JPS63140461A - Exchange type medium recording system - Google Patents

Exchange type medium recording system

Info

Publication number
JPS63140461A
JPS63140461A JP28818186A JP28818186A JPS63140461A JP S63140461 A JPS63140461 A JP S63140461A JP 28818186 A JP28818186 A JP 28818186A JP 28818186 A JP28818186 A JP 28818186A JP S63140461 A JPS63140461 A JP S63140461A
Authority
JP
Japan
Prior art keywords
information
check code
data
recording
sector
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
JP28818186A
Other languages
Japanese (ja)
Inventor
Masaru Matsuo
優 松尾
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 JP28818186A priority Critical patent/JPS63140461A/en
Publication of JPS63140461A publication Critical patent/JPS63140461A/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
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • 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
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00572—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium
    • G11B20/00579—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the data encoding, e.g., modulation schemes violating run-length constraints, causing excessive DC content, or involving uncommon codewords or sync patterns

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

PURPOSE:To prevent the illegal use of information by adding a particular check code to recording a bit of information and recording the information including its sector. CONSTITUTION:When a bit of information is recorded, its recording area is discriminated by discrimination code data ID and write the information in data field DF and the recording takes place with a sector to be added with the particular check code CRC-D and a sector to be added with a usual check code. For the usual check code in case of the floppy disk, data generated from generation polynomial F(X)=X<16>+X<12>+X<5>+1 which is used for IBM format, etc. is used, while for the particular data code; such data as generated from generation polynomial other than the above-mentioned format is used. Consequently, the illegal use of the recording information can be prevented.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は交換形の記録媒体に情報を記録する交換形媒体
記録方式に関し、特に、その記録情報の不正使用を防止
できるように改良した交換形媒体記録方式に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a removable medium recording system for recording information on a removable recording medium, and in particular, to a removable medium recording system that is improved to prevent unauthorized use of the recorded information. Concerning media recording methods.

〔従来の技術〕[Conventional technology]

従来の交換形媒体記録方式における記録情報は、情報の
記録エリアの識別コードデータと、情報の記録ミス又は
読み出しミスをチェックするチェックコードと、情報と
により構成され、識別コードデータにより目的の情報を
選択して読み出し、チェックコードにより読み出した情
報が正しいことを確認していた。Recorded information in conventional removable media recording systems is composed of identification code data for the information recording area, a check code for checking information recording errors or reading errors, and information.The identification code data is used to identify the target information. They selected and read out the information, and used a check code to confirm that the read information was correct.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

交換形の記録媒体に情報のチェックコードを付加して情
報を記録する従来の方式では、記録媒体の交換性を保持
するために同一形式の情報のチェックコードを使用する
ことになっているので、記録媒体に書き込まれた情報を
簡単に読み出して他の記録媒体にコピーすることができ
る。このため交換形記録媒体に書き込んだ情報を簡単に
不正使用することができるという欠点がある。In the conventional method of recording information by adding an information check code to a removable recording medium, the same format of information check code is used to maintain the interchangeability of the recording medium. Information written on a recording medium can be easily read and copied to another recording medium. Therefore, there is a drawback that information written on the removable recording medium can be easily used illegally.

〔問題点を解決するための手段〕[Means for solving problems]

本発明の交換形媒体記録方式は、記録データ、およびこ
の記録データの記録エリアを識別するための識別コード
データを含む記録情報にチェックコードを付加して情報
を記録する交換形媒体記録方式において、前記チェック
コードの生成式と異なる生成式による別のチェックコー
ドを付加して情報を記録することを特徴とするものであ
る。The removable medium recording method of the present invention is a removable medium recording method in which information is recorded by adding a check code to recorded data and recorded information including identification code data for identifying the recording area of this recorded data. The present invention is characterized in that information is recorded by adding another check code based on a generation formula different from the generation formula of the check code.

〔実施例〕〔Example〕

次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

第１図は本発明の一実施例のブロック図である。１は通
常のチェックコードを発生するＣＲＣ生成回路、２は特
殊なチェックコードを生成するＣＲＣ−Ｄ生成回路、３
は回路１および回路２で生成されたチェックコードを選
択する選択回路、４は書き込みデータでＣＲＣ生成回路
１およびＣＲＣ−Ｄ生成回路２に入力される６５は選択
回路３を制御するチェックコード選択信号、６は選択回
路３により選択されたチェックコードデータである。FIG. 1 is a block diagram of one embodiment of the present invention. 1 is a CRC generation circuit that generates a normal check code; 2 is a CRC-D generation circuit that generates a special check code; 3
4 is a selection circuit that selects the check codes generated by circuits 1 and 2; 4 is write data that is input to the CRC generation circuit 1 and CRC-D generation circuit 2; 65 is a check code selection signal that controls the selection circuit 3; , 6 are check code data selected by the selection circuit 3.

第２図は本発明の一実施例におけるセクターフォーマッ
ト図である。ＩＤは記録情報の記録エリアの識別コード
データ、データフィルドＦＤ（Ｄａｔａ　Ｆｉｅｌｄ）
は記録情報の記録エリア、ＣＲＣは識別コードデータの
チェックコード、ＣＲＣ−Ｄは記録情報の特殊チェック
コードである。また、Ｇ１は各セクターの最初のギャッ
プ部、Ｇ２は識別コードデータＩＤと記録エリアＤＦを
分離するギャップ部、Ｇ３は次のセクターとのギャップ
部である。FIG. 2 is a sector format diagram in one embodiment of the present invention. ID is identification code data of recording area of recorded information, data field FD (Data Field)
is a recording area of recorded information, CRC is a check code of identification code data, and CRC-D is a special check code of recorded information. Further, G1 is the first gap part of each sector, G2 is the gap part separating the identification code data ID and recording area DF, and G3 is the gap part with the next sector.

情報を記録する場合、識別コードデータＩＤにより記録
エリアを識別し、データフィールドＦＤに情報を書き込
み、特殊チェックコードＣＲＣ−Ｄを付加するセクター
と通常のチェックコードを付加するセクターとにより行
う。通常のチェックコードとしてはフロッピィディスク
の場合ＩＢＭフォーマット等で使用される生成多項式Ｆ
　（Ｘ）＝ｘ′６＋ｘ１２＋ｘ’　十ｉにより生成した
データを使用し、特殊データコードとしては上記の生成
多項式以外の生成多項式又は形式により生成したデータ
を使用する。When recording information, the recording area is identified using the identification code data ID, and the information is written in the data field FD using sectors to which a special check code CRC-D is added and sectors to which a normal check code is added. For floppy disks, the usual check code is the generator polynomial F used in IBM format etc.
(X)=x'6+x12+x' Data generated by i is used, and data generated by a generator polynomial or format other than the above generator polynomial is used as the special data code.

第１図に示すように、書き込みデータ４を通常のチェッ
クコードを生成するＣＲＣ生成回路と特殊チェックコー
ドＣＲＣ−Ｄを生成するＣＲＣ−Ｄ生成回路２に入力し
、チェックコード選択信号５により選択回路３を駆動し
、通常のチェックコードと特殊チェックコードのいずれ
か一方を選択してチェックコードデータ６とする。As shown in FIG. 1, write data 4 is input to a CRC generation circuit that generates a normal check code and a CRC-D generation circuit 2 that generates a special check code CRC-D. 3 to select either the normal check code or the special check code and set it as check code data 6.

このようにして情報を記録した交換形記録媒体を通常の
チェックコードを生成するＣＲＣ生成回路を持つシステ
ムにより読み出した場合、特殊チェックコードを付加し
たセクターでエラーが発生する。このエラーが発生する
セクター位置を示す情報を、記録する情報に加えて書き
込み、読み出し時にエラーが発生したセクター位置が記
録情報内のエラーが発生するセクター位置を示す情報と
一致した場合に正常に記録情報を読み出したことにする
。この交換形記録媒体の情報を前記の通常のチェックコ
ードを生成するＣ　ＲＣ生成回路を持つシステムでコピ
ーした場合、通常のチェックコードが付加されて書き込
まれるため読み出しな時にエラーが発生するセクター位
置を示す情報で示されるセクター位置でエラーが発生し
なくなる。When a removable recording medium on which information is recorded in this manner is read by a system having a CRC generation circuit that generates a normal check code, an error occurs in the sector to which the special check code is added. Information indicating the sector position where this error occurs is written in addition to the information to be recorded, and if the sector position where the error occurs during reading matches the information indicating the sector position where the error occurs in the recorded information, the recording is successful. Assume that the information has been read. When the information on this removable recording medium is copied by a system that has a CRC generation circuit that generates the normal check code mentioned above, the normal check code is added and written, so the sector position where an error occurs when reading is The error no longer occurs at the sector position indicated by the information shown.

このような場合記録情報が正常に読み出すことができな
かったことにする。In such a case, it is assumed that the recorded information could not be read normally.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、記録情報に特殊チェック
コードを付加してセクターを含めた情報の記録をするこ
とにより、通常のシステムでは情報のコピーができなく
なり、情報の不正使用の防止をすることができる効果が
ある。As explained above, the present invention adds a special check code to recorded information and records information including sectors, thereby making it impossible to copy the information in a normal system and preventing unauthorized use of the information. There is an effect that can be done.

【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ブロック図、第２図は第１
図におけるセクターのフォーマツ１〜を示す構成図であ
る。 Ｇ１・・・各セクターの最初のギャップ部、Ｇ２・・・
識別コードデータＩＤと記録エリアＤＦを分離するギャ
ップ部、Ｇ３・・・次のセクターとのギャップ部、ＩＤ
・・・識別コードデータ、ＤＦ・・・記録データを書き
込む記録エリア、ＣＲＣ・・チェックコー■・、ＣＲＣ
−Ｄ・・・特殊チェックコード、１・・・ＣＲＣ発生回
路、２・・・ＣＲＣ−Ｄ発生回路、３・・・選択回路、
４・・・書き込みデータ、５・・・チェックコード選択
信号、６・・・チェックコードデータ。 第１０ ４−一一鼻き送ン１１″−タ 汐−−−チェッフコーｉ主（千にう Ｊ−一一子ヱツ７コードデブFIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
It is a block diagram which shows format 1 of the sector in a figure. G1...first gap part of each sector, G2...
Gap part separating identification code data ID and recording area DF, G3...Gap part with next sector, ID
...Identification code data, DF...Recording area where recorded data is written, CRC...Check code, CRC
-D... Special check code, 1... CRC generation circuit, 2... CRC-D generation circuit, 3... Selection circuit,
4...Write data, 5...Check code selection signal, 6...Check code data. 10th 4-11 Nose Send 11''-Tashio--Chefko I Lord (1000 J-11 Koetsu 7 Code Fat

Claims (1)

【特許請求の範囲】[Claims] 記録データ、およびこの記録データの記録エリアを識別
するための識別コードデータを含む記録情報にチェック
コードを付加して情報を記録する交換形媒体記録方式に
おいて、前記チェックコードの生成式と異なる生成式に
よる別のチェックコードを付加して情報を記録すること
を特徴とする交換形媒体記録方式。In a removable medium recording method for recording information by adding a check code to recorded data and recorded information including identification code data for identifying a recording area of this recorded data, a generation formula different from the check code generation formula described above. A removable medium recording method characterized by recording information by adding another check code.
JP28818186A 1986-12-02 1986-12-02 Exchange type medium recording system Pending JPS63140461A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28818186A JPS63140461A (en) 1986-12-02 1986-12-02 Exchange type medium recording system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28818186A JPS63140461A (en) 1986-12-02 1986-12-02 Exchange type medium recording system

Publications (1)

Publication Number Publication Date
JPS63140461A true JPS63140461A (en) 1988-06-13

Family

ID=17726857

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28818186A Pending JPS63140461A (en) 1986-12-02 1986-12-02 Exchange type medium recording system

Country Status (1)

Country Link
JP (1) JPS63140461A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000072322A1 (en) * 1999-05-20 2000-11-30 Hitachi Maxell Limited Removable memory and removable memory drive
EP1477982A1 (en) * 2002-02-20 2004-11-17 Sony Corporation Data recording medium, data recording method and apparatus, data reproducing method and apparatus, data transmitting method, and data receiving method
JP2007102846A (en) * 2005-09-30 2007-04-19 Sony Corp Disk recording medium and its manufacturing method, disk recording method and device, and disk playing method and device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000072322A1 (en) * 1999-05-20 2000-11-30 Hitachi Maxell Limited Removable memory and removable memory drive
EP1477982A1 (en) * 2002-02-20 2004-11-17 Sony Corporation Data recording medium, data recording method and apparatus, data reproducing method and apparatus, data transmitting method, and data receiving method
US7274642B2 (en) 2002-02-20 2007-09-25 Sony Corporation Data recording medium, data recording method and apparatus, data reproducing method and apparatus, data transmitting method, and data receiving method
EP1477982A4 (en) * 2002-02-20 2007-11-21 Sony Corp Data recording medium, data recording method and apparatus, data reproducing method and apparatus, data transmitting method, and data receiving method
JP2007102846A (en) * 2005-09-30 2007-04-19 Sony Corp Disk recording medium and its manufacturing method, disk recording method and device, and disk playing method and device
US8305856B2 (en) 2005-09-30 2012-11-06 Sony Corporation Disk-shaped record medium and producing method for same, disk recording method and device, and disk playback method and device

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