JPS6358675A - Data recording system - Google Patents

Abstract

PURPOSE:To prevent the breakdown of the old information data by recording the information data only in case the data pattern of each bit of the optional data is equal to a recorded one when the recorded optional data is reproduced. CONSTITUTION:A recording area for optional data FF having a fixed data pattern of each bit is secured adjacently to the recording area for information data for the recording channel of a magnetic card. Then the data FF is recorded by a magnetic head while this head moves to a return position 4 after the end of reproduction of the information data from a time point when the reproduction and collation are through with the information data. When the recording job is through with the data FF and the head arrives at the position 4, the data FF is reproduced while the head is reset to its home position 3. Then this reproduced data is processed if it is decided that the prescribed optional data is recorded. The new information data is recorded after the information processing is over. Thus it is possible to decide whether the information data can be recorded normally or not. Then the breakdown of the information data can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention mainly relates to a recording method for recording data on a card-shaped recording medium.

Conventional technology Card-shaped recording media, such as magnetic cards, conventionally store data using F 2 F (frequency and t
It is an abbreviation for wo-frequency and is hereinafter referred to as F2F.

) method, and the data is played back and recorded by relative movement between the magnetic card and the magnetic head, and when rewriting the data, the entire area of the recording channel is encoded to maintain the continuity of the F2F code. The F2F method includes a data signal and a clock signal in the same channel, and if there is a magnetization reversal in the center of a bit cell, which is a unit recording area, 1
'', otherwise it is 0#, and magnetization reversal always occurs at the boundary of each bit cell, which is a clock signal.

Problems to be Solved by the Invention However, with the above-mentioned recording method, when rewriting data, the magnetic head may be worn out, dirty, dusty, etc. Since this cannot be determined before recording, the data is recorded, destroying the F2F code that was normally recorded over the entire area of the recording channel, and potentially making the old data unplayable.

In view of the above-mentioned problems, the present invention provides a data recording method that prohibits the recording of information data if the magnetic head is unable to perform normal recording, thereby at least preventing the destruction of old information data. It is.

Means for Solving the Problems In order to solve the above problems, the data recording method of the present invention records arbitrary data with a constant data pattern for each bit in a predetermined area outside the information data recording area in the recording channel. After recording, when the recorded arbitrary data is reproduced by reverse scanning of the recording channel, information data is recorded only if the data pattern of each bit of the arbitrary data is the same as the recorded one.

Operation When rewriting data with the above-described configuration, the present invention writes arbitrary data with a constant data pattern of each bit in a predetermined area outside the information data recording area before recording data in all areas of the recording channel. If the data pattern of each bit is the same, information data will be recorded, but if the data pattern of each bit is not the same, it will be determined that normal recording is not possible and the data will be rewritten. This can at least prevent the destruction of old information data.

EXAMPLE Hereinafter, a data recording system according to an example of the present invention will be explained with reference to the drawings.

FIG. 1 is a plan view for explaining the operation of the system of the present invention in the case of a magnetic card of the magnetic head moving system.

In the figure, 1 is a magnetic card, 21-j is a magnetic stripe for data recording, 3f''i is a magnetic head for recording and reproducing at the home position, and 4 is the position of the magnetic head at a return position.Head In the moving method, the magnetic head starts recording and reproducing data at the home position and ends at the return position.Furthermore, when returning to the home position, the magnetic head starts recording and reproducing data from the return position and returns to the home position. It is also possible to end in position.

Figure 2 shows the magnetic recording contents of the recording channel after the recording of information data is completed. 3 is the home position of the magnetic head, 4
is the return position. The recording data area is 11
It consists of 9 bytes of information data and 2 bytes of arbitrary data. The information data consists of 1 byte of start code, 1 byte of stop code, and 7 bytes of data.

The -tocord is located on the home position side 3 of the magnetic head. Further, the content of the arbitrary data is assumed to be φφH.

FIG. 3 shows the magnetically recorded contents of the recording channel after recording of arbitrary data is completed. In this embodiment, arbitrary data is FFH ('1') where each bit has a constant data pattern.
) and record it in the arbitrary data recording area as shown in the figure.

FIG. 4 is a data flow diagram in an embodiment of the present invention. A solid line bus indicates a data flow during recording, and a dotted line bus indicates a data flow during playback.

Explaining FIG. 4, 5 is an information data processing unit that processes reproduced information data and generates new information data;
Corresponds to applicable equipment. Reference numeral 6 denotes an information data checking section that determines whether the reproduced information data is data recorded in a predetermined format.

7 is an arbitrary data generating section which generates arbitrary data FFH. Reference numeral 8 denotes an arbitrary data checking section which determines whether the reproduced arbitrary data is predetermined data.

Reference numeral 9 denotes a recorded data reproducing unit 10, in which data is recorded and reproduced via a magnetic head 11 serving as a recording and reproducing means. The 12-digit control unit performs processing such as input/output processing of information data and arbitrary data and switching between recording and reproduction.

An example of the operation of this data recording system having the above configuration will be described with reference to the flowchart of FIG. 5 and FIGS. 2 and 3. In FIG. 5, first, it is determined whether a magnetic card has been inserted (step 101), and if it has been inserted, the magnetic head is moved from the home position controller 3 and reproduction of information data is started (step 1o2). The contents of the data recorded on the magnetic card are as shown in FIG. 2, and the data is reproduced in order starting from the start code. At the same time, it is determined whether the reproduced data is recorded in a predetermined format or not in step 1o3.
), if it is recorded in the specified format, step 1
If the magnetic card is not recorded in a predetermined format, the inserted magnetic card is considered to be a fake card or a card with corrupted data, and the process proceeds to step 04, where the magnetic card is returned. In step 104, it is determined whether the reproduction of the 9-byte information data has been completed. If the reproduction has been completed, the process advances to step 106; if not, the process returns to step 102 and continues the reproduction of the information data. In step 105, after the reproduction of the information data is finished, the magnetic head moving to the return position 4 starts recording arbitrary data (FF) in the arbitrary data recording area. When the recording of the arbitrary data is completed and the magnetic head reaches the return position 4, the arbitrary data is reproduced in the process of returning to the home position 3 (step 1o6).

The contents of the data recorded on the magnetic card at this time are as shown in Figure 3, and the contents of the arbitrary data recording area are FF.
It has changed to H. However, since the arbitrary data is recorded from the middle of the data group represented by the F2F code, which maintains continuity, the continuity of the F2F code is lost when recording the arbitrary data starts. However, if data is also reproduced at return position 4, the data up to the recording start point of arbitrary data can be normally reproduced. Therefore, between steps, 2 bytes of arbitrary data are reproduced, and if the bit content is "1" for 8 or more consecutive bits, it is determined that the predetermined arbitrary data is recorded, and the process proceeds to step 108; If not, it will be determined that normal recording is not possible and the card will be returned to Stellaf 11. In this case, the F2F code of the information data has not lost its continuity and can be used again. In step 108, the reproduced information data is processed by the applicable device to generate new information data. When the information processing is completed, the process advances to step 108 and recording of new information data is started.

At this time, the magnetic head has already returned to the home position, and new information data is recorded from this position. Then, arbitrary data φφH is recorded in the arbitrary data recording area (step 110). When data recording is completed, the magnetic card is returned (step 111).

The above is an example of the operation of this data recording method.

As described above, according to this embodiment, a recording area for arbitrary data (FFH) in which the data pattern of each bit is constant is provided next to the recording area for information data in the recording channel of the magnetic card, and reproduction and verification of the information data is completed. Arbitrary data (FFH) is recorded from the point in time, and after the recording of the arbitrary data is completed, the arbitrary data is reproduced and checked during the return process of the magnetic head to the home position to determine whether normal recording is possible. If this is not possible, the magnetic card can be returned without destroying the information data on the magnetic card. In addition, since the arbitrary data is set as FFH (a sequence of "1"s) with a constant data pattern of each bit, even if the recorded arbitrary data is played back from the opposite direction during the return process of the magnetic head to the home position, each Since the data pattern of the bits is the same as the data pattern when it was recorded, it is possible to record and reproduce any data and compare it while the magnetic head makes one round trip through the recording channel, making it possible to quickly determine whether or not normal recording is possible. . In addition, 1. If another magnetic card is inserted by mistake, the information data is first reproduced and checked, and the magnetic card is determined to be another magnetic card and the magnetic card is returned. Therefore, arbitrary data is recorded on the other magnetic card. It is possible to prevent information data from being destroyed. Moreover, if it is adopted in a system using a high coercive force card, it is possible to prevent fraud using a counterfeit card with a low coercive force card.

Although this embodiment describes a magnetic head moving method, it goes without saying that the same effect can be obtained with a magnetic card moving method.

Effects of the Invention As described above, this data recording method records arbitrary data with a constant data pattern for each bit in a predetermined area outside the information data recording area in the recording channel, and after recording is completed, recording When reproducing recorded arbitrary data by reverse scanning the channel, if the data pattern of each bit of the arbitrary data is the same as the recorded one, normal recording is possible.Usually, it is determined that recording is not possible, and the information data is recorded. This can at least prevent the destruction of old information data. In addition, since the data pattern of each bit of arbitrary data is fixed, even if the recorded arbitrary data is played back from the opposite direction, the data pattern of each bit will be the same as the one recorded, so it will not be necessary to stop recording the arbitrary data. Since arbitrary data can be reproduced and verified during the process of returning to the initial position by reverse scanning of the post-recording channel, it can be quickly determined whether or not normal recording is possible.

[Brief explanation of drawings]

Figure 1 is a plan view for explaining the case where the present invention is applied to a magnetic card, Figure 2 is a chart showing the magnetic recording contents of the recording channel after recording of information data, and Figure 3 is recording of arbitrary data. FIG. 4 is a chart showing the magnetic recording contents of the recording channel after completion of recording, FIG. 4 is a data flow chart in the embodiment of the present invention, and FIG. 5 is a flow chart showing the operation in the embodiment of the present invention. 11... Recording and reproducing means (magnetic head). Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 4

Claims (1)

[Claims] When recording information data on a predetermined recording channel of a recording medium via a recording means, recording arbitrary data with a constant data pattern of each bit in a predetermined area outside the recording area of the information data in the recording channel, After recording is finished,
A data recording method for recording information data only when the data pattern of each bit of the arbitrary data is the same as that recorded when the recorded arbitrary data is reproduced by a reproducing means by reverse scanning of the recording channel.