JPS5922210A - Retrying system of fixed length magnetic disc device - Google Patents

Retrying system of fixed length magnetic disc device

Info

Publication number
JPS5922210A
JPS5922210A JP12990982A JP12990982A JPS5922210A JP S5922210 A JPS5922210 A JP S5922210A JP 12990982 A JP12990982 A JP 12990982A JP 12990982 A JP12990982 A JP 12990982A JP S5922210 A JPS5922210 A JP S5922210A
Authority
JP
Japan
Prior art keywords
data block
data
error
magnetic disc
unit
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
JP12990982A
Other languages
Japanese (ja)
Inventor
Hitoshi Matsushima
松島　等
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP12990982A priority Critical patent/JPS5922210A/en
Publication of JPS5922210A publication Critical patent/JPS5922210A/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
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1816—Testing
    • 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
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1816—Testing
    • G11B2020/183—Testing wherein at least one additional attempt is made to read or write the data when a first attempt is unsuccessful

Abstract

PURPOSE:To perform retrying due to error generation precisely by storing a data block at the time of error generation during the reading of the data block, and at the time of retrying, skipping the data block. CONSTITUTION:A host device 4 controls a magnetic disc controlling device 5 and positions a head to an objective track of a magnetic disc device 8 through an adaptor 7 to read out data in a unit located on the shortest position on the track in which the same data are repeatedly recorded. If an error is generated in a data block, e.g. a data block B shown by 2, in the unit, the magnetic disc controlling device 5 stores the error generated data block B2 in a memory 6 built in the device 5. At the time of retrying after reporting the contents of the error to the host device 4, the head is positioned on a data block B located on the shortest position other than the data block B2 to read out the data again.

Description

【発明の詳細な説明】 （ａ）　　発明の技術分野 木兄１男は繰り返し同一データが記録されている磁気デ
ィスクよりデータの再生を行なう固定長磁気ディスク装
置に係り、特にデータブロックの読出し中にエラーが発
生しりトライを行なう場合の確実なリトライを保証する
固定長磁気ディスク装置のりトライ方式に関する。[Detailed Description of the Invention] (a) Technical Field of the Invention Kazuo Kinie relates to a fixed-length magnetic disk device that reproduces data from a magnetic disk on which the same data is repeatedly recorded, and particularly during reading of data blocks. The present invention relates to a fixed-length magnetic disk device retry method that guarantees reliable retry when an error occurs and a retry is performed.

（ｂ）　　従来技術と問題点 固定長磁気ディスク装置に於てはアクセス時間を短縮ｒ
るため同一トラック上に同一のデータを１ユニツトにま
とめて繰り返し記録し、該ユニットを複数のデータブロ
ックに分割し〔おき、上位装置よりデータの読出し命令
を受けると最もアクセス時間の短い位置にあるユニット
にヘッドを位置付してデータの再生を行・よシ方式を用
いるものがある。(b) Conventional technology and problems In fixed length magnetic disk drives, access time can be shortened.
In order to do this, the same data is repeatedly recorded in one unit on the same track, and the unit is divided into multiple data blocks.When a data read command is received from the host device, the unit is recorded in the position with the shortest access time. Some devices use a read/write method to play back data by positioning the head on the unit.

第１図は上記方式でデータが記録きれているトラックの
一例を示す。■はトランクでＡτＢ、Ｃはデータブロッ
クでめる。本例は１ユニツトをＡ。FIG. 1 shows an example of a track on which data has been completely recorded using the above method. ■ is a trunk, AτB, and C is a data block. In this example, 1 unit is A.

Ｂ、Ｃの３データグロツクで溝底する場合を示Ｊ−。J- shows the bottom of the groove with 3 data blocks B and C.

今２で示すデータブロックＢを、洗出し中エラーが発生
ｒると、従来の固定長磁気ディスク装装置のりトライ方
式は３で示す次のユニットのデータブロックＢが同一の
データであるにも岡４）らず、エラー発生のデータブロ
ック２で続出しを中断した後、該トラックｌの先頭ユニ
ットのデータブロックＢにヘッドをｌ１Ｚｌｆ付してリ
トライするため先頭ユニットで恒久的なエラーが発生す
る時は救済することが出来ない。第２図は従来のりトラ
イ方式を説明ｒるフローチャートである。先ず繰り返し
記録されたデータの１ユニツトを読出す命令を受けると
ヘッドの最短距離にあるユニット（こヘッドを位置付し
読出しを開始する０この場はエラーの発生が無く、１ユ
ニツトのデータブロックずべて読出せば読出し動作児ｒ
となる。若しエラー発生すると該トラックの先頭に必る
ユニットを指示したりトライ命令を要求して、該先頭ユ
ニットのエラー発生データブロックと同一データを記録
しているデータブロックにヘッドの位１沢付をして読出
す。If an error occurs while cleaning the data block B shown in 2, the conventional fixed-length magnetic disk drive retry method will not work even if the data block B of the next unit shown in 3 contains the same data. 4) After interrupting continuous output at data block 2 where an error occurred, a permanent error occurs in the first unit because the head is attached l1Zlf to data block B of the first unit of track l and retried. cannot be rescued. FIG. 2 is a flowchart illustrating the conventional glue try method. First, when receiving a command to read one unit of repeatedly recorded data, the unit closest to the head (this head is positioned and reading starts).At this point, no error occurs and the entire data block of one unit is read. If you read it out, the reading operation child r
becomes. If an error occurs, the system instructs the unit that must be at the beginning of the track or requests a try command, and attaches the head position one mark to the data block that records the same data as the error-occurring data block of the first unit. and read it out.

従って前記の如く先頭のユニットに恒久的なエラーが発
生するといつ迄もリトライが児ｒしないと言う欠点があ
る。Therefore, as mentioned above, there is a drawback that if a permanent error occurs in the first unit, retries will not be repeated.

（ｃ）　　発明の目的 本発明の目的は上記欠点を除くため、或データブロック
を続出し中エラーが発生した場合、該データブロックを
記憶して該データブロックはりトライ時スキップし、且
つエラー発生ブロック以外の同一データが記録されてい
るゲータブロックの中最短距離にあるデータブロックに
へｙｈ−を位置付してｌ）　）ライｒる固定長磁気ディ
スク装置のりトライ方式を提共吏ることにある。(c) Object of the Invention The object of the present invention is to eliminate the above-mentioned drawbacks by storing the data block when an error occurs while successively reading a certain data block, and skipping the data block when retrying the data block. The objective is to provide a fixed-length magnetic disk drive trial method in which yh- is located in the data block located at the shortest distance among the gator blocks in which the same data other than the same data is recorded. .

（ｄ）　　発明の構成 本発明の構成は繰り返し同一データが記録されたａ気デ
ィスクよりデータを再生する固定長磁気ディスク装置に
於Ｃ１或データグ・スックを読出し中エラーが発生しり
トライｒ６場８、該データブロックを記憶してスキップ
するようにしたものである。(d) Structure of the Invention The structure of the present invention is such that when an error occurs while reading C1 or data tag in a fixed-length magnetic disk device that reproduces data from a disk on which the same data is repeatedly recorded, try r6. The data block is stored and skipped.

ｔｅ）発明の実施例 第３図は本発明の適用される磁気ディスクリ°プシステ
ムを示す。上位装置１は磁気ディスクｍｕ　ｉｌｌ装置
５を制御しアダゲタ７を経て磁気ディスク装置８０目的
トラツクにヘッドを位置付し同一データの繰り返し記録
してめるトラックの最短位置にあるユニットのデ・−タ
・を読出づ−８この時ユニット内のデータブロック例え
ば第１図２で示すデータブロックＢでエラーが発生する
と、磁気ディスク制＃装置１５は該装置１りにめるメモ
リ６に工２−発生グータグロックＢ２を記憶する。同時
に磁気ディスク制御装置５はエラー内容を上位装置１に
報告した後リトライを行なうがデータブロックＢ２以外
の最短距離にあるデータブロックＢにヘッドを位置付し
て再度データのｄ出しを行なう０第４図は本発明の一実
施例を説明するフローチャートである。磁気ディスク制
御装置５は繰り返しデータ内の１ユニツトを続出ｆ　７
ｊめり節令を受領ｒると磁気ディスク装置）ｉ８のへラ
ドを最短距離にあるユニットに（１を置付し読出しを開
始する０この時エラーの発生がなくｌユニットのデータ
ブロックｒべてを読出ぜば読出し動作完了となるＯ若し
エラーが発生ｒるとエラーの発生したデータフ゛ロック
からのＩＪ　）ライ命令を要求し、最短距離Ｉこあるユ
ニットの１司−データをｄ記録したデータフ゛ロックに
ヘッドを位置付する。該データブロックの索引番号とメ
モリ６に記録されたエラー発生データブロックの索引番
号と照合しエラー発生データブロックで・’ｘｒｊｎば
読出しを開始し、若しニジー発生データゾロツクであれ
ば該データブロックをスキップして、最短距離に６−る
他のユニットの同一データが自己録しＣあるｆ−タブロ
ックにヘッドを再位置付して読出しを開始する。te) Embodiment of the Invention FIG. 3 shows a magnetic disk clip system to which the present invention is applied. The host device 1 controls the magnetic disk muill device 5, positions the head on the target track of the magnetic disk device 80 via the adapter 7, and repeatedly records the same data. At this time, if an error occurs in the data block in the unit, for example, data block B shown in FIG. Memorize Guta Glock B2. At the same time, the magnetic disk control device 5 reports the error details to the host device 1 and then retries, but positions the head in the data block B that is the shortest distance apart from the data block B2 and outputs the data again. The figure is a flowchart illustrating one embodiment of the present invention. The magnetic disk control device 5 repeatedly outputs one unit in the data f7
When the command is received, the magnetic disk drive (magnetic disk drive) places the disk drive of the i8 on the unit closest to it (1) and starts reading. If an error occurs, the read operation is completed.If an error occurs, a write command is requested from the data block in which the error occurred, and the data recorded by the first controller of the unit with the shortest distance I is sent. Position the head on the block. Compare the index number of the data block with the index number of the error data block recorded in the memory 6, and if it is an error data block, start reading, and if it is a error data block, skip the data block. Then, the head is repositioned to the f-ta block where the same data of another unit located at the shortest distance is self-recorded, and reading is started.

（ｆ）　　発明の効果 以上説夕Ｊした如く本発明は繰り返し同一データが記録
された磁気ディスクからデータの続出しを行な′）４合
、エラー発生によるリトライが確実に一実施し得るため
、その効果は大・するものがある０(f) Effects of the Invention As described above, the present invention allows data to be repeatedly output from a magnetic disk on which the same data has been repeatedly recorded. The effect is great/there is something to be done

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

第１図は繰り返し同一データの６己録されたトラックの
一例・２示ず図、第２図は従来のりトライ方式を説明す
るフローチャート、第３図は本発明の適用される磁気デ
ィスクサブシステムを示す図、第４図は本発明の一実施
例と説明するフローチャートでおる。ｌはトラック、４
は上位装置、５は飾気ディスク制御装置、６はメモ１ハ
　７はアダプタ、８は飾気ディスク装置である０ ；１７５図 オ′４　図Fig. 1 shows an example of six tracks on which the same data is repeatedly recorded. Fig. 2 is a flowchart explaining the conventional paste try method. Fig. 3 shows a magnetic disk subsystem to which the present invention is applied. The figure shown in FIG. 4 is a flowchart explaining one embodiment of the present invention. l is track, 4
is the host device, 5 is the decorative disk control device, 6 is the memo 1c, 7 is the adapter, and 8 is the decorative disk device.

Claims (1)

【特許請求の範囲】[Claims] 繰り返し同一データが記録された磁気ディスクよりデー
タを再生する固定長磁気ディスク装置に於て、或データ
ブロックを読出し中エラーが発生しりトライｒる揚げ、
該データブロックを記憶してスキップすることを特徴と
する固定長磁気ディスク装置のりトライ方式。In a fixed-length magnetic disk device that reproduces data from a magnetic disk on which the same data has been repeatedly recorded, an error occurs while reading a certain data block and a trial is attempted.
A fixed-length magnetic disk device storage trial method characterized by storing and skipping the data block.
JP12990982A 1982-07-26 1982-07-26 Retrying system of fixed length magnetic disc device Pending JPS5922210A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12990982A JPS5922210A (en) 1982-07-26 1982-07-26 Retrying system of fixed length magnetic disc device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12990982A JPS5922210A (en) 1982-07-26 1982-07-26 Retrying system of fixed length magnetic disc device

Publications (1)

Publication Number Publication Date
JPS5922210A true JPS5922210A (en) 1984-02-04

Family

ID=15021385

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12990982A Pending JPS5922210A (en) 1982-07-26 1982-07-26 Retrying system of fixed length magnetic disc device

Country Status (1)

Country Link
JP (1) JPS5922210A (en)

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