JPH10320930A - Data recording method, data reproducing method, data recording device and data reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the forgery of a recording medium completely and improve the security by a method wherein a plurality of gaps are formed and recorded respectively between a plurality of block data and gap data are formed so as to correspond to a plurality of formats and, on the other hand, the data of the respective blocks are recorded with formats corresponding to the gap data immediately before the respective blocks. SOLUTION: Gap parts with predetermined lengths are formed respectively between a plurality of block data and a plurality of ECC data blocks on a magnetic card. In the respective gap parts, sink data which are changed in accordance with formats of the block data immediately after the respective gap parts are recorded. Further, the data of a plurality of respective blocks are set with a plurality of different formats respectively. When the data are reproduced, in accordance with the bit number of the gap data, the format of the data of the block immediately after the gap part is made to agree with the format at the time of recording and a modulation/demodulation circuit corresponding to the data of the gap part immediately before the block is selected and the data are demodulated to obtain the original data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a data recording method and apparatus for recording data on a recording medium such as a magnetic card, a data reproducing method for reproducing data from a recording medium such as a magnetic card, and a data reproducing method. Related to the device.

[0002]

2. Description of the Related Art Conventionally, a data recording apparatus for recording data on a recording medium such as a magnetic card divides the data into a plurality of blocks to prevent erroneous reading and forgery of the recording medium such as a magnetic card. A certain gap data is inserted between each data of the block and is recorded on a magnetic track of a recording medium such as a magnetic card in a certain format.
The gap data is usually data in which “1” is continuous.

A data reproducing apparatus for reproducing data from a recording medium such as a magnetic card reads data from a magnetic track of a recording medium such as a magnetic card with a magnetic head, and reads data of each block from the magnetic head based on the data. CRC
Specific calculations such as C and ECC are performed, and erroneous reading or authenticity of a recording medium such as a magnetic card is determined from the calculation results.

[0004]

The above data reproducing apparatus uses a CRC based on data of each block from a magnetic head.
C and ECC, etc. are performed to determine erroneous reading or authenticity of a recording medium such as a magnetic card based on the calculation result. However, calculation methods such as CRCC and ECC prevent erroneous reading of a recording medium such as a magnetic card. When the calculation formula is understood, forgery of a recording medium such as a magnetic card becomes possible, and forgery of a recording medium such as a magnetic card cannot be prevented.

In the above data writing apparatus, the gap data to be inserted between the data of each block is continuous data of "1". However, the gap data has no meaning in the contents and is wastefully magnetic. I use trucks. The present invention relates to a data recording method and a data reproducing method that can reliably prevent forgery of a recording medium such as a magnetic card by using gap data and improve security of a recording medium such as a magnetic card. It is an object of the present invention to provide a data recording device and a data reproducing device.

[0006]

In order to achieve the above object, the invention according to claim 1 divides data into a plurality of blocks and forms a gap portion of a predetermined length between each of the data of the plurality of blocks. A data recording method for recording the data of the plurality of blocks on a recording medium in a predetermined format, wherein the predetermined format is a plurality of formats and a plurality of gaps formed between each of the data of the plurality of blocks; Create multiple gap data corresponding to the multiple formats as part data,
While recording the plurality of gap data on a recording medium,
The data of the plurality of blocks is recorded on a recording medium in a format corresponding to the immediately preceding gap data, and forgery of a recording medium such as a magnetic card using the gap data can be reliably prevented. Security of a recording medium such as a magnetic card can be improved.

According to a second aspect of the present invention, the data is divided into a plurality of blocks and recorded, and the data of the immediately succeeding block is used as data of a gap provided between each of the plurality of blocks. In a data reproducing method for reproducing data from a recording medium on which gap data indicating a format is recorded, a method of storing a relationship between the gap data and the format of the data and reproducing the data read from the recording medium Based on the above relationship, the selection is made in accordance with the gap data read from the recording medium, and forgery of a recording medium such as a magnetic card can be reliably prevented by using the gap data, and the magnetic card and the like can be prevented. Security of the recording medium can be improved.

According to a third aspect of the present invention, the data is divided into a plurality of blocks, a gap of a predetermined length is formed between each of the data of the plurality of blocks, and the data of the plurality of blocks is recorded in a predetermined format. In a data recording apparatus for recording data on a medium, a plurality of gap data corresponding to a plurality of formats are created as data of a plurality of gap portions formed between the data of the plurality of blocks, and data of the plurality of blocks are created. Recording data generating means for converting the data into a format corresponding to the immediately preceding gap data, and recording a plurality of gap data and a plurality of blocks of data generated by the recording data generating means on a recording medium. Things,
Using the gap data, forgery of a recording medium such as a magnetic card can be reliably prevented, and security of the recording medium such as a magnetic card can be improved.

According to a fourth aspect of the present invention, the data is divided into a plurality of blocks and recorded, and the data of the immediately succeeding block is used as the data of the gap provided between the data of the plurality of blocks. In a data reproducing apparatus for reproducing data from a recording medium on which gap data indicating a format is recorded, storage means for storing a relationship between the gap data and the format of the data, and data read from the recording medium. A plurality of reproducing means for reproducing data by different reproducing methods, and a selecting means for selecting data read from the recording medium based on the relationship and according to gap data read from the recording medium. And use of gap data to reliably prevent forgery of recording media such as magnetic cards. It is possible to improve the security of the recording medium such as a magnetic card can.

According to a fifth aspect of the present invention, in the data recording method according to the first aspect, the gap data includes:
It is characterized by continuous data of "1" or "0" and different numbers of bits, and can reliably prevent forgery of a recording medium such as a magnetic card using gap data. Thus, the security of a recording medium such as a magnetic card can be improved.

According to a sixth aspect of the present invention, in the data reproducing method according to the second aspect, the gap data is
It is characterized by continuous data of "1" or "0" and different numbers of bits, and can reliably prevent forgery of a recording medium such as a magnetic card using gap data. Thus, the security of a recording medium such as a magnetic card can be improved.

According to a seventh aspect of the present invention, in the data recording apparatus according to the third aspect, the gap data is
It is characterized by continuous data of "1" or "0" and different numbers of bits, and reliably prevents forgery of a recording medium such as a magnetic card using gap data. It is possible to improve the security of a recording medium such as a magnetic card.

The invention according to claim 8 is the data reproducing apparatus according to claim 4, wherein the gap data is:
It is characterized by continuous data of "1" or "0" and different numbers of bits, and reliably prevents forgery of a recording medium such as a magnetic card using gap data. It is possible to improve the security of a recording medium such as a magnetic card.

[0014] The invention according to claim 9 is the invention according to claim 1 or 5.
In the data recording method described above, the recording medium is a magnetic card, and forgery of the magnetic card can be reliably prevented by using the gap data, and the security of the magnetic card can be improved. .

According to a tenth aspect of the present invention, in the data reproducing method according to the second or sixth aspect, the recording medium is a magnetic card, and the forgery of the magnetic card is ensured by utilizing gap data. Thus, the security of the magnetic card can be improved.

According to an eleventh aspect of the present invention, in the data recording apparatus according to the third or seventh aspect, the recording medium is a magnetic card. Forgery can be reliably prevented, and the security of the magnetic card can be improved.

According to a twelfth aspect of the present invention, in the data reproducing apparatus according to the fourth or eighth aspect, the recording medium is a magnetic card. Forgery can be reliably prevented, and the security of the magnetic card can be improved.

[0018]

FIG. 1 shows an embodiment of the present invention, and FIG. 2 shows a processing flow of a microcomputer (CPU) as control means in this embodiment. This embodiment is an embodiment of a data recording / reproducing apparatus to which the invention according to claims 1 to 12 is applied, and when used as a recording apparatus, transports a magnetic recording medium 11 composed of a magnetic card as shown in FIG. The preamble, the data and the postamble are sequentially written on the magnetic track 1 of the magnetic card 11 by the magnetic head 12 while running in the forward direction by the system, and at the same time, the preamble, data and post Write ambles sequentially.

When this embodiment is used as a reproducing apparatus, the preamble, data and postamble are sequentially transmitted from the magnetic track 1 of the magnetic card 11 by the magnetic head 12 while the magnetic card 11 is traveling in the forward direction by the transport system. At the same time as reading, the preamble, data and postamble are sequentially read from the magnetic track 0 of the magnetic card 11 by the magnetic head 12.

First, when recording data on the magnetic card 11, the CPU 13 creates data in a data format as shown in FIG. ECC data is added after the data, and a preamble and a postamble are added before and after the data.
Data is divided into a plurality of blocks, for example, five blocks, and ECC data is divided into a plurality of blocks, for example, four blocks.

Further, these nine blocks of data (5
A gap portion having a predetermined length is formed between each of the block data and the four blocks of ECC data. The data of the plurality of gap portions includes gap data in which “1” is continuous and “gap data” added before and after the gap data. 1011 "data," 1
This is sync data made up of data 1101 ", and the number of bits is changed by the CPU 13 for each gap portion according to the format of the data of the block immediately after it.
The gap data is data in which “1” is continuous.
"0" may be continuous data. When the gap data is a mixture of "1" and "0", it is difficult to distinguish the data. However, if the data is distinguished, the data may be a mixture of "1" and "0". The preamble is 60-bit data composed of continuous data of “1” and the sync data of “11101” appended thereto. The postamble is 60-bit data composed of data in which "1" s are continuous and sync data of "10111" attached in front of the data.

In this embodiment, nine blocks of data are recorded and reproduced in a plurality of formats on the magnetic card 11, and the format of the data in each block is not the same format but a plurality of different formats (modulation schemes). , Bit interval, data and code conversion). The format of the data in each block is, for example, the modulation method is F2F, F3
Some are different from F, NRZI, and MFM.

The modulation / demodulation circuits 15 to 18 modulate the data of each block, respectively, to perform F2F, F3F, NRZI, M
Modulation means for FM format, and F2F, F3
It also serves as a demodulating means for demodulating data of each format of F, NRZI, and MFM. As shown in FIG. 3, the memory 14 as a storage means includes modulation / demodulation circuits 15 to 18 corresponding to the data format of each block, the number of bits of gap data immediately before the data of each block, and the number of bits of data of each block. A list showing the relationship with A to D is stored. The CPU 13 basically sets the format of the data of each block to a format predetermined by a list in the memory 14, but is instructed from outside to change to a format different from the basic format by an instruction means. As a result, the list in the memory 14 is changed, and the data format of each block is changed to the format specified by the instruction means.

The CPU 13 refers to the list in the memory 14 and sets the timer 19 for determining the bit interval of each data to the interval corresponding to the data format of each block. The data of each block is sent to the modulation / demodulation circuits 15 to 18 while controlling so that the preamble before and after the data, the data of each gap portion and the postamble are sent to the magnetic head 12 via the selector 20. The modulation / demodulation circuits 15 to 18 respectively perform F2F, F3F, NRZI, and MFM modulation on the data of each block from the CPU 13 in synchronization with the clock CLK from the timer 19. The data of each block from the modulation / demodulation circuits 15 to 18 is supplied to any one of
One is selected and sent to the magnetic head 12 for recording.

The CPU 13 refers to the list in the memory 14 and instructs the selector 20 to send the data from each of the modulation / demodulation circuits 15 to 18 to the selector 20 so that the data of each block has a format corresponding to the bit number of the immediately preceding gap data. The user is caused to select one of the data of the block. Magnetic head 1
Reference numeral 2 writes and records the preamble, data, and postamble from the selector 20 on the magnetic tracks 0 and 1 of the magnetic card 11 that is driven to travel in the forward direction by the transport system.

When reproducing data from the magnetic card 11, the magnetic head 12 reads the preamble, the data and the postamble from the magnetic tracks 0 and 1 of the magnetic card 11 which are driven in the forward direction by the transport system. A preamble read by the magnetic head 12,
Of the data and the postamble, the preamble, the data of each gap portion and the postamble are sent to the CPU 13 via the selector 20, and the data of each block read by the magnetic head 12 are sent to the modulation / demodulation circuits 15 to 18.

The CPU 13 counts the number of bits of the gap data from the selector 20 and refers to the list in the memory 14 according to the number of bits of the gap data to determine the number of bits of the data of the block immediately after the gap data from the selector 20. The timer 19 is controlled so that the interval corresponds to the format of the data of each block, that is, one of a plurality of tables in the list in the memory 14 is determined, and the data of this table is read. The selector 20
The timer 19 is controlled so that the bit interval of the data of the block immediately after the gap data from the block becomes the interval corresponding to the data format of each block.

Further, based on the data of the table obtained by referring to the list in the memory 14 by the gap data from the selector 20, the CPU 13 makes the data of each block correspond to the number of bits of the immediately preceding gap data. The selector 20 selects one of the modulation / demodulation circuits 15 to 18 so that the data is demodulated by the modulation / demodulation circuit (modulation / demodulation circuit corresponding to the data format of each block). Therefore, the data of each block read by the magnetic head 12 is demodulated by a modulation / demodulation circuit corresponding to the format, becomes original data, and is sent to the CPU 13. Here, the actual data on the magnetic track of the magnetic card and the gap data are converted by a table as shown in FIG. 6, for example, and the actual data on the magnetic track of the magnetic card is the gap data (data of the data table).
Code A, code B, code C in the code table
Is used.

Conventionally, an apparatus for recording and reproducing data on and from a recording medium such as a magnetic card records on a magnetic track of a recording medium such as a magnetic card in a fixed format (recording method, data bit interval). Because it was
A magnetic card for recording data by changing the data format of the block immediately following it according to the number of bits of the gap data as in the present embodiment cannot record and reproduce data with a conventional device, and assures forgery of the magnetic card. And the security of the magnetic card can be improved.

As described above, this embodiment is an embodiment of the first aspect of the present invention, in which data is divided into a plurality of blocks and a gap of a predetermined length is provided between each of the data of the plurality of blocks. A magnetic card 11 as a recording medium which is formed and stores the data of the plurality of blocks in a predetermined format.
In the method of recording data to be recorded in a plurality of formats, the predetermined format is a plurality of formats, and a plurality of gaps corresponding to the plurality of formats are used as data of a plurality of gap portions formed between the data of the plurality of blocks. Data is created and the plurality of gap data are recorded on the recording medium 11, while the data of the plurality of blocks are respectively recorded on the recording medium 11 in a format corresponding to the immediately preceding gap data. Forgery of the recording medium can be reliably prevented, and the security of the recording medium can be improved.

This embodiment is an embodiment of the second aspect of the present invention, in which data is divided into a plurality of blocks and recorded, and provided between each of the data of the plurality of blocks. Magnetic card 11 as a recording medium in which gap data indicating the format of the data of the block immediately after is recorded as the data of the gap part obtained.
In the data reproducing method of reproducing data from the storage medium, a relationship between the gap data and the format of the data is stored, and a method of reproducing data read from the recording medium 11 is performed based on the relationship. Since the selection is made according to the read gap data, forgery of the recording medium can be reliably prevented by using the gap data, and the security of the recording medium can be improved.

This embodiment is an embodiment of the third aspect of the present invention, in which data is divided into a plurality of blocks and a gap of a predetermined length is formed between each of the data of the plurality of blocks. In a data recording apparatus for recording the data of the plurality of blocks in a predetermined format on a magnetic card 11 as a recording medium, the data of the plurality of gaps formed between the data of the plurality of blocks may be in a plurality of formats. A plurality of gap data corresponding to the above, and the CPU 13, the memory 14, and the modulation / demodulation circuits 15 to 15, in which the data of the plurality of blocks are set to data of a format corresponding to the immediately preceding gap data.
A recording data generating means comprising a recording data generating means 18 and a selector 20 is provided. The data of a plurality of gap data and a plurality of blocks generated by the recording data generating means are recorded on the recording medium 11, so that the recording medium is forged using the gap data. Can be reliably prevented, and the security of the recording medium can be improved.

This embodiment is an embodiment of the invention according to claim 4, wherein data is divided into a plurality of blocks and recorded, and data is provided between each of the plurality of blocks. Magnetic card 11 as a recording medium in which gap data indicating the format of the data of the block immediately after is recorded as the data of the gap part obtained.
In a data reproducing apparatus for reproducing data from a memory, a memory 14 as storage means for storing a relationship between the gap data and the format of the data, and data read from the recording medium 11 are reproduced by different reproducing methods. A reproducing means comprising a plurality of modulation / demodulation circuits 15 to 18; and a selector 20 as a selecting means for selecting data read from the recording medium 11 in accordance with the gap data read from the recording medium 11 based on the relationship.
Therefore, forgery of the recording medium can be reliably prevented by using the gap data, and the security of the recording medium can be improved.

This embodiment is an embodiment of the invention according to claim 5, and in the data recording method according to claim 1, in the gap data, "1" or "0" continues. Since the data is different in the number of bits, forgery of the recording medium can be reliably prevented by using the gap data, and the security of the recording medium can be improved.

This embodiment is an embodiment of the invention according to claim 6, and in the data reproducing method according to claim 2, in the gap data, "1" or "0" is continuous. Since the data is different in the number of bits, forgery of the recording medium can be reliably prevented by using the gap data, and the security of the recording medium can be improved.

This embodiment is an embodiment of the invention according to claim 7, and in the data recording apparatus according to claim 3, in the gap data, "1" or "0" is continuous. Since the data is different in the number of bits, forgery of the recording medium can be reliably prevented by using the gap data, and the security of the recording medium can be improved.

This embodiment is an embodiment of the invention according to claim 8, and in the data reproducing apparatus according to claim 4, the gap data is a sequence of "1" or "0". Since the data is different in the number of bits, forgery of the recording medium can be reliably prevented by using the gap data, and the security of the recording medium can be improved.

This embodiment is an embodiment of the ninth aspect of the present invention. In the data recording method according to the first or fifth aspect, since the recording medium 11 is a magnetic card, the gap data By using this, forgery of the magnetic card can be reliably prevented, and the security of the magnetic card can be improved.

This embodiment is an embodiment of the invention according to claim 10, and in the data reproducing method according to claim 2 or claim 6, since the recording medium 11 is a magnetic card, By using this, forgery of the magnetic card can be reliably prevented, and the security of the magnetic card can be improved.

This embodiment is an embodiment of the invention according to claim 11, and in the data recording apparatus according to claim 3 or 7, wherein the recording medium 11 is a magnetic card. By using this, forgery of the magnetic card can be reliably prevented, and the security of the magnetic card can be improved.

This embodiment is an embodiment of the invention according to claim 12, and in the data reproducing apparatus according to claim 4 or 8, wherein the recording medium 11 is a magnetic card. By using this, forgery of the magnetic card can be reliably prevented, and the security of the magnetic card can be improved. The present invention is not limited to the above embodiment, and can be applied to, for example, a recording medium other than a magnetic card.

[0042]

As described above, according to the first aspect of the present invention, data is divided into a plurality of blocks, and a gap of a predetermined length is formed between each of the data of the plurality of blocks. In a data recording method for recording data of a predetermined format on a recording medium, the predetermined format is a plurality of formats, and the data of the plurality of gaps formed between the data of the plurality of blocks is Since a plurality of gap data corresponding to a plurality of formats are created and the plurality of gap data are recorded on a recording medium, the data of the plurality of blocks are respectively recorded on the recording medium in a format corresponding to the immediately preceding gap data. By using gap data, it is possible to reliably prevent recording media such as magnetic cards from forgery. It is possible to improve the security of the recording medium, such as over de.

According to the second aspect of the present invention, the data is divided into a plurality of blocks and recorded, and the data of the immediately succeeding block is provided as the data of the gap provided between the data of the plurality of blocks. In a data reproducing method for reproducing data from a recording medium on which gap data indicating a data format is recorded, a relationship between the gap data and the data format is stored, and the data read from the recording medium is reproduced. Method is selected based on the gap data read from the recording medium based on the above relationship, so that forgery of a recording medium such as a magnetic card using the gap data can be reliably prevented, and the The security of the recording medium can be improved.

According to the third aspect of the present invention, the data is divided into a plurality of blocks, a gap of a predetermined length is formed between each of the data of the plurality of blocks, and the data of the plurality of blocks is converted into a predetermined format. In the data recording apparatus for recording on a recording medium, a plurality of gap data corresponding to a plurality of formats is created as data of a plurality of gap portions formed between the data of the plurality of blocks, and the plurality of blocks are created. Is provided with recording data creating means for converting the data of each format into data corresponding to the immediately preceding gap data, and the plurality of gap data and the data of the plurality of blocks created by the recording data creating means are recorded on a recording medium. Data can be used to reliably prevent recording media such as magnetic cards from being counterfeited. It is possible to improve the security of the recording medium such as a card.

According to the fourth aspect of the present invention, the data is divided into a plurality of blocks and recorded, and the data of the immediately succeeding block is used as the data of the gap provided between the data of the plurality of blocks. In a data reproducing apparatus for reproducing data from a recording medium on which gap data indicating a data format is recorded, storage means for storing a relationship between the gap data and the format of the data are read from a recording medium. A plurality of reproducing means for reproducing data by different reproducing methods, and the data read from the recording medium based on the relationship,
Selection means for selecting according to the gap data read from the recording medium, it is possible to reliably prevent forgery of a recording medium such as a magnetic card using the gap data, and Security can be improved.

According to a fifth aspect of the present invention, in the data recording method according to the first aspect, the gap data is data in which "1" or "0" is continuous.
Since the number of bits is different, forgery of a recording medium such as a magnetic card can be reliably prevented by using gap data, and security of a recording medium such as a magnetic card can be improved.

According to a sixth aspect of the present invention, in the data reproducing method according to the second aspect, the gap data is data in which "1" or "0" is continuous.
Since the number of bits is different, forgery of a recording medium such as a magnetic card can be reliably prevented by using gap data, and security of a recording medium such as a magnetic card can be improved.

According to a seventh aspect of the present invention, in the data recording apparatus according to the third aspect, the gap data is data in which "1" or "0" is continuous.
Since the number of bits is different, forgery of a recording medium such as a magnetic card can be reliably prevented by using gap data, and security of a recording medium such as a magnetic card can be improved.

According to the eighth aspect of the present invention, in the data reproducing apparatus according to the fourth aspect, the gap data is data in which "1" or "0" is continuous,
Since the number of bits is different, forgery of a recording medium such as a magnetic card can be reliably prevented by using gap data, and security of a recording medium such as a magnetic card can be improved.

According to the ninth aspect of the present invention, in the data recording method according to the first or fifth aspect, since the recording medium is a magnetic card, forgery of the magnetic card is reliably prevented by using gap data. This can improve the security of the magnetic card.

According to the tenth aspect, the second aspect is provided.
In the data reproducing method described in Item 6, since the recording medium is a magnetic card, forgery of the magnetic card can be reliably prevented by using the gap data, and the security of the magnetic card can be improved.

According to the eleventh aspect, the third aspect is provided.
In the data recording device according to Item 7, since the recording medium is a magnetic card, forgery of the magnetic card can be reliably prevented by using gap data, and security of the magnetic card can be improved.

According to the twelfth aspect, the fourth aspect is provided.
In the data reproducing apparatus described in Item 8, since the recording medium is a magnetic card, forgery of the magnetic card can be reliably prevented by using the gap data, and the security of the magnetic card can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing flow of a CPU in the embodiment.

FIG. 3 is a diagram illustrating a relationship between a modulation / demodulation circuit corresponding to a data format of each block, a number of bits of gap data immediately before data of each block, and a number of bits of data of each block in the memory according to the embodiment. It is a figure showing the list shown.

FIG. 4 is a diagram showing a data format of the embodiment.

FIG. 5 is a plan view showing the magnetic card of the embodiment.

FIG. 6 is a diagram showing an example of a conversion table for converting actual data and gap data on a magnetic track of the magnetic card of the embodiment.

[Explanation of symbols]

 Reference Signs List 11 magnetic card 12 magnetic head 13 CPU 14 memory 15-18 modulation / demodulation circuit 19 timer 20 selector

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[Procedure amendment]

[Submission date] March 12, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

A data reproducing apparatus for reproducing data from a recording medium such as a magnetic card reads data from a magnetic track of a recording medium such as a magnetic card with a magnetic head, and reads data of each block from the magnetic head , CRCC ( Tour
Redundancy check code), ECC (error correction code), etc.
Calculation of a specific redundancy check is performed, and erroneous reading or authenticity of a recording medium such as a magnetic card is determined from the calculation result.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

[0004]

The above data reproducing apparatus uses a CRC based on data of each block from a magnetic head.
C and ECC are performed to determine misreading or authenticity of a recording medium such as a magnetic card from the calculation result. However, the calculation method of the redundancy check such as CRCC and ECC is based on a recording medium such as a magnetic card. The main purpose of this method is to prevent the misreading of a recording medium. If the calculation formula is understood, forgery of a recording medium such as a magnetic card becomes possible, and forgery of a recording medium such as a magnetic card cannot be prevented.

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

Claims (12)

[Claims] The data is divided into a plurality of blocks, a gap of a predetermined length is formed between the data of the plurality of blocks, and the data of the plurality of blocks is recorded on a recording medium in a predetermined format. In the recording method, the predetermined format is a plurality of formats, and a plurality of gap data corresponding to the plurality of formats is created as data of a plurality of gap portions formed between the data of the plurality of blocks, A method for recording data, comprising recording the plurality of gap data on a recording medium and recording the data of the plurality of blocks on the recording medium in a format corresponding to the immediately preceding gap data. 2. Data is recorded divided into a plurality of blocks, and gap data indicating a format of data of a block immediately after is recorded as data of a gap portion provided between each of the plurality of blocks of data. In a data reproducing method for reproducing data from a recorded recording medium, a relationship between the gap data and the data format is stored, and a method for reproducing data read from the recording medium is performed based on the relationship. A data reproducing method, wherein the selection is made in accordance with gap data read from a recording medium. 3. The data is divided into a plurality of blocks, a gap having a predetermined length is formed between each of the data of the plurality of blocks, and the data of the plurality of blocks is recorded on a recording medium in a predetermined format. In the recording apparatus, a plurality of gap data corresponding to a plurality of formats are created as a plurality of gap data formed between each of the plurality of blocks of data, and the plurality of blocks of data are respectively stored in the immediately preceding gap data. A recording apparatus for recording data, comprising recording data generating means for converting data in a format corresponding to the above, and recording a plurality of gap data and a plurality of blocks of data generated by the recording data generating means on a recording medium. 4. Data is divided into a plurality of blocks and recorded, and gap data indicating a format of data of a block immediately after is provided as data of a gap portion provided between each of the plurality of blocks of data. In a data reproducing apparatus for reproducing data from a recorded recording medium, a storage means for storing a relationship between the gap data and the format of the data, and reproducing data read from the recording medium by different reproducing methods. A data reproducing apparatus, comprising: a plurality of reproducing means for performing the operation; and a selecting means for selecting data read from the recording medium in accordance with the gap data read from the recording medium based on the relationship. 5. The data recording method according to claim 1, wherein the gap data is data in which "1" or "0" is continuous and has different bit numbers. Recording method. 6. A data reproducing method according to claim 2, wherein said gap data is data in which "1" or "0" is continuous and has different bit numbers. How to play. 7. The data recording apparatus according to claim 3, wherein the gap data is data in which "1" or "0" is continuous and the number of bits is different. Recording device. 8. The data reproducing apparatus according to claim 4, wherein said gap data is data in which "1" or "0" is continuous and has different bit numbers. Playback device. 9. The data recording method according to claim 1, wherein said recording medium is a magnetic card. 10. The data reproducing method according to claim 2, wherein said recording medium is a magnetic card. 11. A data recording apparatus according to claim 3, wherein said recording medium is a magnetic card. 12. A data reproducing apparatus according to claim 4, wherein said recording medium is a magnetic card.