JPS62266765A - Disk driving device for 3.5-inch floppy disk - Google Patents

Abstract

PURPOSE:To reduce the probability of write error and read error occurrence by providing a disk detector which detects the kind of a disk inserted into a disk insertion part and switching analog circuit constants with the detection signal of the detector according to a corresponding kind. CONSTITUTION:The detector 8 which detects a detection hole 7 bored in the jacket of a floppy disk 2 of one kind is provided in the disk insertion part 1 and the analog circuit constant 6 of a writing circuit 4 and a reading circuit 5 is switched by an analog switch 9 to a constant 6 corresponding to the kind based on the detection signal 10 from the detector. Further, an abnormality reporting means 11 sends out an abnormality signal 14 to a control part 12 when the kind of a floppy disk specified with a mode selection signal 13 sent out of the external control part 12 is different from the kind of the floppy disk detected by the detector 8. Thus, the probability of write error and read error occurrence is reduced.

Description

Detailed Description of the Invention [Field of JIJ in Industry 1] The present invention enables the use of two types of 3.5-inch floppy disks: HD (high density) type and 2DD (double-sided double density) type. The present invention relates to a 5-inch floppy disk drive device.

[Prior art] A 3.5-inch floppy disk (hereinafter abbreviated as disk) housed in a plastic hard jacket.
The magnetic recording density is HD (high + Jansity).
: High density; hereinafter abbreviated as HD type disk) type and 2
D D (tow 5ide double dens
ity: double-sided f8 density; hereinafter abbreviated as 2DD type disk). When using an HD type disk, the data transfer speed is set to 500 kbH/s, and the storage capacity when unformatted is a maximum of 2 MB using the MFM method. On the other hand, when using a 2DD type disk, the data transfer rate is 250 kbit/s and the storage capacity is the maximum IMB.

In this way, since the data transfer speed and disk resolution are different between HD disks and 2DD disks, the write current limiting resistance in the write circuit that sends the old data signal stream to the magnetic head is The resistance value and the differential constant in the reading circuit that reads the detection signal of the magnetic head,
It is necessary to change the cutoff frequency of the low-pass filter depending on the type of disk used.

Therefore, in a floppy disk drive device that can use both HD type disks and 2DD type disks, two types of analog circuit constants such as the above-mentioned resistance value, differential constant, cutoff frequency, etc. are incorporated, and the Depending on the type, the analog circuit constants listed in (1) are selectively connected to the magnetic head by an analog switch. This analog switch is driven by a mode selection signal specifying the type of disk to be used from an external control unit such as a host computer.

′['Problem that the invention seeks to solve]However,
As described above, the following problems also occur in the 3- and 5-inch floppy disk drive devices in which the analog circuit constants are switched by the mode selection signal from the external control section.

In other words, even if the type (type) of the disk specified by the mode selection signal sent from the external control section and the type (type) of the disk actually inserted into the disk insertion section are different, the analog circuit constants may be incorrect. Write and read information to the disk as is. If the type of disk actually inserted does not correspond to the analog circuit constants as described above, there is a problem in that the probability of writing errors or reading errors occurring during writing and reading increases.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide an HD disk detector for detecting the type of disk inserted into the disk insertion section, and to provide a detection signal for the detection signal of this detector. By switching the analog circuit constants based on the method, the type of disk actually inserted can be matched with the analog circuit constants, which can greatly reduce the probability of writing and reading errors and improve reliability.3,5 An object of the present invention is to provide an inch floppy disk drive device.

[Means for Solving the Problems] As shown in FIG. 1, the present invention provides magnetic recording of a 3.5-inch standard floppy disk 2 inserted into a disk insertion portion l while being housed in a hard jacket. By writing and reading information on the magnetic recording surface using the magnetic head 3 and changing the analog circuit constants 6 in the writing and reading circuits 4 and 5 connected to the magnetic head 3, magnetic recording on the magnetic recording surface can be performed. The density is HD (high density) type and 2DD (
In a 3- and 5-inch floppy disk drive device that can use two types of floppy disks: a double-sided (double-density) type and a HD type floppy disk, an HD type floppy disk is inserted into the hard jack of the HD type floppy disk in the disk insertion section 1. An HD disk detector 8 for detecting the disk detection hole 7 is provided,
The analog switch 9 changes the analog circuit constant 6 of the write/read circuits 4 and 5 to the analog circuit constant 6 corresponding to the HD type based on the detection signal 10 from the HD disk detector 8.
It was designed to switch to .

In another invention, in addition to the above invention, abnormality 2. The first means 11 sends an abnormality signal 14 to the external control section 12 when the floppy disk type specified by the mode selection signal 13 sent from the external control section 12 is different from the floppy disk type detected by the HD disk detector 8. That's what I do.

[Function] In a 3.5-inch floppy disk drive device configured with fM in this way, when an HD floppy disk is inserted into the disk insertion section, the hard jacket of the HD floppy disk is penetrated. The HD detection hole is detected by the HD disk detector, and the analog switch is operated by the detection signal from the HD disk detector, and analog circuit constants corresponding to the HD type floppy disk are set in the write/read circuit. . Therefore, analog circuit constants corresponding to the type of floppy disk actually inserted are necessarily selected.

In addition to the effects 1-2, another effect of the invention is that even if the type of floppy disk designated by the mode selection signal sent from the external control unit matches the type of the floppy disk actually inserted into the disk insertion section. If not, an abnormality signal is sent to the external control unit.

[Example] An example of the present invention will be described below with reference to the drawings. 2(a) and 2(b) are f-plane views showing the front and back surfaces of a 3.5-inch floppy disk used in the 3.5-inch floppy disk drive device of the embodiment. That is, this 3.5-inch floppy disk (hereinafter abbreviated as disk 21) is housed in a square plastic hard jacket 22, and the disk 21 is inserted into the center of the disk 21 from the back side. A hub 23 is provided for engagement with the spindle of a spindle motor to be rotated.
A window 24 for the magnetic head to face the disk 21 is provided on the insertion direction side of the floppy disk drive device No. 2.
A window 24 is opened and closed by a shutter 25.

Further, (2) WP (write protect) holes 26 for write-protection IL and HD disk detection holes 27 are bored at both corners of the first card jacket 22. and,
A slide shutter 28 is attached to the back side of the WP hole 26, and this slide shutter 28 closes the WP hole 26.
Data can be written to the disk 21 by blocking the space.

Further, the HD disk detection hole 27 is connected to the HD'J described above.
It is provided only on the No. 2 disk 21, and is not provided on the 2DD type disk 21.

FIG. 3 is a perspective view showing the main parts of the 3.5-inch floppy disk drive device according to the embodiment. [In the figure, 28 is the hard jacket 2 inserted into the disc insertion section.
300 rpa+ or 3
This is a spindle motor that rotates at a constant speed of 60 rpm, and the spindle 29 of this spindle motor 28
A hub 23 formed at the center of the disk 21 engages with the hub 23 . In addition, a stepping motor 30 is mounted on the frame (not shown).
is fixed, and by rotating the screw shaft 31 of this stepping motor 30, this screw shaft 31
A carriage 32 screwed into the disk 21 moves in the radial direction of the disk 21 while being guided by a shaft 33. A pair of head arms 34 are attached to the carriage 32 so as to sandwich the disk 21 from both sides, and this head arm 3
A pair of magnetic heads 35a and 35b are attached to the tip of the hard jacket 22 so as to face the image recording surface of the disk 21 through a window 24 formed in the hard jacket 22. Also, 3 in the diagram
A track zero detector 6 detects when the magnetic healds 35a and 35b have reached a track zero position indicating the outermost recording track among the recording tracks formed on the recording surface of the disk 21.

In addition, a WP hole 26 and an HD disk detection hole 28 formed in the hard jacket 22 are provided in the disk insertion portion.
A WP detector 37 and an HD disk detector 38 are provided for detecting. Also, when the disk 21 rotates once, the magnet 39 attached to the spindle motor 28
rotates once, and an L level IND (index) signal is sent out from the index detection 640.

FIG. 4 is a block diagram showing a 3.5-inch floppy disk drive device according to an embodiment. FIG. 1+41 shows a control unit made of, for example, a microcomputer, which sends various control signals for executing old information reading from the disk 21 based on various commands from an external control unit such as a host computer.

This control section 41 has an IN input from the index detector 40.
Index control circuit 42 to which the D signal is input. An operating lamp 43° indicates that the floppy disk drive device is in operation, and a disk insertion detector 44 detects that the disk 21 is properly inserted into the disk insertion portion as shown in FIG. A disk control circuit 45 to which the insertion detection signal and the IND signal from the index control circuit 42 are input. STP (step) signal is sent to the stepping motor 30 and TR0O (track zero) is sent from the track zero detector 36.
A magnetic head position control circuit 46 to which signals are input manually. A mode selection control circuit 47 to which the detection signal from the HD disk detector 38 is input; the WP detector 37. A head selection circuit 48 that selects the magnetic beds 35a and 35b on which to perform write and read operations. A write/read circuit 49 is connected to send a write signal to each magnetic head 35a, 35b via this head selection circuit 48, and read detection signals of the three magnetic heads 35a, 35b.

This write/read circuit 49 is connected via an analog switch 50 to an analog circuit 51a for setting analog circuit constants corresponding to an HD type disk and an analog circuit 51b corresponding to a 2DD type disk.

Furthermore, the detection signal sent from the HD disk detector 38 via the Monido control circuit 47 controls the switching of the analog switch 50 and the speed changeover switch 52.
The signal is input to a motor drive control circuit 53 that controls the drive of the spindle motor 28 via the motor. The motor drive control circuit 53 rotates the spindle motor 28 when an L-level motor-on signal is input from an external control section. Then, the speed control terminal connected to the speed changeover switch 52 is set to H.
When the level is reached, the rotation speed of the disk 21 is increased to the normal 300.
rpo+stitch, and when it reaches L level, it is controlled to 360 rpa. When the speed selector switch 52 is open, the speed control terminal is set to H as described later.
level, and the rotational speed of the disk 22 is 300 rp.
It becomes Ill.

FIG. 5 shows the HD disk detector 38. Mode selection control circuit 47. Analog switch 50. magnetic head 35a,
35b, analog circuit 51a.

51b and a circuit diagram showing details of the write/read circuit 49. FIG.

That is, the detection signal output from the HD disk detector 38 consisting of a photodiode and a phototransistor is input into the mode selection control circuit 47, and directly input to the analog switch 50, as well as the inverter 54. It is manually input to the speed control terminal of the motor drive control circuit 53 via the speed changeover switch 52 . Therefore, when an HD disk is inserted into the disk insertion section, the HD disk detector 38 outputs an H level detection signal, and when a 2DD disk is inserted into the disk insertion section, the HD disk detector 38 outputs an L detection signal. A level detection signal is output.

First, write data input from the external control unit via the control unit 41 is input to the write circuit 55 and the common current circuit 56. The write signal output from the write circuit 55 is transmitted through transistors 57a, 57b and diodes 58a, 5.
8b to both ends of the coils of the magnetic heads 35a and 35b.

The common current of the write signal flowing out from the middle point of the coil is connected to the switching contact 59. of the analog switch 5G. The current flows into the ground terminal of the common current circuit 56 via one of the current limiting resistors 59a, 60b and the transistor 61 whose conduction is controlled by the common current circuit.

Further, the read signals detected from both ends of the coils of the magnetic heads 35a and 35b are amplified by an amplifier 62, and then transferred to each of the switching contacts 63 and 64 of the analog switch 50, and to one of the low-pass filters 65a consisting of a capacitor and a coil.
, 65b to the differentiator 66. The output signal of the differentiator 66 is compared with a reference level by a comparator 67, binarized to H level or L level, and sent as read data to an external control unit via the control unit 41. Further, the differential constant of the differentiating circuit 66 is the same as that of the analog switch 5.
Either one of the differential constant circuits 69a, 69b consisting of a resistor, a capacitor and a coil is connected by the switching contact 68 of 0.
is set to Thus, a current limiting resistor 60a and a low pass filter 65a.

The differential constant circuit 69a constitutes an analog circuit 51a, and the current limiting resistor 60b, the low-pass filter 65b, and the differential constant circuit 69b constitute an analog circuit 51b. Also,
Amplifier 62. Differentiator 66 and comparator 67 constitute a readout circuit.

The analog switch 50 is connected to the HD disk detector 38.
When a detection signal of L level is input manually.

2 as shown in the figure.
When connected to each normally closed terminal side corresponding to a DD type disk, and when an H level detection signal is input manually, each switching contact 59, 63
, 64 and 68 are switched and connected to each normally open terminal side corresponding to the HD disk.

Further, the detection signal from the HD disk detector 38 inputted manually into the mode selection control circuit 47 is sent to the exclusive OR gate 70.
is input to one of the input terminals.

The other input terminal of this exclusive OR gate 70 has l
A mode selection signal sent from an external control section is input via the il control section 41. Note that when the mode selection signal sent from the external control section is at H level, it indicates that an HD type disk is specified, and when it is at L level, it indicates that a 2DDu disk is specified. The output signal of the exclusive OR gate 70 is input to one input terminal of a Nantes gate 71, and the other input terminal of the Nantes gate 71 receives a signal output from the disk control circuit 45 when the disk 21 is inserted. When the disk 21 is rotating at a normal speed, the RD double signal which becomes L level is manually input. This Nantes Gate 71
The output signal is sent to the control unit 41 as a ready signal or an abnormal signal.
is sent to the external control unit via. Therefore, the output signal of exclusive OR gate 70 becomes L level, and R
When the D times signal reaches the L level, the Nant gate 71 sends out an L level ready signal. Further, when the output signal of the exclusive OR gate 70 becomes H level, the Nant gate 70
An abnormal signal ranging from 1 to H level is sent to the external control section.

Thus, the mode selection control circuit 47 constitutes an abnormality notification means that sends an abnormality signal to the external control section.

The operation of the 3- and 5-inch floppy disk drive device configured as described above will be explained.

First, when the speed selector switch 52 is initially opened, the speed control terminal of the motor drive control circuit 53 is at the H level, so the rotational speed of the spindle motor 28 is 3.
00 rpm.

Then, when an HD type disc is inserted into the disc insertion section, the HD disc detector 38 detects the HD disc detection hole 27, so the HD disc detector 2i'i3g sends an H level detection signal to the analog switch 50. . Therefore, each switching contact 59 of the analog switch 50
．． 63, 64, and 68 are connected to normally open terminals as shown in FIG. As a result, the write current value of the write circuit 55 is set by the current limiting resistor 60a, the cutoff frequency of the read circuit is set by the low pass filter 65a, and the differential constant of the read circuit is similarly set by the differential constant circuit 69a. .

As a result, the valley analog circuit constants corresponding to the inserted HD type disc are selected.

Also, when a 2DD type disk is inserted into the disk insertion section, the hard jacket 22 of this 2DD disk has an H
Since the D disk detection hole 27 is not drilled, the detection signal of the HD disk detector 38 is at L level. Therefore, each switching contact 59, 63 .
64. δ8 is connected to the normally closed end T. As a result, Z
Analog circuit constants such as a current limiting resistor 60b, a low-pass filter 65b, and a differential constant circuit 69b corresponding to the DD type disk are selected and set.

Note that if the disk 21 is not inserted into the disk insertion section at all, the disk insertion detector 44 does not send out a disk insertion detection signal, so no write/read operation is performed. Therefore, no problem occurs even if each switching contact of the analog switch 50 is connected to the normally open terminal side.

In this way, the type (type) that is always inserted into the disc insertion section
Analog circuit constants corresponding to the disk 21 are selected and set. As a result, the probability of writing errors and reading errors occurring can be reduced.

Next, the operation of the mode selection circuit 47 will be explained.

First, when an HD type disk is inserted into the disk insertion section and an H level mode selection signal specifying the HD type disk is input from the external control section, the exclusive OR gate 70
The output signal becomes L level.

If the RD double signal is at L level indicating normality, an L level ready signal is sent from the Nant gate 71 to the external control section. Next, when a 2DD type disk is inserted into the disk insertion section and an L level mode selection signal specifying the 2DD type disk is input from the external control section, the output signal of the exclusive OR gate 70 becomes L level. Become. Therefore, as described above, an L level ready signal is sent from the Nant gate 71 to the external control section.

However, the disk 21 inserted into the disk insertion section
If the disk type specified by the mode selection signal sent from the external control section is different, the output signal of the exclusive OR gate 70 becomes H level. Therefore, even if the RD double signal is maintained at the normal L level, an abnormal signal at the H level is sent from the Nant gate 71 to the external control section. As a result, the external control section constituted by a host computer or the like can recognize that a disk of a different type than the mode selection signal is inserted.

Next, the operation of the speed changeover switch 52 will be explained. Generally, when using a 2DD type disk, the rotation speed is 30
Orpm is controlled to a constant value, but when using an HD type disc, the above rotation speed is controlled at 300 rpm and 360 rpm.
It is possible to switch between pm and pm. i.e. 300 r
pm, the storage capacity mentioned above is 2 MB, but 3 MB.
If it is B Orpm, the memory annotation will be 1.6MB.

Therefore, when using a ZDD type disk, it is to be rotated at the normal speed of 300 rpm, and when using an HD type disk, it is to be rotated at 360 rpo+, the speed changeover switch 52 is turned on.

When a 1 (D type) disk is inserted into the disk insertion section with the speed changeover switch 52 turned on, an H level detection signal is sent from the HD disk detector 38. The speed control terminal of the motor drive control circuit 53 becomes L level.As a result, the spindle motor 28 rotates at 360 m.

Conversely, if you insert a 2DD type disk into the disk insertion section,
Since the HD disk detector 38 detects L level (number 3), the speed control terminal of the motor drive control circuit 53 becomes H level. As a result, the spindle motor 28 rotates at 300 rpm.

Note that when the speed selector switch 52 is open, the fifth
As shown in the figure, the speed control terminal r of the motor drive control circuit 53 has a pull-up resistor connected to the +5V control power supply.
is maintained at H level.

Therefore, in this case, the spindle motor 28 rotates at 300 rpm, regardless of the type of disk 21 inserted.

By turning on the speed changeover switch 52 in this manner, it is possible to automatically change the number of revolutions of the disk 21 in accordance with the type of disk 21 inserted by λ·1.

[Effects of the Invention] As explained below, according to the present invention, an HD disk detector is provided to detect the type of disk inserted into the disk insertion section, and analog circuit constants are set for the detection signal of this detector. Switching. Therefore, the type of disk actually inserted and the analog circuit constants can be matched without fail, and the probability of writing and reading errors can be significantly reduced and reliability can be improved.

Further, the external control section can detect an abnormal state when a disk of a different type from the disk type specified by the mode selection signal is inserted, so that the above effect can be further improved.

[Brief explanation of drawings]

FIG. 1 shows a 3.5-inch floppy disk drive device of the present invention, and FIGS. 2 to 5 show 3.5-inch floppy disk drive devices according to an embodiment of the present invention. , Fig. 2 is an external view showing the floppy disk, Fig. 3 is a perspective view showing the main parts, Fig. 4 is a block diagram showing the schematic configuration, and Fig. 5 is a diagram showing the main parts in the block diagram of Fig. 4. It is a detailed circuit diagram. 21...disc, 22...hard jacket, 2
4... Window, 26... WP hole, 27... HD disk detection hole, 28... Spindle motor, 30... Stepping motor, 32... Carriage, 34... Head arm, 35a, 35b--Magnetic head, 37-
WP risk detection, 38...HD disk detector, 4o...
- Index detector, 41...control unit, 47...
Mode selection control circuit, 48... Head selection circuit, 49
···write. Readout circuit, 50...analog switch, 51a. 51b...Analog circuit, 52...Speed selector switch, 53...Motor drive control circuit, 59.63.64
゜68...Switching contact, 60a, 60b...Current limiting resistor, 65, a, 65 b-o-pass filter, 6
9a. 69b... Differential constant circuit. Applicant's representative Patent attorney Takehiko Suzue Procedural Amendment 11810 %1.11178 1. Indication of the case Japanese Patent Application No. 1983-109917 2. Name of Hikari Floppy Disk Drive II 3. Relationship with the person making the amendment Patent application Person (356) Tokyo Electric Co., Ltd. 4, Agent: 3-7-2 Kasumigaseki, Chiyoda-ku, Tokyo UBE Gorua,
Contents of amendment (1) The title of the invention is corrected as follows. Floppy disk drive device (2. The claims are corrected as shown in the attached sheet. (3 Mei II! Page 3, lines 9 to 12, [The present invention relates to...]) [The present invention relates to a floppy disk drive IAH that enables the use of two types of floppy disks with different magnetic recording densities.'' (4) On page 3, line 14 of the specification, ``plastic'' has been changed to ``for example, plastic (5) Correct "3.5-inch floppy disk" on page 5, line 7 of Akira M to "floppy disk." (6) Specification 1, page 5, lines 20 to 3. r in the first line of page 6
"HD disk detector" is corrected to "detector." (7) Ming [! Page 6, line 6, ``3.5-inch floppy disk J'' is corrected as [floppy disk]. (8) From page 6, line 9 of the specification to page 8, line 17 [
The present invention, as shown in FIG. 1, is a plan view. ” should be corrected as follows. DETAILED DESCRIPTION OF THE INVENTION As shown in FIG. 1, the present invention uses a magnetic head 3 to record information on the magnetic recording surface of a floppy disk 2 inserted into a disk insertion portion 1 while being housed in a jacket.
Analog circuit constants 6 in a write/read circuit 4.5 that executes read/write and is connected to the magnetic head 3
In a floppy disk drive device that makes it possible to use two types of floppy disks with different magnetic recording densities on the magnetic recording surface by changing the A detector 8 is provided to detect the detected detection hole 7, and an analog switch 9 writes based on the detection signal 10 from the detector 8. The analog circuit constant 6 of the readout circuit 4.5 is switched to the analog circuit constant 6 corresponding to the corresponding type. In addition to the above invention, in another invention, the abnormality notification means 11 determines that the floppy disk type designated by the mode selection signal 13 sent from the external control unit 2 is different from the floppy disk type detected by the detector 8. An abnormality signal 14 is sent to the external control unit 12 at this time. [Function] With the floppy disk drive device configured in this way, when a floppy disk of a type with a detection hole drilled in it is inserted into the disk insertion section, the detection hole is inserted into the jacket of the floppy disk of this type. The detected hole is detected by a detector, and an analog switch is operated by a detection signal from the detector, and analog circuit constants corresponding to the corresponding type of floppy disk are written and set in the RFT output circuit. Therefore, analog circuit constants corresponding to the type of floppy disk actually inserted are necessarily selected. In addition to the above-mentioned effects, another function of the invention is that if the type of floppy disk designated by the mode selection signal sent from the external control unit matches the type of floppy disk actually inserted into the disk insertion section. If not, an abnormality signal is sent to the external control unit. [Example] An example of the present invention will be described below with reference to the drawings. FIGS. 2(a) and 2(b) are plan views showing the front and back surfaces of a 3.5-inch floppy disk used when the floppy disk drive device of the embodiment is applied to a 3.5-inch floppy disk drive device. It is. 9) In the 7th line of page 19 of the specification, ``The disk 21 is the disk insertion section'' is corrected to ``The disk 21 is the disk insertion section.'' (10) On page 22, line 19 of the specification, "rHD disk detector" is corrected to "detector." (11) "Figure 1 shows..." in lines 10 to 13 of page 23 of the specification. 5 to 5 show 3 and 5 to which a floppy disk drive device according to an embodiment of the present invention is applied.
It refers to an inch floppy disk drive device.'' (12) Correct the first factor in the drawing as shown in the attached sheet. 2. Scope of Claims (1) A magnetic head writes and reads information on the magnetic recording surface of a floppy disk inserted in a jacket in a disk insertion section, and
By changing the analog circuit constants in the write and read circuits connected to the magnetic head, the magnetic recording density of the magnetic recording surface can be changed! ui In a floppy disk drive device that allows the use of two types of floppy disks, the 1his is provided in the disk insertion section;
-111 East A detector that detects the detection hole drilled in the jacket of the floppy disk, and the analog circuit constants of the write and read circuits are determined based on the detection signal from this detector.
− ° A floppy disk drive device characterized by comprising an analog switch for switching to an analog circuit constant. (2) The magnetic head writes and reads information on the magnetic recording surface of the floppy disk inserted into the disk insertion section while being housed in a jacket, and
By changing the analog circuit constants in the 1-include and VC output circuits connected to the magnetic head, magnetic recording on the magnetic recording surface can be achieved! In a floppy disk drive device that enables the use of floppy disks of 1112 types, the LLt
't2 (7) A detector that detects the detection hole drilled in the jacket of the floppy disk, and the analog circuit constants of the write and read circuits based on the detection signal from this detector. An analog switch that switches to a constant, and an abnormality that sends an abnormal signal to the external control section when the floppy disk 11 specified by the mode selection signal sent from the external ill 110 section and the floppy disk 11 detected by the detector are different. A floppy disk drive device comprising: notification means.

Claims (2)

[Claims] (1) A magnetic head writes and reads information to and from the magnetic recording surface of a 3.5-inch standard floppy disk inserted in a hard jacket into the disk insertion section, and the magnetic head By changing the analog circuit constants in the connected write and read circuits, two types of floppy disks can be used, the magnetic recording density of the magnetic recording surface being HD (high density) type and 2DD (double-sided double density) type. In the 3.5-inch floppy disk drive device, the HD disk detector is provided in the disk insertion portion and detects an HD disk detection hole drilled in the hard jacket of the HD type floppy disk; A 3.5-inch floppy disk drive characterized by comprising an analog switch that switches the analog circuit constants of the writing and reading circuits to analog circuit constants compatible with the HD type based on a detection signal from an HD disk detector. Device. (2) A magnetic head writes and reads information to and from the magnetic recording surface of a 3.5-inch standard floppy disk inserted in a hard jacket into the disk insertion section, and the magnetic head By changing the analog circuit constants in the connected write and read circuits, two types of floppy disks can be used, the magnetic recording density of the magnetic recording surface being HD (high density) type and 2DD (double-sided double density) type. In the 3.5-inch floppy disk drive device, the HD disk detector is provided in the disk insertion portion and detects an HD disk detection hole drilled in the hard jacket of the HD type floppy disk; an analog switch that switches the analog circuit constants of the write/read circuit to analog circuit constants compatible with the HD type based on a detection signal from the HD disk detector; and a floppy disk designated by the mode selection signal sent from the external control section. Disc type and HD
A 3.5-inch floppy disk drive device comprising: an abnormality notification means for sending an abnormality signal to the external control unit when the type of floppy disk is different from that detected by the disk detector.