JPS61976A - Magnetic disc device - Google Patents

Magnetic disc device

Info

Publication number
JPS61976A
JPS61976A JP12243085A JP12243085A JPS61976A JP S61976 A JPS61976 A JP S61976A JP 12243085 A JP12243085 A JP 12243085A JP 12243085 A JP12243085 A JP 12243085A JP S61976 A JPS61976 A JP S61976A
Authority
JP
Japan
Prior art keywords
time
servo
head
track
data
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
JP12243085A
Other languages
Japanese (ja)
Inventor
Yoshiyuki Hirano
義行 平野
Kazuo Nakakoshi
中越　和夫
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 JP12243085A priority Critical patent/JPS61976A/en
Publication of JPS61976A publication Critical patent/JPS61976A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
    • G11B5/5526—Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof

Landscapes

  • Moving Of The Head To Find And Align With The Track (AREA)

Abstract

PURPOSE:To prevent positional slippage of a head during the rise time without having influences upon the throughput of the whole by using the data track servo sytem for a certain period after power on and using only a servo face to position the head thereafter. CONSTITUTION:When a track number to be accessed is set in accordance with an access instruction by an object track setting part 30, a head 3 is moved to a position just before the object track by a speed control circuit 31. A time measuring part 31 measures a time T from the power-on time to the start of the access operation, and the head 3 is allowed to follow up a sector servo signal 11 on a data face 23 by a data track servo circuit 33 if the time T is shorter than a preliminarily set time T1. If the time T is longer than the time T1, the head 3 is allowed to follow up a servo signal 22 on a servo face 25 by a servo track servo circuit 34.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は、磁気ディスク装置に関し、特に磁気ディスク
装置におけるデータトラックサーボを用４％、た磁気ヘ
ッド位置決め装置の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic disk drive, and more particularly to an improvement in a magnetic head positioning device using a data track servo in a magnetic disk drive.

〔発明の背景〕[Background of the invention]

磁気ディスク装置では必要な記憶容量を得るため、たと
えば第１図の如くディスク１を一定間隔はなして重ねら
れた組立体２となし、スピンドル５で回転させディスク
の各面に１個あるいは複数個のヘッド３を備えるようヘ
ッドをキャリジ４に櫛形に取りつけてリニアモータ２０
によって後方より駆動する方式が一般に採られる。・そ
の際ヘッドの位置決めの精度を上げるため、ディスク面
のうち一面に位置基準用信号（サーボ信号）２２を書き
込んだサーボ面２５とし、その信号に追従させてサーボ
ヘッド２１を位置決めさせる。しかしこの方法でも、た
とえばサーボ面２２と情報のデータを記録するデータ面
２３の温度の変化などによって、サーボヘッド２１がサ
ーボ信号２２に正しく追従しても、データヘッド２４は
先に書き込まれたデータから位置ずれを生じることがあ
る。In order to obtain the necessary storage capacity in a magnetic disk drive, for example, as shown in FIG. The head 3 is attached to the carriage 4 in a comb shape, and the linear motor 20
Generally, a system is adopted in which the vehicle is driven from the rear. - At this time, in order to improve the accuracy of head positioning, a position reference signal (servo signal) 22 is written on one of the disk surfaces as a servo surface 25, and the servo head 21 is positioned by following the signal. However, even with this method, even if the servo head 21 correctly follows the servo signal 22 due to, for example, a change in temperature between the servo surface 22 and the data surface 23 on which information data is recorded, the data head 24 will not be able to read the previously written data. Misalignment may occur.

この温度変化による位置ずれのうち最も大きいものは装
置の電源投入後、熱的に安定するまでの間（これを立上
り時間と呼ぶ）に生ずるずれである。The largest positional deviation due to temperature changes is the deviation that occurs after the device is powered on until it becomes thermally stable (this is called the rise time).

これを解決する一つの方法として、第２図に示すような
データトラックサーボ方式がある。すなわちデータ面２
３上のデータを記録するトラックＩＯをセクタに分割し
、各セクタの先頭に位置′基準信号（セクタサーボ信号
）１１を書き込み、その信号でヘッド２４とトラック１
０の位置ずれ量を検出しそれが０となるようにリニアモ
ータ２０で修正した後データの記録・再生を行なうなど
何らかの方法で情報の信号と位置の信号を同一トラック
上で読み出すようにしたいわゆるデータトラックサーボ
による位置決め装置がある。例えば特開昭５０−７５０
１４号に記載されている。しかしこの方法の欠点の１つ
を；複数枚のディスクに対し、それぞれヘッドが備えら
れている装置において、ヘッドを切換えて記録・再生を
行なうときに、切換えられたヘッドで位置ずれを検出し
修正するための時間が必要であり、さらにタイミングが
悪いとヘッドの切り換えのためにディスク１回転分待た
なければならないことなどが起り、データの処理能力が
低下することがある。One method for solving this problem is a data track servo system as shown in FIG. That is, data surface 2
Divide the track IO on which data on 3 is recorded into sectors, write a position reference signal (sector servo signal) 11 at the beginning of each sector, and use that signal to control the head 24 and track 1.
The so-called so-called system that reads out the information signal and the position signal on the same track by some method such as detecting the amount of positional deviation of 0 and correcting it with the linear motor 20 so that it becomes 0, then recording and reproducing the data. There is a positioning device using data track servo. For example, JP-A-50-750
It is described in No. 14. However, one of the drawbacks of this method is that when recording/playing is performed by switching heads in a device that is equipped with heads for each of multiple discs, positional deviations are detected and corrected by the switched heads. Furthermore, if the timing is bad, it may be necessary to wait for one rotation of the disk to switch the head, which may reduce the data processing capacity.

あり、データの処理能力を低下させない磁気ヘッド位置
決め手段を具備した磁気ディスク装置を提間が数分〜士
数分であるのに対し、熱的に安定な時間が一日あるいは
それ以上の長い時間になることを利用し、本発明では、
電源投入後一定時間はデータトラックサーボ方式を用い
、それ以後はサーボ面のみを用いて位置決めを行なう如
く構成し第３図は、本発明を適用した装置の機能を示す
ブロック図である。アクセス命令により、目的トラック
設定部３０によってアクセスすべきトラック数が設定さ
れると、速度制御回路３１によって目的トラック直前ま
でヘッドを移動させる。この動作はサーボ信号２２（第
１図中）を横切る数を計数しながら行なう。時間計測部
３２では電源投入時からそのアクセス動作が行なわれる
までの時間Ｔを計測しており、これがあらかじめ設定し
た時間Ｔ１（本実施例では１０分）より小であれば、デ
ータトラックサーボ回路３３においてデータ面２３（第
１図中）のセクタサーボ信号１１に対してヘッドを追従
させ、ＴがＴ□以上であれば、サーボトラックサーボ回
路３４によってヘッドはサーボ面２５（第１図中）のサ
ーボ信号２２に追従が、前記のようにＴ１は磁気ディス
ク装置の使用時間全体の中でわずかであり、全体の処理
能力にはほとんど影響を与えることなく立上り時間中の
ヘッドの位置ずれを防止することができる。However, compared to a magnetic disk drive equipped with a magnetic head positioning means that does not reduce data processing performance, which takes only a few minutes to several minutes, it is possible to maintain thermal stability for a day or more. In the present invention, taking advantage of the fact that
FIG. 3 is a block diagram showing the functions of an apparatus to which the present invention is applied.The data track servo system is used for a certain period of time after the power is turned on, and after that, positioning is performed using only the servo surface. When the number of tracks to be accessed is set by the target track setting unit 30 in response to an access command, the speed control circuit 31 moves the head to just before the target track. This operation is performed while counting the number of crossings of the servo signal 22 (in FIG. 1). The time measurement unit 32 measures the time T from when the power is turned on until the access operation is performed, and if this is smaller than the preset time T1 (10 minutes in this embodiment), the data track servo circuit 33 , the head is caused to follow the sector servo signal 11 on the data surface 23 (in FIG. 1), and if T is greater than or equal to T Although T1 follows the signal 22, as mentioned above, T1 is a small amount of the entire usage time of the magnetic disk device, and the purpose is to prevent the head position shift during the rise time without having almost any effect on the overall processing capacity. Can be done.

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

第１図は磁気ディスク装置の一般例を示す図、第２図は
データトラックサーボ方式を説明する図、および第３図
は本発明の一実施例を示すブロック図である。 図中、■・・・ディスク、３・・・ヘッド、２２・・・
サーボ信号、２５・・・サーボ面、３０・・・目的トラ
ック設定部、３１・・・速度制御回路、３２・・・時間
計測部、３３・・・データトラックサーボ回路、３４・
・・サーボトラックサーボ回路。 晃　１　閂 ８２　閲 第　３　圀FIG. 1 is a diagram showing a general example of a magnetic disk device, FIG. 2 is a diagram explaining a data track servo system, and FIG. 3 is a block diagram showing an embodiment of the present invention. In the figure, ■...Disk, 3...Head, 22...
Servo signal, 25... Servo surface, 30... Target track setting unit, 31... Speed control circuit, 32... Time measurement unit, 33... Data track servo circuit, 34...
...Servo track servo circuit. Akira 1 Bar 82 View 3rd area

Claims (1)

【特許請求の範囲】[Claims] １、位置基準専用トラックが書かれたディスク面と位置
基準用信号を含むデータの記録再生用ディスク面とを有
する磁気ディスクと、該ディスクにおけるアクセスすべ
き所定位置にヘッドを移動させる手段とを有し、電源投
入後の時間を計測し、該計測時間が所定時間より小であ
れば、前記位置基準用信号を参照して前記ヘッドを所定
位置にアクセスし、前記計測時間が所定時間より大であ
れば前記位置基準専用トラックを参照して前記ヘッドを
所定位置にアクセスすることを特徴とする磁気ディスク
装置。1. A magnetic disk having a disk surface on which a track dedicated to position reference is written and a disk surface for recording and reproducing data including a position reference signal, and means for moving a head to a predetermined position to be accessed on the disk. The time after the power is turned on is measured, and if the measured time is smaller than a predetermined time, the head is accessed to a predetermined position by referring to the position reference signal, and the measured time is larger than a predetermined time. A magnetic disk device characterized in that the head is accessed to a predetermined position by referring to the position reference track, if any.
JP12243085A 1985-06-07 1985-06-07 Magnetic disc device Pending JPS61976A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12243085A JPS61976A (en) 1985-06-07 1985-06-07 Magnetic disc device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12243085A JPS61976A (en) 1985-06-07 1985-06-07 Magnetic disc device

Publications (1)

Publication Number Publication Date
JPS61976A true JPS61976A (en) 1986-01-06

Family

ID=14835645

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12243085A Pending JPS61976A (en) 1985-06-07 1985-06-07 Magnetic disc device

Country Status (1)

Country Link
JP (1) JPS61976A (en)

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