JPH01311467A - Magnetic disk device - Google Patents

Magnetic disk device

Info

Publication number
JPH01311467A
JPH01311467A JP13928388A JP13928388A JPH01311467A JP H01311467 A JPH01311467 A JP H01311467A JP 13928388 A JP13928388 A JP 13928388A JP 13928388 A JP13928388 A JP 13928388A JP H01311467 A JPH01311467 A JP H01311467A
Authority
JP
Japan
Prior art keywords
signal
data
read
control mechanism
index
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
Application number
JP13928388A
Other languages
Japanese (ja)
Inventor
Takashi Nohara
野原 高史
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP13928388A priority Critical patent/JPH01311467A/en
Publication of JPH01311467A publication Critical patent/JPH01311467A/en
Pending legal-status Critical Current

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  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

PURPOSE:To prevent malfunction by evading the competition with read and write operations by masking an index signal not to output to a control mechanism during a head positioning operation of the magnetic disk device. CONSTITUTION:An index mask signal 14 is outputted from a control circuit 3 during the head positioning operation, and the index signal 13 is masked by an index mask circuit 2 so as not to output an on-index signal 17 to the control mechanism via an interface circuit 1. In this case, suppose that a read/ write operation control signal being sent from the control mechanism via a control signal 16 competes with the head positioning operation, so that data of a servo cylinder for a medium 10 is outputted to a data read signal 15. However, since the signal 17 as an error detection factor cannot be detected by the control mechanism, data of a data cylinder as the normal data or the signal 17 should be expected, so that as it turns out without making an error, the read/write can normally be executed.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、磁気ディスク装置に係り、特に誤動作防止に
好適な制御方法に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and particularly to a control method suitable for preventing malfunctions.

〔従来の技術〕[Conventional technology]

従来技術は、磁気ディスク装置が位置決め補正動作中は
ダミーデータ等を送出して制御機構でのエラー検出を期
待し、エラー回復処理で誤動作防止する方法および特開
昭61−228510号の様に、特に制御機構側の動作
を意識していないものもある。
Conventional techniques include a method in which a magnetic disk drive sends dummy data during positioning correction operation in the hope that the control mechanism will detect an error, and prevents malfunction through error recovery processing; Some people are not particularly aware of the operation of the control mechanism.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

従来技術は、ヘッド位置決め補正動作と制御機構からの
リード、ライト動作の競合の点について配慮がされてお
らず、誤動作の問題があった。
The conventional technology does not take into consideration the conflict between the head positioning correction operation and the read and write operations from the control mechanism, resulting in the problem of malfunction.

本発明の目的は、制御機構が、ヘッド位置決め補正動作
有無を意識せずにリード、ライト動作可能とすることに
ある。
An object of the present invention is to enable a control mechanism to perform read and write operations without being aware of the presence or absence of head positioning correction operations.

〔課題を解決するための手段〕[Means to solve the problem]

上記目的は、インデックス信号をマスクすることにより
、達成される。
The above objective is achieved by masking the index signal.

〔作用〕[Effect]

制御機構のエラー検出動作は、インデックス信号を3回
検出するまで、リード、ライト動作は終了しないように
動作するので磁気ディスク装置がヘッド位置決め動作中
インデックス信号をマスクし、動作終了後マスク解除し
て、制御機構からのリード、ライト動作を実行するので
誤動作することかない。
The error detection operation of the control mechanism is such that read and write operations do not end until the index signal is detected three times, so the magnetic disk drive masks the index signal during head positioning and releases the mask after the operation is completed. Since read and write operations are executed from the control mechanism, there is no possibility of malfunction.

〔実施例〕〔Example〕

本発明の一実施例を第1図、第2図により説明する。 An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

第1図は、磁気ディスク装置の制御ブロック図を示し、
第2図は、媒体上のデータシリンダとサーボデータシリ
ンダの位置関係を示す。以下に本発明の動作説明をする
FIG. 1 shows a control block diagram of a magnetic disk device,
FIG. 2 shows the positional relationship between the data cylinder and servo data cylinder on the medium. The operation of the present invention will be explained below.

電源が投入されると、制御回路3より、スピンドルモー
タ駆動回路7にスピンドルモータオン信号を送出し、ス
ピンドルモータ11を駆動する。
When the power is turned on, the control circuit 3 sends a spindle motor on signal to the spindle motor drive circuit 7 to drive the spindle motor 11.

11が回転するとセンサ12でセンスされた信号はイン
デックス検出回路6に送られて6で生成されたインデッ
クス信号13は、3に送られ3で11が定常回転になっ
たかをチエツクする。定常回転に達したならばインタフ
ェース回路1を経由して、レディ信号を制御信号線16
で制御機構に送る。このとき3からヘッド駆動制御回路
4にヘット移動信号を送出し4でヘッド駆動回路8を動
作させてヘッド9を移動させて媒体10の第2図で示す
データシリンダ19の間にあるサーボシリンダ18の情
報を9で読み取ってデータリード/ライト回路5に送り
5から3に送ってそのデータを3で解析しヘッド位置ず
れがあれば4に補正用信号を送り8を動作させて9を動
かしてヘッド位置決め補正を行う、ヘッド位置決め動作
を終了すると元の19へ戻す。この一連の動作を随時行
って常に正常な位置に9を保って19のデータが正しく
リード/ライトできる様にする。このヘッド位置決め動
作中はインデックスマスク信号14を3より出力し、イ
ンデックスマスク回路2で13をマスクして1経由イン
デックスオン信号17を制御機構に出力しない様にする
。このとき制御機構より16を経由して送られたり−ド
/ライト動作制御信号とヘッド位置決め動作が競合して
18のデータが5,1経山デ一タリード信号15に出力
されても制御機構では、エラー検出要因のインデックス
オン信号17が検出出来ないのでエラー検出できないこ
とにより、正常データである19のデータかまたは、1
7を待つことになるため、結果的には、エラーとならず
正常にリード/ライトが実行出来ることになる。
When 11 rotates, a signal sensed by sensor 12 is sent to index detection circuit 6, an index signal 13 generated by 6 is sent to 3, and 3 checks whether 11 is rotating normally. When steady rotation is reached, a ready signal is sent to the control signal line 16 via the interface circuit 1.
is sent to the control mechanism. At this time, a head movement signal is sent from 3 to the head drive control circuit 4, and 4 operates the head drive circuit 8 to move the head 9 to the servo cylinder 18 between the data cylinders 19 of the medium 10 shown in FIG. 9 reads the information, sends it to the data read/write circuit 5, sends it from 5 to 3, analyzes the data in 3, and if there is a head position deviation, sends a correction signal to 4, activates 8, and moves 9. When the head positioning correction is completed and the head positioning operation is completed, the process returns to the original 19. This series of operations is performed as needed to keep 9 at the normal position so that data 19 can be read/written correctly. During this head positioning operation, the index mask signal 14 is output from 3, and the index mask circuit 2 masks 13 so that the index on signal 17 via 1 is not output to the control mechanism. At this time, even if the data of 18 is output to the 5, 1 data read signal 15 due to conflict between the read/write operation control signal and the head positioning operation sent from the control mechanism via 16, the control mechanism does not , since the index-on signal 17, which is the error detection factor, cannot be detected, the error cannot be detected.
7, the result is that the read/write can be executed normally without an error.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、ヘッド位置決め動作と、制御機構から
のリード、ライト動作の競合が回避出来るので誤動作防
止の効果がある。
According to the present invention, conflict between the head positioning operation and the read and write operations from the control mechanism can be avoided, thereby preventing malfunctions.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は、本発明の一実施例の磁気ディスク装置ブロッ
ク図、第2図は、媒体上のデータシリンダとサーボシリ
ンダの位置関係を示す説明図である。 1・・・インタフェース回路、2・・・インデックス信
号マスク回路、3・・・制御回路、4・・・ヘッド移動
制御回路、5・・・データリードライト回路、6・・・
インデックス信号検出回路、7・・・スピンドルモータ
制御回路、8・・・ヘッド駆動回路、9・・・ヘッド、
1゜・・・媒体、11・・・スピンドルモータ、12・
・・センサ、13・・・インデックス信号、14・・・
インデックスマスク信号、15・・・データリード/ラ
イト信号、16・・・制御信号、17・・・インデック
ス信号、18・・・サーボシリンダ、19・・データシ
リンダ。
FIG. 1 is a block diagram of a magnetic disk device according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing the positional relationship between a data cylinder and a servo cylinder on a medium. DESCRIPTION OF SYMBOLS 1... Interface circuit, 2... Index signal mask circuit, 3... Control circuit, 4... Head movement control circuit, 5... Data read/write circuit, 6...
Index signal detection circuit, 7... Spindle motor control circuit, 8... Head drive circuit, 9... Head,
1°...Medium, 11...Spindle motor, 12.
...Sensor, 13...Index signal, 14...
Index mask signal, 15... Data read/write signal, 16... Control signal, 17... Index signal, 18... Servo cylinder, 19... Data cylinder.

Claims (1)

【特許請求の範囲】[Claims] 1、データシリンダと、データシリンダの中間にサーボ
シリンダを有する磁気ディスク装置において、ヘッド位
置決め補正動作中は、インデックス信号をマスクして制
御機構へ出力しない手段を設け、ヘッド位置決め補正動
作と制御機構からのリード、ライト動作との競合を回避
して誤動作防止することを特徴とした磁気ディスク装置
1. In a magnetic disk drive having a data cylinder and a servo cylinder between the data cylinders, a means is provided to mask the index signal and not output it to the control mechanism during the head positioning correction operation, so that the head positioning correction operation and the control mechanism are not affected. A magnetic disk device characterized by preventing malfunctions by avoiding conflicts with read and write operations.
JP13928388A 1988-06-08 1988-06-08 Magnetic disk device Pending JPH01311467A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13928388A JPH01311467A (en) 1988-06-08 1988-06-08 Magnetic disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13928388A JPH01311467A (en) 1988-06-08 1988-06-08 Magnetic disk device

Publications (1)

Publication Number Publication Date
JPH01311467A true JPH01311467A (en) 1989-12-15

Family

ID=15241674

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13928388A Pending JPH01311467A (en) 1988-06-08 1988-06-08 Magnetic disk device

Country Status (1)

Country Link
JP (1) JPH01311467A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02193363A (en) * 1989-01-20 1990-07-31 Nec Corp Magnetic disk control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02193363A (en) * 1989-01-20 1990-07-31 Nec Corp Magnetic disk control system

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