JPS61105707A - Magnetic tape storage device - Google Patents

Magnetic tape storage device

Info

Publication number
JPS61105707A
JPS61105707A JP22733784A JP22733784A JPS61105707A JP S61105707 A JPS61105707 A JP S61105707A JP 22733784 A JP22733784 A JP 22733784A JP 22733784 A JP22733784 A JP 22733784A JP S61105707 A JPS61105707 A JP S61105707A
Authority
JP
Japan
Prior art keywords
magnetic tape
rewrite
counter
circuit
storage device
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
JP22733784A
Other languages
Japanese (ja)
Inventor
Shinji Imai
今井 伸二
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP22733784A priority Critical patent/JPS61105707A/en
Publication of JPS61105707A publication Critical patent/JPS61105707A/en
Pending legal-status Critical Current

Links

Landscapes

  • Digital Magnetic Recording (AREA)

Abstract

PURPOSE:To reduce the number of rewrites b giving a rewrite start command after the erase operation is performed by an extent of running in the reverse direction at the rewrite time and avoiding a defective area of a magnetic tape with one rewrite operation. CONSTITUTION:If an error is detected at the data recording time, a gate of a counter circuit 11 is opened by a reverse running signal B issued from a control circuit 13, and the counter 11 is counted up by an output pulse A of a rotary encoder 10. Next, the tape is run forward by a rewrite instruction C, and the counter 11 is counter down by the pulse A; and when the counted value becomes zero, the completion of erase operation is found by a signal E, and rewrite is performed by a recording head. Thus, data is erased for the extent of reverse running before rewrite to avoid the defective area of the magnetic tape with one rewrite operation, thereby reducing the number of rewrites.

Description

【発明の詳細な説明】 本発明は、情報処理装置の外部記憶装置と(2て使用さ
れる磁気テープ記憶装置に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an external storage device and a magnetic tape storage device used in an information processing device.

この種の磁気テープ記憶装置における磁気テープへの情
報の記録は1通常ブロックと称される一群のデータを単
位と1〜で行われる。従来、このような磁気テープ記憶
装置において、磁気テープにデータを記録j〜でいる時
にエラーが発生した場合は、磁気テープを逆方向に走行
させてそのエラーを含むブロックの手前迄戻した後一定
距離の消去動作を行い、その後再びデータを記録しなお
す。
In this type of magnetic tape storage device, information is recorded on the magnetic tape in units of a group of data, usually called a block. Conventionally, in such magnetic tape storage devices, if an error occurs while recording data on the magnetic tape, the magnetic tape is run in the opposite direction to a point before the block containing the error, and then Perform an operation to erase the distance, and then record the data again.

従来のこのような磁気テープ記憶装置においては上記消
去動作によって消去される磁気テープ上の、距離はあら
かじめ定められた一定の長さ−である1゜一般にデータ
記録時のエラーは磁気テープ媒体の欠陥に起因する場合
が多く、磁気テープ上の同じ位置に再書き込みを行って
もエラーが発生する可、能性が大きい。このため1ブロ
ツクの−長さが前記消去距離よりも長い場合は再書き込
みを何度も繰り返す必要が有り1、書込みが成功する迄
長い時間を要するという場合があった。
In such a conventional magnetic tape storage device, the distance on the magnetic tape that is erased by the above-mentioned erasing operation is a predetermined constant length.Generally, errors during data recording are caused by defects in the magnetic tape medium. This is often caused by errors, and there is a high probability that an error will occur even if the same location on the magnetic tape is rewritten. For this reason, if the length of one block is longer than the erase distance, it is necessary to repeat rewriting many times1, and it may take a long time until the writing is successful.

本発明は、前述の如き消去動作の際に、書込みエラーの
生じたブロック長に相当する距離を消去することにより
一度の再書込み動作で磁気テープの欠陥領域を避けるこ
とを保障し、これによって再書込み回数を減することの
でき不色気テープ記憶装置を提供するも、のである。
The present invention guarantees that a defective area of the magnetic tape is avoided in a single rewriting operation by erasing a distance corresponding to the block length in which a writing error occurred during the above-mentioned erasing operation, thereby ensuring that a defective area of the magnetic tape is avoided in one rewriting operation. This also provides a colorless tape storage device that can reduce the number of writes.

これを実現するため本発明では、書込みエラー発生後の
再書込み処理において、逆方向、に走行1〜だ距離即ち
エラーを含むデータブロックの長さに対応する値を計数
するカウンタ回路を設け、再書込み時にその距離分だけ
消去動作を行った後書込みを開始−するように制御□を
行うものである。  ′次に、本発明の実施例について
図面を参照して説明する。
To achieve this, the present invention provides a counter circuit that counts a value corresponding to the distance traveled in the reverse direction, that is, the length of the data block containing the error, in the rewrite process after a write error occurs. At the time of writing, control □ is performed so that writing is started after performing an erasing operation for that distance. 'Next, embodiments of the present invention will be described with reference to the drawings.

図面は本発明の実施例に係る磁気テープ記憶装置の概略
図である。本発明の実施例は、供給り一ル11巻取りリ
ール2.磁気テープ3.消去ヘッド4.記録ヘッド5.
再生ヘッド6、消去ヘッドの電流を駆動する消去回路7
.記録情報に応じて配録ヘッドの電流を駆動するための
記録回路8゜再生ヘッドの出力から情報を復元する再生
回路9゜磁気テープの走行とともに回転【−でパルス信
号を発生するロータリーエンコーダ10.ロータリーエ
ンコータのパルスを計数するカウンタ回路11゜カウン
タ回路の出力て接続されたアンド回路12゜これら全体
を制御する制御回路13を含んで構成される。
The drawing is a schematic diagram of a magnetic tape storage device according to an embodiment of the present invention. An embodiment of the invention includes a supply reel 11 a take-up reel 2. Magnetic tape 3. Erase head 4. Recording head5.
An erasing circuit 7 that drives the current of the reproducing head 6 and the erasing head.
.. 8. A recording circuit for driving the current of the recording head in accordance with the recorded information; 9. A reproduction circuit for restoring information from the output of the reproduction head; 9. A rotary encoder that generates a pulse signal at [-] which rotates as the magnetic tape runs. The circuit includes a counter circuit 11 for counting the pulses of the rotary encoder, an AND circuit 12 connected to the output of the counter circuit, and a control circuit 13 for controlling all of these.

書込み命令実行時には、供給リール1および巻取pリー
ル2が回転して磁気テープ3を矢印方向−に駆動し、消
去ヘッド4で磁気テープ上の旧データを消去し、記録ヘ
ッド5でデータを磁気テープに記録する。この時記録さ
れたデータを再生ヘッド6で再生し再生回路9で情報に
復元し正常に記録されているか否かが検査される。磁気
テープへの情報の配路は、ブロックと呼ばれる1群のデ
ータを単位として行なわれ、ブロックとブロックの間は
インタブロックギャップで区切られている。
When a write command is executed, the supply reel 1 and the take-up reel 2 rotate to drive the magnetic tape 3 in the direction of the arrow -, the erase head 4 erases old data on the magnetic tape, and the recording head 5 magnetically erases the data. Record on tape. The data recorded at this time is reproduced by the reproduction head 6 and restored to information by the reproduction circuit 9, and it is checked whether or not it has been recorded normally. Information is routed to the magnetic tape in units of groups of data called blocks, and blocks are separated by interblock gaps.

いま、データ記録時に再生情報に誤りが検出された場合
、制御回路は磁気テープを逆方向に走行させる指令を発
1〜、エラーを含むブロックの手前まで磁気テープを戻
す。この逆方向走行信号Bによってカウンタ回路11の
ゲートを開き、ロータリーエンコーダの出力パルスAで
カウンタ11の加算動作を行う。従って逆方向走行が終
了した時点でカウンタ11には逆方向に走行した距離が
保持されていることになる。次に再書込み命令が与えら
れ制御回路13から書込み命令信号Cが与えられると、
消去ヘッド4と記録ヘッド5に電流を流して磁気テープ
を順方向に走行させる。この時日一タリーエンコーダ1
0の出力パルスAでカウンタ11を減算し、カウンタが
0になった時カウンタ出力りと書込み命令信号の論理積
がアンド回路12’によ″つてとられ、その出力Eが制
御回路13に送られる。制御回路はこの信号Eにより消
去動作が完了したことを知り書込みデータを送り、配録
回路8によって記録ヘッド5を駆動しデータの再書込み
を行う。なお本実施例では距離の検出に・ ロータリー
エンコータを使用しているが5時間を計数することも勿
論可能である。
If an error is detected in the reproduced information during data recording, the control circuit issues a command to run the magnetic tape in the opposite direction, and returns the magnetic tape to the position before the block containing the error. This reverse running signal B opens the gate of the counter circuit 11, and the output pulse A of the rotary encoder causes the counter 11 to perform an addition operation. Therefore, when the reverse direction travel is completed, the counter 11 stores the distance traveled in the reverse direction. Next, when a rewrite command is given and a write command signal C is given from the control circuit 13,
A current is applied to the erasing head 4 and the recording head 5 to run the magnetic tape in the forward direction. At this time, daily tally encoder 1
The counter 11 is subtracted by the output pulse A of 0, and when the counter reaches 0, the logical product of the counter output and the write command signal is taken by the AND circuit 12', and the output E is sent to the control circuit 13. The control circuit learns from this signal E that the erasing operation has been completed, and sends the write data, and the recording circuit 8 drives the recording head 5 to rewrite the data. Although a rotary encoder is used, it is of course possible to count 5 hours.

以上説明したように本発明は、再書込み時の前の逆方向
走行距離分を消去することにより、一度の再書゛込み動
作で磁気テープ媒体の欠陥領域を避けることができ、再
書込み回数を減する効果がある。  ゛
As explained above, the present invention makes it possible to avoid defective areas on the magnetic tape medium with a single rewriting operation by erasing the distance traveled in the backward direction before rewriting, thereby reducing the number of rewriting operations. It has the effect of reducing゛

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

図面は本発明の一実施例を部分的に示した概略図でおる
。  ′            1・・ン供給リール
、    2・・・巻取りリール、3・・・磁気テープ
上    4・・・消去ヘッド、5・・・記録ヘッド、
    6゛°再生6ツド・7・・・消去回路、   
  8・・・記録回路、9・・・再生回路、   10
・・・ロータリーエンコーダ、11・・・カウンタ回路
、  12・・・アンド回路、13−制゛御回路、 A・・・ロータリーエンコーダの出力パルス信号、B・
・・逆方向走行信号、 C・・・書込み命令信号、 D・・・カウンタ出力信号。 E・・・アンド回路出力信号。
The drawings are schematic diagrams partially showing one embodiment of the present invention. ' 1... Supply reel, 2... Take-up reel, 3... On magnetic tape, 4... Erasing head, 5... Recording head,
6゛° playback 6th/7... erasure circuit,
8... Recording circuit, 9... Playback circuit, 10
... Rotary encoder, 11 - Counter circuit, 12 - AND circuit, 13 - Control circuit, A - Output pulse signal of rotary encoder, B.
...Reverse direction running signal, C...Write command signal, D...Counter output signal. E...AND circuit output signal.

Claims (1)

【特許請求の範囲】[Claims] 書込みエラー発生後再書込み処理を行う磁気テープ記憶
装置において、逆方向に走行した距離に対応する値を計
数するカウンタ回路と、再書込み時にその距離分だけ消
去動作を行つた後再書込みの開始指令を与える制御装置
とを有することを特徴とする磁気テープ記憶装置。
In a magnetic tape storage device that performs rewriting processing after a writing error occurs, there is a counter circuit that counts the value corresponding to the distance traveled in the opposite direction, and a command to start rewriting after performing an erase operation for that distance during rewriting. A magnetic tape storage device characterized in that it has a control device that provides.
JP22733784A 1984-10-29 1984-10-29 Magnetic tape storage device Pending JPS61105707A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22733784A JPS61105707A (en) 1984-10-29 1984-10-29 Magnetic tape storage device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22733784A JPS61105707A (en) 1984-10-29 1984-10-29 Magnetic tape storage device

Publications (1)

Publication Number Publication Date
JPS61105707A true JPS61105707A (en) 1986-05-23

Family

ID=16859225

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22733784A Pending JPS61105707A (en) 1984-10-29 1984-10-29 Magnetic tape storage device

Country Status (1)

Country Link
JP (1) JPS61105707A (en)

Similar Documents

Publication Publication Date Title
US4500965A (en) Capstanless magnetic tape drive with electronic equivalent to length of tape
US5953177A (en) Write splicing for helical scan recorder
JPH08501168A (en) Data recording system having a single end-of-record and start-of-record format indicator
EP0572711B1 (en) Method and system for detecting and correcting errors on a tape in a tape drive system
JPH0546001B2 (en)
JPS61105707A (en) Magnetic tape storage device
US6222693B1 (en) Re-recording/re-producing device for magnetic tape and head cleaning
US5287229A (en) Method of avoiding accidental overwriting on magnetic tape
JPH0626964Y2 (en) Magnetic tape device
JPS59146466A (en) Magnetic tape recorder
JPS6034164B2 (en) Magnetic recording medium erasing method
JPH04159645A (en) Retrieving method for end mark of data recorder, and recording and erasing method for mark for end mark warning
JPS6173279A (en) Block controlling system
JP3116745B2 (en) Magnetic recording / reproducing device
JPS5939305Y2 (en) information recording device
JPS645364B2 (en)
JPS6243259B2 (en)
JPS6240781B2 (en)
JPS5944692B2 (en) Abnormal data erasing device for magnetic tape storage devices
JPH10247302A (en) Magnetic recording and reproducing device
JPH04360001A (en) Erase method and device for helical scan recording
JPH01282709A (en) Magnetic tape device
JPH0746405B2 (en) Disk drive device
JPH04168609A (en) Magnetic tape device
JPH0156463B2 (en)