JPS619877A - Servo sector detecting system - Google Patents

Servo sector detecting system

Info

Publication number
JPS619877A
JPS619877A JP12918984A JP12918984A JPS619877A JP S619877 A JPS619877 A JP S619877A JP 12918984 A JP12918984 A JP 12918984A JP 12918984 A JP12918984 A JP 12918984A JP S619877 A JPS619877 A JP S619877A
Authority
JP
Japan
Prior art keywords
period
servo
servo sector
sector
monostable multivibrator
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
JP12918984A
Other languages
Japanese (ja)
Inventor
Juko Sugaya
寿鴻 菅谷
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP12918984A priority Critical patent/JPS619877A/en
Publication of JPS619877A publication Critical patent/JPS619877A/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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing

Abstract

PURPOSE:To detect a servo sector stably even when the erasing section is short by detecting the servo sector by using outputs of the first and second monostable multivibrators having specified oscillating periods respectively. CONSTITUTION:Signals read out from a magnetic head are sent to the first monostable multivibrator 10 having retriggerable functions through a binary coding circuit 9. If the oscillating period of the monostable multivibrator 10 is set at about double servo clock period, an output waveform (b) becomes a low level first in the erasing section. When the oscillating period of the second monostable multivibrator 11 is about a half the 1 sector period, an output (c) becomes a high level in the servo sector area excepting the erasing section, and a signal (d), the logical sum of the signals (b) and (c), becomes a servo sector detecting signal. The logical sum of outputs (b) of monostable multivibrator 10 and outputs (e) of a pulse circuit 15 is obtained, and only the erasing section is used for servo sector detection as an input of the monostable multivibrator 11.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明はセクタサーボ方式におけるサーボセクタ検出方
式に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a servo sector detection method in a sector servo method.

〔発明の技術的背景とその問題点〕[Technical background of the invention and its problems]

セクタサーボ方式は熱的オフトランクがなく、しかもデ
ィスクの両面が使用できることから磁気ディスク装置、
とくにフロッピーディスク装置のヘッド位置決めサーボ
方式として有用である。The sector servo method has no thermal off-trunk and can be used on both sides of the disk, making it ideal for magnetic disk drives.
It is particularly useful as a head positioning servo system for floppy disk drives.

第１図はフロッピーディスク１上のデータセクタ２とサ
ーボセクタ３との関係、及びサーボセクタの詳細を示す
図である。サーボセクタは、サーボセクタを検出するた
めのイレイズ（ＥＲＡＳＢ）部４．ＡＧＣ信号を得るた
めのＡＧＣ部５．サーボゾーンとデータゾーン及び基準
セクタ検出のためのゾーン（ＺＯＮＢ）部６１位置情報
を得るためのポジション（ＰＯ８ＩＴＩＯＮ）部７から
成る。サーボトラックとデータトラックは半トラック分
ズして形成しである。従って、磁気ヘッド８が第１図の
ようにサーボトラックの両１ｉ１１１に半分ずつあると
き、データトラック上にオントラックしていることにな
る。FIG. 1 is a diagram showing the relationship between a data sector 2 and a servo sector 3 on a floppy disk 1, and details of the servo sector. The servo sector is detected by an erase (ERASB) unit 4 for detecting the servo sector. AGC section for obtaining an AGC signal5. It consists of a zone (ZONB) section 61 for detecting a servo zone, a data zone, and a reference sector, and a position (PO8ITION) section 7 for obtaining position information. The servo track and the data track are formed so as to be offset by half a track. Therefore, when the magnetic head 8 is placed on each half of the servo track 1i111 as shown in FIG. 1, it is on-track on the data track.

ＥＲＡＳＥ部の消去部１ｉ−Ｉｉは、一般にＰＯ８ＩＴ
ＩＯＮ部に生ずる消去期間の最長よりも長くなるように
設定している。そして従来サーボセクタの横巾はリトリ
ガラブルモノマルチの発振期間がＰＯ８ＩＴＩＯＮ部の
消去期間の最長よりも長くなるように設定することによ
り行っている。このため位置情報を増加させるとそれに
見合ってＥＲＡＳＥ部の消去期間を長くする必要が生じ
、その分データの記録領域が減る。また：１ＡＳＢ部に
長い消去期間を持たせるとそこにノイズの入り込む確率
が大きくなり、そのためサーボセクタ検出を誤まる確率
が高くなる。Erasing sections 1i-Ii of the ERASE section are generally PO8IT.
It is set to be longer than the longest erasing period that occurs in the ION section. Conventionally, the width of the servo sector is set so that the oscillation period of the retriggerable monomulti is longer than the longest erase period of the PO8ITION section. For this reason, if the position information is increased, it becomes necessary to lengthen the erasing period of the ERASE section, and the data recording area is reduced accordingly. Furthermore, if the 1ASB section has a long erasing period, the probability that noise will enter there increases, and therefore the probability of erroneous servo sector detection increases.

他のサーボセクタの検出は、ＥＲＡＳＥ部の始まりから
カウンターを動作させ、ＥＲＡＳＥ部の終りを検出する
方法、モータの回転を利用する方法などがあるが、いず
れもモータの回転変動（こ大きく左右されるため、長い
消去部を必要とし、ノイズに弱い欠点がある。Other servo sector detection methods include a method of operating a counter from the beginning of the ERASE section to detect the end of the ERASE section, and a method of using the rotation of the motor. Therefore, it requires a long erasing section and is susceptible to noise.

〔発明の目的〕[Purpose of the invention]

本発明は、このような事情を考魅してなされたものでそ
の目的とするところは、短いＥＲＡＳ部でもサーボセク
タを女定に検出できる実用性の高いサーボセクタ検出方
式を提供することである。The present invention has been made in consideration of these circumstances, and its purpose is to provide a highly practical servo sector detection method that can accurately detect servo sectors even with a short ERAS section.

〔発明の概要〕[Summary of the invention]

本発明は２値ｆヒされた続出し信号に対し、発振期間が
サーボクロックの周期よりも畏＜、かつ、ＥＲＡＳＥ部
の消去ｗ！Ｊ間よりも短いリトリガラブル機能を持つｌ
）　ｌのモノマルチと第１のモノマルチバイブレータの
出力を入力とし、発振１１間のサーボセクタの期間より
も長くかつ１セクタ期間からサーボセクタ期間を引いた
期間よりも短い第２のモノマルチバイブレータを設け、
第１のモノマルチバイブレータと第２のモノマルチバイ
ブレータの出力を用いて廿−ボセクタを検出するもので
ある。In the present invention, the oscillation period is shorter than the period of the servo clock and the erasure section of the ERASE section w! l with retriggerable function that is shorter than J
) A second mono multivibrator is provided which takes the output of the first mono multivibrator and the first mono multivibrator as input, and which is longer than the period of the servo sector between oscillations 11 and shorter than the period obtained by subtracting the servo sector period from one sector period. ,
The output of the first mono-multivibrator and the second mono-multivibrator is used to detect the two-voice sector.

〔発明の効果〕〔Effect of the invention〕

従って、本発明の方式によれば、ＥＲＡＳ　部の消去ル
ト司はサーボクロックの周期の２＠程度あれば良く、Ｐ
Ｏ８ＩＴ、ＴＯＮ都の消去期間にｌ′１目係なく、従来
のＥＲＡＳＥ部より十分短かく設定でき、その分、デー
タ領域を大きくとれる。従ってＰｔ）ＳＩＴＩＯＮンｉ
ｔｓの・１９報４・１曽してもＥｌ（、Ａ、ＳＥＥｌ３
が長く７了ることはなく、またＥＲＡＳＥ部を十分愚か
くできるため、ノイズによるサーボセクタの誤検出も少
くなるという実用上ｔｐ〆めで大きな効果を奏する。Therefore, according to the method of the present invention, the erasing route of the ERAS section only needs to be about 2@ of the period of the servo clock, and P
The erasure period of O8IT and TON can be set to be sufficiently shorter than the conventional ERASE section regardless of l'1, and the data area can be increased accordingly. Therefore, Pt) SITION
ts's 19th report 4 1 Somo El (, A, SEEl3
7 does not end for a long time, and since the ERASE section can be made sufficiently stupid, erroneous detection of servo sectors due to noise is reduced, which is a great practical effect in terms of tp closing.

〔発明の夫施例〕[Example of invention husband]

以下、図面を参照して本発明の一実施例につき１；発明
１−る。Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

第２図に本発明のサーボセクタ検出方式の回路構成を示
す。磁気ヘッド８から読出された信号６ま２値ｆヒ回路
９で２値化されたｉ、リトリガラブル機機能持持第１の
モノマルチバイブレータｌＯに送られる。第３図［ａ）
にこの２値化なれた波形を示す。FIG. 2 shows the circuit configuration of the servo sector detection method of the present invention. The signal 6 read from the magnetic head 8 is binarized by the binary fhi circuit 9, and is sent to the first mono-multivibrator lO having a retriggerable function. Figure 3 [a)
shows this binarized waveform.

す。vinegar.

ここで、データセクタ領域はサーボパターンを書込むと
き、同時にサーボクロックが書込まれる。Here, when a servo pattern is written in the data sector area, a servo clock is written at the same time.

そして、実際のデータはこのＥに重ね書きされる。The actual data is then overwritten on this E.

このとき、サーボクロックの周波数はデータの１ｆと同
程度に選ばれるため、廿−ボクロック同期の２倍以上の
消去部を持つ領域はサーボセクタのみに限られる。At this time, since the frequency of the servo clock is selected to be approximately the same as 1f of the data, the area having an erased portion twice as many times as the frequency of the servo clock is limited to only the servo sector.

ＩＪ　ｌ−ＩＪガラプル機能を持つ喚ｌのモノマルチバ
イブレータ１０の発振期間をサーボクロック同期の２倍
程度に設定しておけば第１のモノマルチバイブレータ１
０の出力波形は第３図（ｂ）の信号波形となる。If you set the oscillation period of the mono multivibrator 10 with the IJ l-IJ null function to about twice the servo clock synchronization, the first mono multivibrator 1
The output waveform of 0 becomes the signal waveform of FIG. 3(b).

すなわちローレベルになる可能性のある領域はサーボセ
クタのみである。そして、１セクタ単位でみると、最初
にローレベルになるのはＥＲ，Ａ３Ｂ部である。そして
、第２のモノマルチバイブレータ１１の発振１ｔ１１間
を１セクタ期１市の半分程度に准んでおくと、第２のモ
ノマルチバイブレータ１１の出力は第３図ｉｃ）のよう
に、ＥＲ，ＡＳ、ｇ部を除くサーボセクタの領域（ます
べで・・イレペルとなる。従って［ｂ）信号とｔｃ）信
号の１倫理和をみれば（ｄｉ倍信号得られ、これ（ばサ
ーボセクタ検出信号である。そして、セクタサーボ方式
では、このサーボセクタ検出信号の立上りを用いて、サ
ーボデコードに必要な信号がすべて作られる。In other words, the only area where the signal may become low level is the servo sector. When looking at each sector, the ER and A3B portions first become low level. Then, if the oscillation interval 1t11 of the second monomultivibrator 11 is set to about half of one sector period, the output of the second monomultivibrator 11 will be ER, AS, as shown in Fig. 3ic). , the area of the servo sector excluding the g part (massive area, etc.). Therefore, if we look at the sum of the [b) signal and the tc) signal, we will obtain a (di times signal), which is the servo sector detection signal. In the sector servo method, all signals necessary for servo decoding are generated using the rising edge of this servo sector detection signal.

次に、データセクタにノイズが混入し、第１のモノマル
チの発振期間よりも長い消去部が生じた場合の対象につ
いて考える。この場合は、第３図のｔｂ）　ｓ＝号はデ
ータセクタの領域でローレベルトするため、（Ｃ）　、
　ｔｄ）信号もその位置でローレベルとなり、サーボセ
クタの検出を誤まる恐れがある。Next, we will consider a case where noise is mixed into the data sector and an erased portion is generated that is longer than the oscillation period of the first monomulti. In this case, since the tb) s= signal in Fig. 3 has a low level in the data sector area, (C),
td) signal also becomes low level at that position, and there is a possibility that the servo sector will be detected incorrectly.

そこで、数回続けてサーボセクタを正常に検出できたら
ＥＲ，ＡＳＥ部付近のみを用い、他の領域はサーボセク
タ検出に使用しない様にする。このようにすれば短いＢ
ＲＡＳＥ部の期間内にノイズが混入しない限り、サーボ
セクタの検出を誤まることはなくなる。Therefore, if a servo sector can be detected successfully several times in a row, only the areas near the ER and ASE areas are used, and other areas are not used for servo sector detection. In this way, the short B
As long as noise does not enter the period of the RASE section, the servo sector will not be detected incorrectly.

Ｅｌｌ、ＡＳＥ部付近だけをサーボセクタ検出に使用す
るｌこは、第１のモノマルチバイブレータの出力と第３
図の（ｅ）信号を発生するパルス回路１５の出力との論
理和をとり、これを第２のモノマルチバイブレータの入
力とすれば簡単に実現できる。The output of the first mono-multivibrator and the third
This can be easily realized by performing a logical OR with the output of the pulse circuit 15 that generates the signal (e) in the figure and inputting this to the second mono-multivibrator.

以上、説明したように、本発明のサーボセクタ検出方式
によれば、ＢＴＬＡＳＥ部の期間はサーボクロック分数
個あれば十分で、ＰＯ８ＩＴＩＯＮ部の数分の１まで短
かくすることができる。例えば、サーボクロックの同期
を０．５バイトポジション部を８バイト（位置情報の間
隔は１バイト）のときＥＢ、ＡＳＥ部は２バイト程度で
済み、従来方式で必要とされた８バイトに比べ大幅に短
くできる。As described above, according to the servo sector detection method of the present invention, the period of the BTLASE section can be shortened to a fraction of the number of servo clocks, and can be shortened to a fraction of the period of the PO8ITION section. For example, when the servo clock synchronization is 0.5 bytes and the position part is 8 bytes (the position information interval is 1 byte), the EB and ASE parts only need about 2 bytes, which is much larger than the 8 bytes required in the conventional method. It can be shortened to .

また、本方式では、サーボセクタの検出がサーボクロッ
ク周期で行われるため、モータの回転変動があっても、
従来方式のようにセクタ観閲の変動が蓄積されることは
ない。従って、セクタ検出にモータ変動をほとんど考慮
する必要がないため、ＢＲＡＳＥ期間を十分に短くする
ことができる。その結果、この期間ζこノイズの入り込
む確率も低くなるため、安定なサーボセクタの検出が可
能となる。In addition, with this method, servo sector detection is performed at the servo clock cycle, so even if there are motor rotation fluctuations,
Unlike the conventional method, fluctuations in sector inspection are not accumulated. Therefore, since there is almost no need to consider motor fluctuations in sector detection, the BRASE period can be made sufficiently short. As a result, the probability of noise entering during this period is also low, making it possible to stably detect servo sectors.

以上、示したように本発明の方式はサーボセクタの領域
を少くすることができ、しかも安価な少量の回路を付加
するだけでサーボセクタを確実に検出できる実用性の高
いものである。As described above, the method of the present invention is highly practical in that it is possible to reduce the area of the servo sector, and it is also possible to reliably detect the servo sector by adding a small amount of inexpensive circuitry.

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

第１図は、ディスク上のデータセクタとサーボセクタの
関係を示す図及びカーボセクタの詳細を示す図、第２図
は本発明の一実施例によるサーボセクタ検出回路の構成
を示す図、第３図は各部の信号波形を示す図である。 １・・・ディスク、２・・・データセクタ、３・・・サ
ーボセクタ、４・・・ＢＲＡＳＥ部、５・・・ＡＧＣ部
、６・・・ＺＯＮＥ部、７−ｐＯ：ｓ＋Ｉ：、Ｉ’ＩＯ
Ｎｇ、、８−１ｍ　％　ヘノ）’、９・・・２値ｆヒ回
路、１０．１１・・・モノマルチバイブレータ。 代理人弁理士　則　近　憲　佑（ほか１名）第　　１　
図FIG. 1 is a diagram showing the relationship between data sectors and servo sectors on a disk, and a diagram showing details of the carb sector, FIG. 2 is a diagram showing the configuration of a servo sector detection circuit according to an embodiment of the present invention, and FIG. 3 is a diagram showing each part. FIG. 1... Disk, 2... Data sector, 3... Servo sector, 4... BRASE section, 5... AGC section, 6... ZONE section, 7-pO:s+I:, I'IO
Ng,, 8-1m% heno)', 9...binary fhi circuit, 10.11...mono multivibrator. Representative Patent Attorney Kensuke Chika (and 1 other person) No. 1
figure

Claims (2)

【特許請求の範囲】[Claims] （１）イレイズ部の間隔がポジション部の位置パターン
の最大間隔よりも短いサーボパターンを記録媒体上に埋
込み形成すると共に２値化回路と２値化回路の出力を入
力とし、発振期間がサーボクロックの周期よりも長くか
つイレイズ部の間隔より短いリトリガラブル機能を持つ
第１のモノマルチと第１のモノマルチの出力を入力とし
、発振期間がサーボセクタの期間よりも長くかつ１セク
タ期間からサーボセクタ期間を引いた期間よりも短い第
２のモノマルチとを設け、前記第１のモノマルチの出力
と前記第２のモノマルチの出力とを用いてサーボセクタ
を検出することを特徴とするサーボセクタ検出方式。(1) A servo pattern in which the interval of the erase part is shorter than the maximum interval of the position pattern of the position part is embedded and formed on the recording medium, and the output of the binarization circuit and the binarization circuit is input, and the oscillation period is the servo clock. The output of the first mono-multi and the first mono-multi which has a retriggerable function that is longer than the period of the period and shorter than the interval of the erase section is input, and the oscillation period is longer than the period of the servo sector and the period of the servo sector is changed from one sector period to the servo sector period. A servo sector detection method, characterized in that a second monomulti is provided whose period is shorter than the subtracted period, and a servo sector is detected using the output of the first monomulti and the output of the second monomulti. （２）第１又は第２のモノマルチの入力として、イレイ
ズ部の近傍のみを利用することを特徴とする特許請求の
範囲第１項記載のサーボセクタ検出方式。(2) The servo sector detection method according to claim 1, wherein only the vicinity of the erase section is used as the input of the first or second monomulti.
JP12918984A 1984-06-25 1984-06-25 Servo sector detecting system Pending JPS619877A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12918984A JPS619877A (en) 1984-06-25 1984-06-25 Servo sector detecting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12918984A JPS619877A (en) 1984-06-25 1984-06-25 Servo sector detecting system

Publications (1)

Publication Number Publication Date
JPS619877A true JPS619877A (en) 1986-01-17

Family

ID=15003341

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12918984A Pending JPS619877A (en) 1984-06-25 1984-06-25 Servo sector detecting system

Country Status (1)

Country Link
JP (1) JPS619877A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63183606A (en) * 1986-09-30 1988-07-29 Toshiba Corp Magnetic disk and magnetic disk device using said magnetic disk

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63183606A (en) * 1986-09-30 1988-07-29 Toshiba Corp Magnetic disk and magnetic disk device using said magnetic disk

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