29807989 A JP29807989 A JP 29807989A JP 2520489 B2 JP2520489 B2 JP 2520489B2
- Authority
- JP
- Japan
- Prior art keywords
- track density
- flexible disk
- disk device
- select signal
- head
- 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.)
- Expired - Fee Related
Links
Landscapes
- Digital Magnetic Recording (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はフレキシブルディスク装置に関し、特にサイ
ドイレースを行なわない高トラック密度のフレキシブル
ディスク装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible disk device, and more particularly to a high track density flexible disk device that does not perform side erase.
〔従来の技術〕 従来、フレキシブルディスク装置はサイドイレースヘ
ッドおよびサイドイレースヘッド用回路を有していなか
った。[Prior Art] Conventionally, a flexible disk device does not have a side erase head and a circuit for the side erase head.
上述した従来のフレキシブルディスク装置はサイドイ
レースを行わないので、低トラック密度装置で書かれた
媒体を重ね書きした場合に消し残りが生じるという欠点
がある。Since the above-mentioned conventional flexible disk device does not perform side erase, it has a drawback that when a medium written by a low track density device is overwritten, an unerased portion remains.
本発明のフレキシブルディスク装置は、ホストより送
られるライトゲート信号に接続されたディレイ回路と、
前記ディレイ回路の出力とホストより送られるサイドセ
レクト信号とトラック密度選択信号を入力しトラック密
度切換信号が低密度時のみサイドセレクト信号で選択さ
れたサイドイレースヘッドをONさせる論理回路と、前記
論理回路に接続されたサイドイレースヘッドとを有す
る。The flexible disk device of the present invention includes a delay circuit connected to a write gate signal sent from a host,
A logic circuit for inputting the output of the delay circuit, a side select signal and a track density selection signal sent from the host, and turning on the side erase head selected by the side select signal only when the track density switching signal is low density, and the logic circuit. And a side erase head connected to.
第１図は本発明の一実施例の回路図である。また、第
３図は本発明の実施例のヘッドの配置図、第４図は従来
例のヘッド配置図、第５図は低トラック密度装置のヘッ
ド配置図である。本発明のリードライトヘッドは従来例
と同じ位置にあり、２つのサイドイレースヘッドとリー
ドライトヘッドの合計した幅は、低トラック密度装置の
場合第５図と同一になっている。FIG. 1 is a circuit diagram of an embodiment of the present invention. Further, FIG. 3 is a layout of heads according to an embodiment of the present invention, FIG. 4 is a layout of heads of a conventional example, and FIG. 5 is a layout of heads of a low track density device. The read / write head of the present invention is at the same position as in the conventional example, and the total width of the two side erase heads and the read / write head is the same as in FIG. 5 in the case of the low track density device.
第２図は上記のフレキシブルディスク装置の動作を示
すタイムチャートである。同図においてトラック密度選
択信号がＬレベルの時、本フレキシブルディスク装置は
低トラック密度状態になっている。この状態で低トラッ
ク密度の媒体を重ね書きする場合、ライトゲート信号は
ディレイ回路１を通り、遅延されイレースゲート信号に
なる。サイドセレクト信号がＨレベルのときは、サイド
０側のサイドイレースヘッド３がONする。サイドセレク
ト信号がＬの時はサイド１側のサイドイレースヘッド４
がONする。重ね書きされる低トラック密度媒体のトラッ
ク中心位置がずれている場合でも第６図のように消し残
りは生じない。そのため、重ね書きされた媒体は第７図
のように低トラック密度装置においてもリード可能とな
る。FIG. 2 is a time chart showing the operation of the above flexible disk device. In the figure, when the track density selection signal is at L level, the flexible disk device is in a low track density state. When a medium with a low track density is overwritten in this state, the write gate signal passes through the delay circuit 1 and is delayed to become an erase gate signal. When the side select signal is at the H level, the side erase head 3 on the side 0 side is turned on. Side erase head 4 on the side 1 side when the side select signal is L
Turns ON. Even if the track center position of the overwritten low track density medium is deviated, there is no unerased residue as shown in FIG. Therefore, the overwritten medium can be read by a low track density device as shown in FIG.
トラック密度選択信号がＨレベルの時は、従来と同じ
ようにサイドイレースを行なわず、第８図で示すように
高トラック密度となる。When the track density selection signal is at H level, side erase is not performed as in the conventional case, and the track density becomes high as shown in FIG.
以上説明したように本発明によれば、サイドイレース
を行なわない高トラック密度装置が低トラック密度装置
と互換性を持つ効果がある。As described above, according to the present invention, a high track density device that does not perform side erase has an effect of being compatible with a low track density device.
第１図は本発明の一実施例を示す回路図、第２図は動作
を示すタイムチャート、第３図はヘッド配置図、第４図
は従来例のヘッド配置図、第５図は低トラック密度装置
のヘッド配置図、第６図〜第８図は、動作の例を示す説
明図である。 １……ディレイ回路、２……論理回路、3,4……サイド
イレースヘッド。FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a time chart showing the operation, FIG. 3 is a head layout diagram, FIG. 4 is a conventional head layout diagram, and FIG. 5 is a low track. FIG. 6 to FIG. 8 are head layout diagrams of the density device, and are explanatory diagrams showing an example of the operation. 1 ... Delay circuit, 2 ... Logic circuit, 3, 4 ... Side erase head.
Claims (1)
続されたディレイ回路と、前記ディレイ回路の出力とホ
ストより送られるサイドセレクト信号とトラック密度選
択信号を入力しトラック密度切換信号が低密度時のみサ
イドセレクト信号で選択されたサイドイレースヘッドを
ONさせる論理回路と、前記論理回路に接続されたサイド
イレースヘッドとを有することを特徴とするフレキシブ
ルディスク装置。1. A delay circuit connected to a write gate signal sent from a host, an input of the output of the delay circuit, a side select signal and a track density select signal sent from the host, and only when the track density switching signal is low density. The side erase head selected by the side select signal
A flexible disk device comprising a logic circuit to be turned on and a side erase head connected to the logic circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1298079A JP2520489B2 (en) | 1989-11-15 | 1989-11-15 | Flexible disk device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1298079A JP2520489B2 (en) | 1989-11-15 | 1989-11-15 | Flexible disk device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03157805A JPH03157805A (en) | 1991-07-05 |
| JP2520489B2 true JP2520489B2 (en) | 1996-07-31 |
Family
ID=17854881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1298079A Expired - Fee Related JP2520489B2 (en) | 1989-11-15 | 1989-11-15 | Flexible disk device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2520489B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5353170A (en) * | 1993-05-19 | 1994-10-04 | International Business Machines Corporation | Error recovery data storage system and method with two position read verification |
| US6816653B2 (en) | 2003-02-25 | 2004-11-09 | Corning Incorporated | Passive alignment of optical fibers with optical elements |
-
1989
- 1989-11-15 JP JP1298079A patent/JP2520489B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03157805A (en) | 1991-07-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| LAPS | Cancellation because of no payment of annual fees |