JPH10289558A - System for reading and writing data of magnetic card used for 3.5 inch floppy disk drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic card allowing to use a 3.5 inch floppy disk drive equipped on a personal computer as a standard and an adapter for using the card. SOLUTION: A whole back side area of a card of a fibered base material like plastics or paper, etc., is coated with a magnetic substance equivalent to a HD type floppy disk as a recording medium. And, a magnetic card Z is set into a slit 9 from an intake of an adapter Y, and the adapter Y is inserted in s slot X of a floppy disk drive, and in such procedures in handling a conventional floppy disk, it becomes possible to receive and transmit information data stored in the magnetic card. Since a magnetic card is easily and personally usable if a personal computer is only available, for example, if it is made use of for name cards, it is possible to substantially save a handling time and avoid errors in character input at a time of making a database, and further, the magnetic card can become a new means for information exchange exceeding a restriction of space.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a card adapter and a magnetic card dedicated to the adapter, which enable a 3.5-inch floppy disk drive to write and read data on a magnetic card. .

[0002]

2. Description of the Related Art Various types of business cards, such as business cards, membership cards, ID cards, etc., have a basic size such as name, address, telephone number, etc. printed on the surface of the card. Depending on the purpose of the card, necessary information is further described. Especially for cards such as business cards, whose main role is to transmit and introduce their information to others, address documents, telephone calls, and other communication materials or databases are created based on the information described. It is also an essential material such as. In recent years, personal computers have tended to be used for the above purposes for business cards that have been accumulated in large quantities. In order to input information, in addition to a keyboard, printed character information can be read using an optical character reading device. And the like, but all are limited to perceived written information. Depending on the type of card such as ID card, from the viewpoint of security and privacy,
In some cases, electronic and electromagnetic methods of providing a card with a barcode or a magnetic recording medium or the like make intentional perception impossible. Japanese Patent Application Laid-Open No. 5-41733 discloses a "telephone with a card reader". The present invention is a system that mainly eliminates the error-prone dialing operation by hand using a card such as a business card having a bar code or a magnetic band and a telephone with a dedicated card reader.

[0003]

[Problems to be solved by the invention] Currently, business cards, membership cards,
Various types of business cards, such as ID cards, have been widely used, but have the following limitations and problems. (A) The business card size is appropriate for handling, but printable characters, images, and the like are limited in terms of space, and are not sufficient as an information transmission function. (B) Using a personal computer from the received business card, create a database such as an address book or a directory,
When printing addresses such as New Year's cards and various greeting cards, keyboard input work is required. Performing this task manually requires a lot of trouble, even for those who are used to the operation.
Input errors are not uncommon. Even for beginners unfamiliar with the operation, it often becomes rather inefficient because of the inconvenience of the operation before taking advantage of the computer. (C) In the case of the same purpose as in (b), the input method may be a method using an optical character reader instead of using a keyboard. However, the information to be read is limited to characters and some images described on the card. As a result, while the complexity of key input is relieved, the burden of purchasing new equipment and the like, the connection of cables, and the burden of setting software are imposed. Regarding the above-mentioned problems (a), (b) and (c), general solutions premised on using a personal computer for organizing business cards and other cards and for various uses are as follows. Conventionally, the information on the printed portion on the card, which was input by the person who received the card such as a business card, is now electronically and electromagnetically provided by the person who passes the card such as a business card. In this case, the information is recorded on a recording medium by an optical method or the like in advance. A person who receives a card such as a business card equipped with a recording medium inputs data to a personal computer used by the user using a reading device and an interface device corresponding to the recorded method.
According to the above solution, it is possible to store a large number of characters which could not be described very much with the conventional card size, and it is possible to avoid erroneous operations and complexity related to keyboard input. Further, depending on the capacity of the recording medium, it is possible to store information requiring a relatively high capacity, such as images and sounds. However, the solutions shown in the above (a), (b), and (c) cause the following new problems. (D) Cards equipped with recording media such as magnetic cards, IC cards, cards with barcodes, and other electronic media, electromagnetic methods, optical methods, etc., which already exist, are compatible with each type. Interface devices such as a reading device and a writing device are required. For this reason, when using or creating a card equipped with a recording medium, a dedicated read / write device is required even if a personal computer is owned. With the spread of computers, demand for cards with recording media is expected to increase further, and the general individual should shift to the use of creation and distribution. At this stage, however, the equipment system that can accept this trend has been set up. Not. (E) Opening information data by exchanging a card-type recording medium between two different operating systems. So-called standards and compatibility issues. (F) Issues in dissemination. Personal computers that already have a personal computer while satisfying the conditions of (a), (b), and (c), which significantly improve the convenience for organizing business cards and other cards and for various purposes. It does not meet the conditions for widespread use unless it requires replacement of peripheral equipment and does not require a large cost burden for additional purchase, it is easy to handle, and it does not provide an incentive to switch from conventional business card cards . In the case of the "telephone with card reader" disclosed in Japanese Patent Application Laid-Open No. 5-41733, a new replacement cost is required for telephones and business cards. However, the motivation to use this system is brought about by the effect of automated dialing. It is difficult to imagine that the condition (f) is satisfied. The present invention overcomes the above-mentioned problems (a), (b), (c) and (d), (e) and (f), especially for cards used by all members of society such as business cards. The goal is to be able to use systems that are already owned by as many users as possible, or that are considered to be the most widely used in the future. Therefore, the present invention aims to use a card-type magnetic recording medium that meets the above-mentioned problems and a personal computer, with the aim of easily using the personal computer owner at a minimum cost. The present invention provides an adapter using a 3.5-inch floppy disk drive, which is currently provided as a standard equipment in most personal computers, as a main body of the interface device.

[0004]

In order to solve the problems in the magnetic card, a core of the interface device of the card is a 3.5-inch floppy disk so that anyone who has a personal computer can use it immediately. -Use the same magnetic card as a drive as a floppy disk.
The present invention is to provide an adapter for use in a drive and a magnetic card or the like having a standard for enabling use in the drive. A magnetic material equivalent to a floppy disk HD type is provided as a recording medium on the entire back surface of a card made of fibrous base material such as plastic or paper.
Also, since the number of tracks of the magnetic band of the magnetic card is equivalent to the number of tracks of the same type and one side of the disk, for example, when the card is used as a business card, the recording medium has the name, status, affiliation, address, telephone It is possible to record various information data such as numbers, still images and voices if the capacity is smaller, and information having a capacity relatively higher than that of a normal magnetic card. As shown in FIG. 1 except that the dedicated application software is started, the magnetic card Z is set in the slit 9 from the inlet of the adapter Y, and the adapter Y is inserted into the slot X of the floppy disk drive. In this manner, information data stored in the magnetic card can be received and transmitted in a manner of handling a normal floppy disk. When the magnetic card Z is used as a business card, the stored information data as described above is received and transmitted to a personal computer and displayed on a display. In addition, a database and address printing are performed according to the purpose of the user. And so on.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic card Z according to an embodiment of the present invention will be briefly described below. The magnetic card Z described in claim 2 is made of a base material made of fibrous material such as plastic or paper, which has a small expansion and contraction rate with respect to environmental changes such as temperature and humidity, and the card is a business card on its surface. In
Write your name, identity, phone number, address, etc. on the surface. Regarding cards other than business cards, names and other necessary information,
Enter symbols, numbers, etc. The magnetic recording medium provided on the card has the same magnetic properties as those used in a normal 3.5-inch high-density medium type floppy disk, with respect to the short side end of the card shown in FIG. 2A or the entire back surface shown in FIG. 2B. Coat powder or apply magnetic stripe or magnetic film. The magnetic material, a so-called magnetic recording medium, includes information written on the surface of a card such as a business card, and, if necessary, a display via another personal computer.
It records data such as characters, small-capacity images, and sound that can be reproduced by a speaker and a printer. As a feature of the magnetic card of the present invention, as described in the third and fourth aspects, a single magnetic card can be provided with a plurality of magnetic media. For example, for a card having a characteristic that is widely exchanged, such as a business card, the operating system of the personal computer used on the handing side and the operating system of the personal computer used on the receiving side are not always the same. Are recorded in different formats for the purpose of ensuring the same. If the format is unified in the future, or if the format is unified by the user, it is of course possible to store different information in each magnetic medium in the same format, and four different formats are stored on the same card. It is also possible. As described above, at the discretion of the user, each of the four magnetic media is classified by format or purpose.
It can be set arbitrarily. In this case, the method described in claim 4 is employed. In the method described in the same paragraph, as shown in FIG. 5, apart from the magnetic card, an ultra-thin glued paper 2 for writing characters is used.
2 is attached to the surface of a magnetic card. When the information data is read from the card by the device,
The paper 22 on which characters are described is peeled off and used. The purpose is to protect the surface of the magnetic recording medium when not in use, and to separate the printed (written) part from the magnetic card part to prevent problems such as physical damage to the magnetic recording medium during printing (written). is there. Also, the magnetic card described in claims 2 to 4 can be provided with a separate recording medium 20 such as a bar code as shown in FIGS. 3B and 3C as described in claim 5. I have. This is not only for the use of the adapter of the present invention, but also for the reading device other than the use of the adapter of the present invention. Etc. are determined at that time. The meaning of claim 6 is that the protective sheet 21 is attached to protect the magnetic surface from obstacles such as scratches and dust, and that the four sides of the sheet slightly protrude from the card as shown in FIG. With this size, the card 4 has a role of protecting the sides of the card from shocks such as vibrations when the card is directly carried, etc., and is designed so that off-track does not occur due to deformation of each side. The user peels off the sheet immediately before use, that is, immediately before setting the sheet on the adapter. FIG. 8 shows the track format of the magnetic card of the present invention. However, from 51 to 6
The size of each area byte number up to 5 is not reflected in FIG. 51 is an "index signal" for the floppy disk drive to detect the starting point of the track, 52 is a "gap", 53 is a "SYNC", 5
Reference numeral 4 denotes an “index mark”, a track start point detection position as software, and four or more areas of 55 “gap” constitute a preample, and serve as a buffer area for the track start point and index timing. 56 is "SY
NC ", 57 are" ID Address Mark ",
58 is “ID” for specifying a sector, 59 is “CR”
C (Cyclic Redundancy cod
e), the ID area is composed of the above four areas. Next, 61 "SYNC" which constitutes the data section with 60 gaps interposed
And 62 "Data Address Mark",
There are 63 "data" and 64 "CRC", ending one sector with a gap of 65. As described above, the various functions of each area conform to the format of the 3.5-inch floppy disk / HD type. The magnetic card,
Although it is used in a floppy disk drive, unlike a normal disk type magnetic recording medium shown in FIG. 6A, it is a rectangular card type magnetic recording medium as shown in FIG. 6B. Data track 25a
Instead, the data track 25b has a linear shape.
The track band of the floppy disk must intersect perpendicularly with the gap of each of the read, write and erase of the magnetic head. In the above-mentioned linear data track 25b band, since the direction of the linear motion in the adapter housing of the card is parallel to the short side, the direction of the track is similarly arranged parallel to the short side. Further, as a form specific to the magnetic card of the present invention, the number of tracks conforms to that of a normal floppy disk, but the number of sectors and the number of sides are each limited to one. FIG. 9A is an example of a file configuration of a normal floppy disk, and FIG. 9B is an example of a file configuration of a magnetic card of the present invention. 9A and 9B, a FAT (File Alloca) for managing files included in a normal floppy disk.
region) "a", "b", "
c "," d "and root directory areas" e ","
9B, f "," g "," h "," i ", and" j "are not included as shown in Fig. 9B.Physical restrictions on converting a normal disk-type drive to a card-type magnetic medium. However, since the position and amount of reading and writing on the magnetic card are fixed beforehand, no method is used.The file management system is originally located on the floppy disk, and includes a boot loader and a FAT area. When the computer reads the target data, for example, when the computer reads the target data, the first cluster number of the target data is indicated by “root entry January” shown in FIG. 9C in the “root directory”. This is executed by receiving an instruction of the order of the cluster (sector, track) of the target data by "FAT". According to the present invention, when the application software of the card is used, the card is used as the only recording medium, and the type and capacity of the information data to be read or written are always based on a certain standard, so that the card can be read even when recording. In this case as well, by setting in advance commands that always start with the same cluster number and end in order, a simple form as shown in FIG. 9B can be realized. This means that the file management system which should normally exist as shown in FIG. 9A is excluded from the recording medium side, and is transferred to the computer side, that is, the software side. The recording of the information data of the card must be stored in a unique cluster location and order by a unique instruction different from that of a normal floppy disk. Therefore, dedicated hardware is used for formatting (initialization). is required. Generally, when the card is used as a business card, the format and the writing of personal information are performed simultaneously with a certain production process and dedicated hardware. On the other hand, even when a general individual creates a certain kind of card, it is possible to personally implement a card that has been formatted in advance by using driver software for designating a cluster as a data recording location. Next, the adapter according to claim 1, which enables the magnetic card to be used in a 3.5-inch floppy disk drive, will be described. The adapter uses a housing of the same shape and dimensions as a 3.5-inch floppy disk. Regarding the housing and parts, it is generated from the crank mechanism inside the adapter while considering the selection of materials with nonmagnetic metal etc. (in this case, excluding the metal hub 10) that does not affect the magnetic medium at the place where metal is used. In order to prevent off-track of the magnetic head from occurring due to resonance, materials of the upper shell 26 and the lower shell 1 constituting the housing are made of a highly rigid metal and have a high specific gravity. It is desirable that the metal be a highly rigid metal that is very thin and hardly distorted because it can move between the disk crank 4. The disk crank 4 is a component having a concave structure for receiving the pin 11b, and is made of a metal having a high specific gravity in order to move the crank stably. No need to choose. Each guide ring 5a, 5b
For the low friction metal such as anti-friction alloy, large and small ring stays 6a, 6b, 6c, 6d and 7a, 7b,
It is preferable that the lower shells 7c and 7d are integrally formed of the same material at the same time as the lower shell 1, but it is also possible to retrofit light metal as a raw material. The metal hub 10 uses magnetic stainless steel. The head pressure adjusting spring 16 uses a thin stainless steel plate or the like. The liner 17 mounted inside the spring 16 is a nonwoven fabric made of polyester, rayon, or the like. Bearings may be used for connecting portions 12a and 11b, guide rings 5a and 5b, and the sleeve 14 so that friction can be reduced as much as possible. The carriage 2 is a component that is movable in a small space while accommodating a card. However, as long as the material is lightweight and strong, the material is not particularly limited to metal or resin. FIGS. 7A to 7G show the most basic configuration diagrams of the adapter. As described above, the basic operation of the adapter is to act as a mechanical intermediary for handling the magnetic card having a linear track band with a normal floppy disk drive. A carriage 2 for storing and fixing the medium and performing a linear motion parallel to the track band is provided. This will be described below with reference to the drawings. Both slits 9 are card taking-in portions provided on the carriage 2. The magnetic card Z is attached to the slit 9 by opening a card opening / closing opening / closing section 8 (figure finger is shown, but details are not shown in the figure).
The card Z (FIG. 7C shows a state in which the card is mounted) transfers the circumferential motion transmitted from the spindle motor of the floppy disk drive and the table 15 to the metal hub 10.
Is received on the adapter side by a disk crank 4 that moves integrally with the carriage 2, and the same circumferential movement is performed from the crank 4 by the carriage 2.
The carriage 2 is converted into a reciprocating linear motion by the connecting plate 3 for transmitting the motion, and at this time, the carriage 2 has its own sleeves 14a and 14b provided with ring stays 6a, 6b, 6c, 6d, 7
Guide rings 5a and 5b fixed at 7a and 7b
The linear motion is corrected by this, and an operation environment in which off-track hardly occurs is prepared. In addition, the disc crank 4 and the carriage 2 are connected by pins 11b and pins 11a provided on the connecting plate 3, respectively. The connecting plate having both pins is convex, and the disc crank 4 is concave at the connecting portion b.
In the connecting portion 12a, the carriage 2 means a pair structure having a concave structure. Since the magnetic card Z uses the "side 0" side of the floppy disk drive, the side for reading and writing is directed toward the upper part of the adapter. At this time, the head on the side 1 not used does not directly contact the card. Thus, the head pressure adjusting spring 16 is provided. At the same time as preventing the magnetic head on the side 1 from directly contacting the card, the spring 1
The card Z has a function to make the card Z appropriately contact the head on the side 0 side by the liner 17 mounted on the inside of 6.
The liner 17 also contributes to stable linear motion without blur and removal of dust and static electricity. Next, a module for reading data from the magnetic card of the present invention is shown in FIG.
Will be briefly described with reference to the flowcharts of steps 101 to 113 in FIG. Step 101: A reading start track number set in advance is given. Step 102: Set a track number to start reading in the data register. Step 103: Give an allowable number X of the number of read errors. Step 104: Prepare for reading execution. Step 105: Move the head to the designated track. Step 106; Step 1 when head movement is completed
To 07. If the movement of the head fails, the reading module is “ended in error”. Step 107: Set the designated sector number in the sector register. Here, it is sector 1. Step 108: Read the specified sector. Step 109: If no read error occurs, go to step 112. If an error has occurred, go to step 110. Step 110: Decrement the read retry counter by one. Step 111: If the retry counter is not X = 0, go to step 108. If X = 0, cause the read module to "error end". Step 112: Check whether the track is the last track set in advance, and if it is the last track, make the reading module "normally end". If it is not the last track, go to step 113. Step 113: Enter the track number stepped in by one track from the current track position of the head in Step 1
Hand over to 02. Next, a module for writing to the magnetic card according to the present invention will be briefly described with reference to a flowchart from each of steps 201 to 218 in FIG. Step 201: A preset write start track number is given. Step 202: A track number at which writing is started is set in the data register. Step 203: The allowable number Y of write errors is given. Step 204: Prepare for writing execution. Step 205: Move the head to the designated track. Step 206; Step 2 when the head movement is completed
To 07. If the movement of the head fails, the writing module is "error-terminated". Step 207: Give an allowable number X of the number of read errors. Step 208: Set the designated sector number in the sector register. Here, it is sector 1. Step 209: Write to the specified sector. Step 210: If no write error occurs, go to step 211. If an error has occurred, go to step 215. Step 211: Check the written data. Step 212: If there is no error in the data, go to step 217. If an error occurs, step 213
What. Step 213: Decrease the read retry counter by one. Step 214: If the retry counter is not X = 0, go to step 211. If X = 0, go to step 215. Step 215: Decrease the write retry counter by one. Step 216: If the retry counter is not Y = 0, go to Step 207. If Y = 0, the write module is "error ended". Step 217: Check whether the track is the last track set in advance, and if it is the last track, terminate the writing module "normally". If it is not the last track, go to step 216. Step 218: Enter the track number stepped in by one track from the current track position of the head in Step 2
Hand over to 02. As described above, the basics of the process indicate that tracks in one sector are sequentially read and written in order.

[Effect of the invention]

A magnetic card system to which a floppy disk drive according to the present invention is applied is a magnetic card system having the characteristics described in the above-mentioned "Means for Solving the Problems" as long as the user owns a personal computer. The biggest feature is that anyone can use it easily. There is also a utility in which a general individual can freely create and distribute a magnetic card which has been conventionally used for special purposes. Further, the magnetic card of the present invention
Another feature of the magnetic card is that it has a relatively large storage capacity because of the number of racks equivalent to a floppy disk. For this reason, with the rapid spread of personal computers in ordinary households as well as in companies, it has transcended the category of conventional business cards and other cards that only described simple text information, and built new communications between individuals. It can be a foundation.

[Brief description of the drawings]

FIG. 1 is an image diagram of a point of use of the present invention.

FIG. 2A is a side view of a magnetic card Z used in the present invention, in which a magnetic substance (magnetic recording medium 18) is adhered or coated on the entire surface of a base material 19 and is an enlarged side image view.

FIG. 2B is an enlarged side view showing a magnetic card Z used in the present invention, in which a magnetic material (magnetic recording medium 18) is adhered or coated only to a necessary portion on a base material 19;

FIG. 3A is a rear view of a magnetic card Z used in the present invention, wherein the magnetic card Z has two magnetic surfaces at necessary portions and corresponds to claim 3;

FIG. 3B shows a magnetic card Z used in the present invention, in which two magnetic surfaces are provided in necessary portions, and a recording medium 20 such as a bar code and a magnetic medium for use other than the present invention is provided in a central portion. It is a rear view of the magnetic card Z corresponding to claim 5.

FIG. 3C is a magnetic card Z used in the present invention, in which a magnetic material is provided on the entire surface of a base material 19, and a recording medium such as a bar code and a magnetic medium for use in a means other than the present invention is provided in the center. It is a magnetic card Z back view corresponding to claim 5.

FIG. 4 is a magnetic card Z back view corresponding to claim 6, wherein a protective sheet 21 slightly larger in size than the magnetic card Z used in the present invention is adhered to the card back surface.

FIG. 5 is a perspective view of a magnetic card Z according to claim 4, wherein the magnetic card Z used in the present invention is pasted with paper (character pasting paper 22) on which characters and the like can be written and which can be easily peeled off. FIG.

FIG. 6A is a diagram illustrating a disk-type data track band of a 3.5-inch floppy disk.

FIG. 6B is a diagram illustrating a linear data track band used in the magnetic card Z of the present invention.

FIG. 7A is an internal front view of the adapter of the present invention with the upper shell 26 removed.

FIG. 7B is a plan view of the card Z mounted on the carriage 2 and viewed from above the carriage, excluding the housing portion and the lower shell 1, showing that a slit portion in the carriage is closed at the upper portion. is there.

FIG. 7C is a front elevational view of a state where the card Z is mounted on the carriage 2 and the upper shell is removed from the adapter of the present invention.

FIG. 7D is a plan view showing the state where the card Z is mounted on the carriage 2 and the lower part of the carriage except for the housing portion and the lower shell 1 is seen.

FIG. 7E is a side view in which the structure of a main movable part such as a crank inside the adapter of the present invention is emphasized and enlarged and is viewed from a side.

FIG. 7F is an external view of the adapter lower shell 1 of the present invention.

FIG. 7G is a structural view of the adapter of the present invention.

FIG. 8 shows the format of the magnetic card Z of the present invention.
It is a map.

FIG. 9A shows a file configuration and a cluster number on a 3.5-inch floppy disk 2HD for MS-DOS.

FIG. 9B is a magnetic card Z when a 3.5-inch floppy disk 2HD type for MS-DOS is implemented in the present invention.
It is an example of the above file configuration and cluster number.

FIG. 9C is a schematic diagram of a directory entry in a root directory in a 3.5-inch floppy disk 2HD type for MS-DOS.

FIG. 10 is a flowchart of a reading module of the magnetic card Z in the present invention.

FIG. 11 is a flowchart of a writing module of the magnetic card Z in the present invention.

[Explanation of symbols]

1: Lower shell 2: Carriage 3: Connecting plate 4: Disc crank 5a: Guide ring 5b: Guide ring 6a: Ring stay (large) 6b: Ring stay (large) 6c: Ring stay (large) 6d : Ring stay (large) 7a: Ring stay (small) 7b: Ring stay (small) 7c: Ring stay (small) 7d: Ring stay (small) 8: Card opening / closing opening 9: Slit 10: Metal hub 11a: Pin connecting connecting plate 3 and carriage 2 11b: Pin connecting connecting plate 3 and disc crank 4 12: Connecting portion a connecting connecting plate 3 and carriage 2 13: Connecting plate 3 Connecting part b for connecting the disk crank 4: sleeve 15: table 16: head pressure adjusting spring 17: liner 18: magnetic recording medium 19: base 20: Other recording medium such as a barcode 21: Protective sheet 22: Sticky paper for writing characters 23: R / W gap (read / write gap) 24: Erase gap 25a: Data track of floppy disk 25b: Magnetic card Data track 26: upper shell X: slot of floppy disk drive Y: adapter of claim 1 Z: magnetic card of claim 2, which corresponds to any one of claims 3 to 6.

Claims (6)

[Claims] 1. A magnetic card capable of reading and writing data using a 3.5-inch floppy disk drive, and having a mechanical intermediary function between the drive and the magnetic card. An adapter that configures a magnetic card data read / write system that uses an inch floppy disk drive. 2. A data read / write system for a magnetic card using a 3.5-inch floppy disk drive, which has a card size, a recording data format, and the like, which are standards for use in the adapter according to claim 1. A magnetic card intended to be used. 3. A single card, a character symbol on the surface,
3. A data read / write system for a magnetic card using a 3.5-inch floppy disk drive according to claim 2, wherein a mark or the like is described, and two separate magnetic recording media are provided on the upper and lower portions of the short side of the card, respectively. A magnetic card intended to do. 4. Two separate magnetic recording media are provided on both sides of a single card at the upper and lower portions of the short side of the card, and one of the two sides is paper or vinyl for writing a character, a mark, or the like. 3. A magnetic card for use in a data reading / writing system for a magnetic card using a 3.5-inch floppy disk drive according to claim 2, wherein a material such as the above is adhered. 5. A separate recording medium such as a bar code is provided at the center of the back surface of the magnetic card.
5. A magnetic card for use in a data reading / writing system for a magnetic card using a 3.5-inch floppy disk drive according to claim 4. 6. The magnetic card according to claim 2, further comprising a protective sheet made of paper or vinyl for protecting the surface of the recording medium from dirt and scratches and preventing deformation of the corners and four sides of the card.
6. A magnetic card for use in a data read / write system for a magnetic card using a 3.5-inch floppy disk drive according to claim 5.