JPH10172221A - Apparatus for magnetic recording/reproducing and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low price magnetic recording/reproducing apparatus having a simplified structure assuring compatibility for high density specification and low density specification. SOLUTION: Only one high density specification magnetic head 11U is provided to execute compatible data recording and reproducing to a loaded high density recording disc or low density recording disc 1L. When loading of low density recording disc 1L is identified, its recording track 2L is divided into a plurality of divided recording tracks suitable for the high density specification magnetic head 11U. To the predetermined number of divided recording tracks, the same data are respectively recorded by the high density specification magnetic head 11U and a guard track is also formed to the other divided recording tracks by recording none-data signal. As a whole, the data of the predetermined width can be recorded to the recording track 2L.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus in which a high-density recording magnetic disk and a low-density recording magnetic disk are shared, and a method of recording and reproducing data on these magnetic disks.

[0002]

2. Description of the Related Art For example, in a floppy disk drive, a flexible magnetic disk is driven to rotate at a relatively low speed, and data is recorded and read while a disk sliding surface of a magnetic head is in contact with the main surface. / Or playback (hereinafter,
It is simply called recording and playback. ), And has a feature that it is inexpensive and highly reliable.
The standard type floppy disk drive with extremely high penetration rate is
A magnetic disk having a diameter of 3.5 inches is used, and the storage capacity of data signals and the like of one magnetic disk is 1.44 Mbytes (720 Kbytes, 1.2 Mbytes, 1.6 Mbytes).
Magnetic disks with specifications such as bytes are also provided. ),
Data transfer rate is 250Kb / s (or 500Kb / s)
b / s) and the drive speed of the magnetic disk is 300 rpm or the like.

In a floppy disk device, a so-called single-sided type in which data is recorded and reproduced from one main surface of a magnetic disk by one magnetic head, and two magnetic disks are sandwiched between the main surfaces of the magnetic disk. There is provided a so-called double-sided type in which data is recorded / reproduced from both main surfaces by being opposed to each other. As shown in FIGS. 5 and 6, a double-sided floppy disk device 10 is supported by a disk support mechanism (not shown) and is arranged to face a pair of magnetic heads 11a and 11b (hereinafter referred to as a magnetic head 11). ). When the spindle motor is driven, the magnetic disk 1 is integrally driven to rotate by rotating the disk support mechanism via the spindle shaft.

The magnetic head 11 includes a magnetic gap 12 for recording and reproducing data on and from the magnetic disk 1.
However, as shown in FIG. 5 and FIG. 6, the recording tracks are arranged so as to be shifted by four (or eight) concentric recording tracks. The magnetic disk 1 has the magnetic gap 1
Since the same track number is assigned to both main surfaces corresponding to the two track deviations, data is simultaneously recorded and reproduced from both main surfaces by the magnetic head 11.

As shown in FIG. 5, the magnetic head 11 is configured by combining a head core member 13 having a magnetic gap 12 formed thereon, a slider member 14, and a coil member (not shown). The magnetic head 11 is a bulk type head of a tunnel erase type. A magnetic gap 12 formed on a disk sliding surface of a head core member 13 is used for reading / writing data from / on the magnetic disk 1. Write gap (R / W gap),
An erase gap (hereinafter, referred to as an E gap) which is located on both sides of the R / W gap and forms a non-data signal area for holding a guard band between recording data.
Consists of

Although the details of the head core member 13 are omitted, three ferrite materials each forming an R / W gap and an E gap are integrally joined in the thickness direction by a non-magnetic material such as molten glass. . The head core member 13 is provided with a gap groove, and the gap groove is filled with molten glass so that the head core member 13 is magnetically separated from the front and back with respect to the rotation direction of the magnetic disk 1 so that the above-described magnetic gaps 12 are respectively formed. It is formed.

A read / write core (not shown) is combined with the first head core member 13a at the center to form a read / write core, and its magnetic gap forms an R / W gap.
An erase core is formed by combining an erasing coil member (not shown) with the second head core member 13b and the third head core member 13c on both sides, and their magnetic gaps are located on both sides of the R / W gap. Construct the E gap.

The slider member 14 is made of a non-magnetic material, for example, a ceramic material having abrasion resistance and mechanical characteristics, and is formed in a substantially block shape. The slider member 14 has a magnetic disk 1 in the center area of the disk sliding surface.
The groove groove 14a parallel to the rotation direction of the disk is formed in the whole area, so that slider rails 14b and 14c, which are two areas parallel to each other, are formed on the disk sliding surface. The slider member 14 generates an airflow between its main surface and the disk sliding surface when the magnetic disk 1 is rotationally driven. One slider rail 1
4b, a head core member 13 is assembled with each magnetic gap facing the disk sliding surface. Also,
The other slider rail 14c has a flat disk sliding surface.

A floating force is applied to the magnetic head 11 in a direction away from the main surface of the magnetic disk 1 as shown by an arrow in FIG. Magnetic head 11
Thus, data is recorded / reproduced while being held slightly above the main surface of the magnetic disk 1, thereby preventing collision with the magnetic disk 1 when an impact or the like is applied.

[0010]

By the way, in the case of personal computers and the like, the number of applications and uses have been remarkably expanded by lowering the price and simplifying the operability, or by enriching the network, and the data handled accordingly. In addition, a wide range of data has been handled from multimedia data such as an image information data signal and a graphics data signal to a multimedia data such as a document data signal. Under such circumstances, in a personal computer and the like, standard equipment of a floppy disk device as a disk exchange type external storage device (removable disk device) is being studied.

As shown in FIG. 7, a conventional standard type floppy disk device (lower specification floppy disk device) 10L is loaded with a 3.5 inch floppy disk (magnetic disk for low density recording) having the above-mentioned specification. Recording and reproduction of data are performed by the low-density specification magnetic head 11L. In the low-density recording magnetic disk 1L, the track pitch WL of the recording track 2L is 187.5 microns, and data is recorded in a width of 60 microns to maintain compatibility, and the other is a guard track 3L.

The low-density specification magnetic head 11 has an R / W gap width of 131 microns,
The gap width of the E gap is 65 microns (or 71 microns). Therefore, in the lower specification floppy disk device 10L, data is recorded on the recording track 2L of the low density recording magnetic disk 1L by the wide low density specification magnetic head 11L, and the data recorded on the recording track 2L is reproduced. Do.

The lower specification floppy disk device 1
In the case of 0L, it was difficult to support a removable disk device of high-density recording specifications because of the specifications such as the storage capacity of the low-density recording magnetic disk 11L. Therefore, even in the extremely versatile floppy disk device 10, the data transfer rate is improved by recording data on the magnetic disk 1 at a high density and rotating the magnetic disk 1 at a high speed of several thousand rotations or more. Floppy disk device for high-density recording with a storage capacity of 100 Mbytes or more (upgrade floppy disk device)
A study of 10U is being planned.

The upper specification floppy disk drive 10
As shown in FIG. 8, a 3.5-inch high-density recording magnetic disk 1U, which is driven to rotate at a high speed, is loaded and a high-density specification magnetic head 11U is mounted as shown in FIG. Is provided. The high-density specification magnetic head 11U has a track pitch WU of the recording track 2U of 10 microns and a guard track 3U.
The track pitch GU of U is 10 microns. In the upper specification floppy disk device 10U, data is recorded on the recording track 2U of the high density recording magnetic disk 1U by the narrow high density specification magnetic head 11U, and the recorded data is reproduced.

In a floppy disk device, it is essential to have compatibility with lower specifications which are extremely versatile and to have compatibility with correspondence to higher specifications. For example, a floppy disk drive is a wide low-density specification magnetic head 11L.
This can be achieved by providing two types of magnetic heads, namely, a magnetic head 11U having a narrow and high-density specification. The floppy disk drive can be realized by providing a so-called composite magnetic head having two functions of a low-density specification magnetic head 11L and a high-density specification magnetic head 11U.

However, the floppy disk drive provided with the two types of magnetic heads described above has a complicated and large head and a large weight, so that the seek time is long and the processing of wiring and the like is troublesome, and the assembly is difficult. However, there is a problem that the cost is increased due to an increase in the number of steps such as. Further, the above-mentioned floppy disk drive having the composite magnetic head has a problem that an expensive and complicated special magnetic head having a head core member having a plurality of magnetic gaps is required.

Accordingly, the present invention has been proposed for the purpose of providing an inexpensive magnetic recording / reproducing apparatus having a simple structure and compatibility between low-density recording specifications and high-density recording specifications.

Another object of the present invention is to provide a magnetic recording / reproducing method capable of recording / reproducing data with compatibility between a low-density recording magnetic disk and a high-density recording magnetic disk. It is a thing.

[0019]

According to the present invention, there is provided a magnetic recording / reproducing apparatus in which a magnetic disk for high-density recording and a magnetic disk for low-density recording are used in common. A high-density magnetic head with a narrow magnetic gap that matches the track width, a magnetic head drive mechanism that supports the high-density magnetic head and drives it in the tracking direction, and rotationally drives the loaded magnetic disk A data processing unit for processing read data reproduced from a magnetic disk loaded by the high-density specification magnetic head and supplying recording data to the high-density specification magnetic head; Disk is identified by identifying whether the magnetic disk is a high-density recording magnetic disk or a low-density recording magnetic disk. A magnetic disk identification unit for transmitting a signal, and a disk identification signal transmitted from the magnetic disk identification unit is processed to output to a magnetic head driving mechanism, a magnetic disk driving mechanism, a data processing unit, or the like a high density recording compatible output or a low density recording. And a control unit for sending a corresponding output.

According to the magnetic recording / reproducing apparatus of the present invention configured as described above, when a high-density recording magnetic disk is loaded, the magnetic head is recorded from the recording track by the high-density recording specification magnetic head. The data is played,
Alternatively, data is recorded on a recording track. Also,
When a magnetic disk for low-density recording is loaded, a magnetic head drive mechanism controlled by a low-density recording-compatible output from a control unit causes the magnetic head to have a high-density recording specification magnetic head part of a wide recording track. Data is recorded by reproducing the data recorded at the drive position, or by recording the same data a plurality of times on a wide recording track.

Further, the magnetic recording / reproducing method according to the present invention, which achieves the above-mentioned object, uses a high-density specification magnetic head in which a narrow magnetic gap adapted to a recording track width of a high-density recording magnetic disk is formed. Then, the loaded magnetic disk is identified by the magnetic disk identification unit as either a high-density recording magnetic disk or a low-density recording magnetic disk.

According to the magnetic recording / reproducing method of the present invention, data recorded on a high-density recording magnetic disk from a narrow recording track by a high-density specification magnetic head is reproduced. Data is recorded on the recording track. According to the magnetic recording / reproducing method,
For a low-density recording magnetic disk, a high-density specification magnetic head is positioned on a part of the wide recording track to reproduce recorded data, and this recording track is adjusted to the magnetic gap width of the magnetic head. It is divided into a plurality of recording tracks having an appropriate track width, and a plurality of recordings of the same data are performed on these divided recording tracks.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. A floppy disk drive 10 shown in FIG. 1 as an embodiment of a magnetic recording / reproducing apparatus according to the present invention includes a high-density recording magnetic disk 1U having an outer diameter of 3.5 inches and a low-density recording magnetic disk 1L. Enables compatible use. The floppy disk drive 10 has a pair of magnetic heads 11a, 1a opposed to each other with the main surface interposed therebetween.
1b (hereinafter collectively referred to as a magnetic head 11) constitutes a so-called double-sided floppy disk drive in which data is recorded and reproduced from both main surfaces of the magnetic disk 1.

The magnetic disk 1 is rotatably housed in the disk cartridge 4, and when loaded into the floppy disk device 10, the shutter 5 is opened to expose the front and back main surfaces. The disk cartridge 4 has a disk identification display section 6 for identifying whether the built-in magnetic disk 1 is a high-density recording magnetic disk 1U or a low-density recording magnetic disk 1L. I have. Although not described in detail, the disc identification display section 6 is composed of an identifier switched to two positions and an identification hole opened and closed by the identifier.

The magnetic disk 1U for high density recording is
As described above, the track pitch WU of the recording track 2U
Is 10 microns, and the track pitch GU of the guard track 3U is 10 microns. As described above, the low-density recording magnetic disk 1L has a track pitch WL of 18
The width is 7.5 μm, data is recorded at 60 μm to maintain compatibility, and the other is a guard track 3L.

The floppy disk drive 10 includes a pair of upper and lower magnetic heads 11, a magnetic disk drive mechanism 20 that supports and rotates the magnetic disk 1, and a magnetic head support mechanism 21 that supports the magnetic head 11. . Further, the floppy disk device 10 includes a main control unit 22 and
An interface unit 23, a magnetic disk identification unit 24,
Magnetic disk drive controller 25 and magnetic head controller 26
And a control circuit such as a data processing unit 27. The magnetic disk drive mechanism 20 includes a disk table 28 that magnetically chucks the center hub 7 of the loaded magnetic disk 1, and a spindle that is driven to rotate by fixing the disk table 28 to one end of an output shaft (spindle shaft) 30. It is constituted by a motor 29 and the like. The spindle motor 29 is controlled by a magnetic disk drive control unit 25 described later.

The magnetic head 11 is a magnetic head 11U used for high-density recording and reproduction. Although not described in detail, for example, a metal film is sputtered in a gap groove formed in a head core material 13 made of a polycrystalline ferrite material. A metal-in-gap head in which the magnetic gap 12 is formed by forming a film by a method or the like is used. Of course, the magnetic head 11U may use the tunnel erase type bulk type head described above. The magnetic head 11U is configured such that the gap width of the magnetic gap 12 is substantially equal to the recording track 2U of the high-density recording magnetic disk 1U described later. The magnetic head 11U is subjected to high-accuracy tracking servo by a magnetic head control unit 26 described later.

The magnetic head 11U is formed by joining the above-described head core material 13 to the slider member 14 with molten glass or the like. The slider member 14 is made of a non-magnetic ceramic material such as calcium titanate, which is excellent in wear resistance, sliding resistance and mechanical properties. Slider member 1
4 is a slider rail 14 whose surface is formed as a disk sliding surface, and whose groove grooves 14a are recessed in parallel with the running direction of the magnetic disk 1 so as to be parallel to each other.
b, 14c are formed. The slider member 14 includes
The head core member 13 is joined with the magnetic gap 12 facing the disk sliding surface of one slider rail 14b.

When the loaded magnetic disk 1 is identified as the high-density recording magnetic disk 1U as described later, the magnetic disk drive mechanism 20
5 to control the output of the high-density recording magnetic disk 1.
U is driven to rotate at a high speed of, for example, 1200 rpm to 3600 rpm. Further, the magnetic disk drive mechanism 20 is configured so that the loaded magnetic disk 1 is a low-density recording magnetic disk 1.
L, the low-density recording magnetic disk 1L is controlled by the output of the magnetic disk drive control unit 25 to 3
It is driven to rotate at a low speed of 00 rpm. The magnetic disk drive mechanism 20 may rotate the magnetic disk 1 at a high speed of, for example, 1200 rpm to 3600 rpm, regardless of the type of the magnetic disk 1.

The magnetic head support mechanism 21 includes the carriage 3
1 and a pair of members such as a pair of gimbal springs 32, one end of which is supported by the carriage 31 and the other end of which supports the magnetic head 11U. The magnetic head support mechanism 21 supports the loaded magnetic disk 1 such that the magnetic head 11U is kept in contact with the front and back main surfaces. Magnetic head support mechanism 21
Supports the magnetic head 11U with respect to the magnetic disk 1 such that the magnetic gaps 12 thereof are shifted from each other by four tracks or eight tracks.

When the magnetic disk 1 is driven to rotate and a floating force is applied to the magnetic head 11U, the magnetic head support mechanism 21 moves the magnetic head 11U to the gimbal spring 3A.
2, the magnetic disk 1 is held in a pseudo contact state slightly floating above the main surface. Magnetic head support mechanism 2
1 is driven in the tracking direction via the magnetic head control unit 26 based on a control signal sent from the main control unit 22. The magnetic head 11U is thereby positioned on a predetermined recording track 2 of the magnetic disk 1. Since the same track number is given to the recording tracks 2 on both main surfaces of the magnetic disk 1 in correspondence with the above-mentioned track deviation, the magnetic head 11 simultaneously records and reproduces data from both main surfaces. .

The main control section 22 reads the recording data and the recording position information from the interface section 23. This recording position information is stored in the low-density recording magnetic disk 1 as described later.
This is position information on the recording track 2L when data is recorded on L. The magnetic disk identification information identified by the magnetic disk identification unit 24 is input to the main control unit 22. The main controller 22 outputs a drive signal to the magnetic disk drive controller 25 based on the magnetic disk identification information. The main controller 22 outputs a drive signal to the magnetic head controller 26 based on the magnetic disk identification information. The main control unit 22 outputs a data processing signal to the data processing unit 27 and outputs a non-data processing signal. The main control unit 22 performs other control operations in the same manner as the main control unit of the conventional floppy disk device.

The interface unit 23 constitutes an interface between the floppy disk drive 10 and the host system, and comprises a signal interface and a power supply interface, although their details are omitted. Interface unit 23
Generates the position information of the recording data on the low-density recording magnetic disk 1L, as described above, by inputting the magnetic disk identification information from the main control unit 22. The other basic configuration of the interface unit 23 is the same as that of the conventional floppy disk device.

The magnetic disk identification unit 24 includes, for example, an optical detector including a light emitting element and a student element which are positioned opposite to the disk identification display unit 6 of the loaded disk cartridge 4. The magnetic disk identification unit 24 is driven by a drive signal output from the main control unit 22, and identifies the setting state of the disk identification display unit 6 of the loaded disk cartridge 4 by the optical detector. When the magnetic disk identification unit 24 identifies the presence or absence of the identification hole of the disk identification display unit 6, the magnetic disk 1 mounted on the main control unit 22 determines whether the magnetic disk 1 mounted on the main control unit 22 is the magnetic disk 1U for high density recording or the magnetic disk 1L for low density recording. Is output.

The magnetic disk drive controller 25 is rotationally driven by a drive signal from the main controller 22 based on magnetic disk identification information. The magnetic disk drive control unit 25
When the magnetic disk 1U for high-density recording is loaded, the magnetic disk 1U for high-density recording is for example 1200 rpm.
The spindle motor 29 is controlled so as to be driven to rotate at a high speed of m to 3600 rpm. In addition, when the low-density recording magnetic disk 1L is loaded, the magnetic disk drive control unit 25 controls the spindle motor 29 so that the low-density recording magnetic disk 1L is driven to rotate at a low speed of, for example, 300 rpm. . The magnetic disk drive control unit 25 feeds back drive information of the low-density recording magnetic disk 1L to the main control unit 22.

The magnetic head control unit 26 drives the magnetic head drive mechanism 21 in response to a drive signal from the main control unit 22 to move the magnetic head 11U in the tracking direction. Further, when the low-density recording magnetic disk 1L is loaded, the magnetic head control unit 26 drives the magnetic head driving mechanism 21 with a drive signal based on the magnetic disk identification information from the main control unit 22 to perform the magnetic head 11U. Is moved in the tracking direction within the same recording track 2 of the low-density recording magnetic disk 1L.

The data processing unit 27 encodes the data supplied from the interface unit 23 via the main control unit 22 so as to conform to the format of the magnetic disk 1. The data processing unit 27 decodes data reproduced from the magnetic disk 1 by the magnetic head 11U and sends the data to the interface unit 23. Data processing unit 27
Performs data processing on the basis of a data processing signal or a no-data processing signal supplied from the main control unit 22, and performs recording processing on the recording track 2
And a guard track 3 is formed. When the low-density recording magnetic disk 1L is loaded, the data processing unit 27 generates data corresponding to the divided recording tracks 8, which will be described later, and causes the magnetic head 11U to record the same data on these divided recording tracks 8.

The above-described magnetic head 11U is constructed by integrally joining and fixing the head core member 13 and the slider member 14, but the slider member 14 is provided with a core mounting hole, and the core mounting hole is provided in the core mounting hole. An embedded magnetic head in which the member 13 is embedded so as to be embedded may be used.

When the disk cartridge 4 is loaded in the floppy disk drive 10 constructed as described above, the magnetic disk identification section 24 located opposite the disk identification display section 6 causes the high-density recording magnetic disk 1U.
And the low-density recording magnetic disk 1L.
The magnetic disk identification unit 24 outputs the magnetic disk identification information to the main control unit 22 as described above. When the low-density recording magnetic disk 1L is loaded, the floppy disk device 10 supplies the magnetic disk identification information to the interface unit 23 via the main control unit 22. The floppy disk device 10 is set to, for example, a recording mode or a reproduction mode based on a mode signal supplied from the interface unit 23 to the main control unit 22.

In the floppy disk drive 10, when the high-density recording magnetic disk 1U is loaded in the recording mode, the main control unit 22 reads the recording data from the interface unit 23 and sends it to the data processing unit. 27. The data processing unit 27 subjects the recording data to encoding processing conforming to the format pattern of the high-density recording magnetic disk 1U and supplies it to the magnetic head 11U.
The data is recorded on the U recording track 2U. Further, in the floppy disk device 10, the drive signal is supplied from the main control unit 22 to the magnetic disk drive control unit 25,
As a result, the spindle motor 29 of the magnetic disk drive mechanism 20 is driven, and the magnetic disk 1U for high-density recording is rotationally driven at a high speed of, for example, 1200 rpm to 3600 rpm.

In the floppy disk drive 10, when the high-density recording magnetic disk 1U is loaded, a drive signal is sent from the main control unit 22 to the magnetic head control unit 26. The magnetic head control unit 26 performs tracking servo of the magnetic head drive mechanism 21 by this,
As shown in FIG. 2, the magnetic gap 1 of the magnetic head 11U is
2 is a recording track 2U of the magnetic disk 1U for high density recording.
And the high-density recording of the data is performed at the corresponding position.

The floppy disk device 10 reproduces data recorded on the recording track 2L by the magnetic head 11U from the loaded high-density recording magnetic disk 1U in the state where the reproduction mode is set. The magnetic head 11U is subjected to high-accuracy tracking servo by the magnetic head control unit 26 and supplies reproduced data to the data processing unit 27. The data processing unit 27 decodes the reproduced data and outputs the decoded data to the interface unit 23 via the main control unit 22.

The floppy disk drive 10 has a conventional recording operation and a reproducing operation other than the operation of each unit based on the corresponding magnetic disk identification information of the high density recording magnetic disk 1U identified by the magnetic disk identification unit 24. The recording operation and the reproducing operation of the floppy disk device are almost the same.

When the low-density recording magnetic disk 1L is loaded in the floppy disk device 10 in the recording mode, the main control unit 22 transmits the recording data from the interface unit 23 based on the magnetic disk identification information. Reading with the recording position information is performed. The recording position information is position information for recording data on the recording track 2L of the low-density recording magnetic disk 1L. In other words, in the low-density recording magnetic disk 1L, each wide recording track 2L is configured as a plurality of narrow divided recording tracks 8, respectively. Although the divided recording tracks 8 are shown as five tracks in FIG. 3 for convenience of explanation, they are actually divided into 19 tracks.

The main control section 22 decodes the recording position information and records the recording tracks 2L on the low-density recording magnetic disk 1L.
And the position information of the divided recording track 8 in the recording track 2L is determined. The floppy disk device 10 sends the [recorded track 2L + 10 microns × N (N =
-9, -8,..., 8, 9)] are supplied to the magnetic head controller 26. Magnetic head controller 2
6 is a magnetic head drive mechanism 2 which is driven by the drive control signal.
1 to move the magnetic head 11U to a position corresponding to the predetermined divided recording track 8.

In the floppy disk device 10, a control signal is supplied from the main control unit 22 to the data processing unit 27, and the data processing unit 27 generates a non-data signal. The floppy disk drive 10 supplies the non-data signal from the data processing unit 27 to the magnetic head 11U, and supplies the signal to the magnetic head 11U with the width of the magnetic gap 12 of 10 microns.
By performing data-free recording on each of the divided recording tracks 8, the data recorded on the recording track 2L is erased over the entire area.

On the other hand, after the data erasing operation, the floppy disk device 10 sends the following message from the main control unit 22 to [Determined recording track 2L + 10 microns × N (N = −2.5, −1.
,... 1.5, 2.5)] is supplied to the magnetic head control unit 26. Magnetic head controller 26
The magnetic head drive mechanism 21 is controlled by the drive control signal.
To move the magnetic head 11U to a position corresponding to a predetermined divided recording track 8.

The floppy disk drive 10 sends the read record data from the main control unit 22 to the data processing unit 2.
7 to perform an encoding process conforming to the format pattern of the low-density recording magnetic disk 1L. The recording data is recorded on the low-density recording magnetic disk 1L by the magnetic head 11U whose tracking is controlled to a predetermined divided recording track 8 from the data processing unit 27. The floppy disk device 10 controls the magnetic head 11U by the magnetic head control unit 26, and the same as six adjacent divided recording tracks 8 among the nineteen divided recording tracks 8 for the low-density recording magnetic disk 1L. The same data is recorded at the timing of.

In the low-density recording magnetic disk 1L, data is recorded with a width of 60 microns in the recording track 2L by the above-described recording operation, and the other divided recording tracks 8 are recorded with no data signal. To form the guard track 3L. Therefore,
Since the low-density recording magnetic disk 1L has recording data recorded in a predetermined width in the recording track 2L, even when the low-density recording magnetic disk 1L is used in the lower specification floppy disk device 10L, the wide low-density specification magnetic head 11L is used. Reproduction of the recorded data is reliably performed.

In the above-mentioned floppy disk drive 10, the data-free signal is first recorded on the low-density specification magnetic head 11L in the entire area of 190 microns in the recording track 2L, and then the data is recorded in the area of 60 microns. Recording was performed. For example, after a data recording area was formed by first performing data recording six times, a non-data signal was recorded seven times in a range of 65 microns on both sides of the data recording area to form the guard track 3. It may be formed.

The floppy disk drive 10 can perform not only the above-described data recording method on the low-density recording magnetic disk 1L but also data recording in a format as shown in FIG. 4, for example. That is, the floppy disk drive 10 is used for the low-density recording magnetic disk 1.
L recording track 2L is recorded on magnetic recording head 2U by magnetic head 11U.
It is characterized in that the type of data is recorded.

On the low-density recording magnetic disk 1L, for example, for each of the 19 divided recording tracks 8,
Two divided recording tracks 8 at both ends (8-1, 8-18)
And two divided recording tracks 8 (8-9, 8-1) at the center.
0) to form guard tracks 3a, 3b and 3c. As shown in FIG. 4, the low-density recording magnetic disk 1L has guard tracks 3a and 3b on both sides that constitute a guard track 3 with another recording track 2, and a central guard track 3c that is a recording track 2c. , Two individual recording tracks 9a and 9b are formed.

On the low-density recording magnetic disk 1L, different data is recorded on the individual recording tracks 9a and 9b by the floppy disk device 10.
In this case, the same data is recorded on the individual recording tracks 9a and 9b at the same timing.

The floppy disk drive 10 further includes a magnetic head 11U and includes a low-density recording magnetic disk 1L.
For example, by recording data on and reproducing the recorded data,
In L, it is possible to record and reproduce two types of data of low density recording specification and data of high density specification.

[0055]

As described in detail above, according to the magnetic recording / reproducing apparatus of the present invention, one magnetic head having a high-density specification is provided, and when a magnetic disk for low-density recording is loaded, the recording is performed. By dividing a track into a plurality of divided recording tracks and recording the same data on a predetermined number of divided recording tracks, when this low-density recording magnetic disk is loaded in a lower specification recording / reproducing apparatus, This enables reproduction by the low-density specification magnetic head. Therefore, the magnetic recording / reproducing apparatus achieves compatibility between the low-density recording magnetic disk and the high-density recording disk, has a simple head structure, suppresses an increase in weight, and reduces the number of parts and the number of assembly steps. Cost can be reduced, and performance can be improved by shortening the seek time.

Further, according to the magnetic recording / reproducing method of the present invention, the recording track is divided into a plurality of parts on a low-density recording magnetic disk loaded by one high-density specification magnetic head. Since the same data is recorded on a predetermined number of divided recording tracks of the recording tracks, even when this low-density recording magnetic disk is loaded in a lower specification recording / reproducing apparatus, reproduction by the low-density specification magnetic head is performed. Make it possible. According to the magnetic recording / reproducing method, a magnetic recording / reproducing apparatus having compatibility between a low-density recording magnetic disk and a high-density recording disk can be configured simply and inexpensively, and data recording can be performed. Versatility improves usability.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory diagram of a lower specification / higher specification compatible floppy disk device shown as an embodiment of a magnetic recording / reproducing apparatus according to the present invention.

FIG. 2 is a schematic diagram of a recording / reproducing operation of data on a magnetic disk for high density recording by the floppy disk device.

FIG. 3 is a schematic diagram of a data recording / reproducing operation on a low-density recording magnetic disk by the floppy disk device.

FIG. 4 is a schematic diagram of another data recording / reproducing operation on the low-density recording magnetic disk by the floppy disk device.

FIG. 5 is a longitudinal sectional view of a main part of the floppy disk device.

FIG. 6 is a schematic diagram of an operation of recording and reproducing data from a magnetic disk by a floppy disk device.

FIG. 7 is a schematic diagram of an operation of recording and reproducing data on a low-density recording magnetic disk by a lower specification floppy disk device.

FIG. 8 is a schematic diagram of a data recording / reproducing operation on a low-density recording magnetic disk by a higher specification floppy disk device.

[Explanation of symbols]

1 magnetic disk, 1L magnetic disk for low density recording,
1U high-density recording disk, 2 recording tracks, 3 guard tracks, 6 disk identification display section, 10 floppy disk device (magnetic recording / reproducing device), 11 magnetic head, 11L low-density magnetic head, 11U high-density magnetic head, Reference Signs List 12 magnetic gap, 13 head core member, 14 slider member, 20 magnetic disk drive mechanism, 21 magnetic head drive mechanism, 25 main control section, 26
Interface unit, 27 magnetic disk identification unit, 28
Magnetic disk drive controller, 29 data processor

Claims (6)

[Claims] 1. A magnetic recording / reproducing apparatus in which a high-density recording magnetic disk and a low-density recording magnetic disk are shared, wherein a narrow magnetic gap is formed to fit a recording track width of the high-density recording magnetic disk. A high-density specification magnetic head, a magnetic head drive mechanism for supporting the high-density specification magnetic head and driving in the tracking direction, a magnetic disk drive mechanism for rotatingly driving the loaded magnetic disk, A data processing unit for processing reproduction data reproduced from the magnetic disk loaded by the head and supplying recording data to the high-density specification magnetic head; and a magnetic disk for high-density recording. Or low-density recording magnetic disk and sends a disk identification signal. And a control unit for processing a disk identification signal sent from the magnetic disk identification unit and sending an output corresponding to high-density recording or an output corresponding to low-density recording to the magnetic head driving mechanism, magnetic disk driving mechanism, data processing unit, or the like. The high-density specification magnetic head is configured such that when a low-density recording magnetic disk is loaded, the magnetic head driving mechanism that is driven and controlled by a low-density recording corresponding output from the control unit has a wide recording track. A magnetic recording / reproducing apparatus, which reproduces data recorded by being driven at a part of the same or performs plural recordings of the same data in different areas of a wide recording track. 2. The magnetic head according to claim 1, wherein the high-density specification magnetic head forms a guard track by recording no-signal data in both end regions of a recording track of the low-density recording magnetic disk. 3. The magnetic recording and reproducing device according to claim 1. 3. The high-density specification magnetic head forms a plurality of guard tracks by recording no-signal data in a plurality of areas in a recording track of a magnetic disk and a plurality of areas divided by the guard tracks. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein data is recorded at different recording densities. 4. A high-density specification magnetic head in which a narrow magnetic gap adapted to a recording track width of a high-density recording magnetic disk is used. Either a high-density recording magnetic disk or a low-density recording magnetic disk is identified, and the high-density recording magnetic disk is recorded from the narrow recording track adapted by the high-density specification magnetic head. The data is recorded on this recording track, and the data is recorded on the low-density recording magnetic disk by positioning the high-density magnetic head on a part of the wide recording track. Data, and divides this recording track into a plurality of recording tracks having a track width suitable for the magnetic gap width of the magnetic head. A magnetic recording / reproducing method, wherein the same data is recorded on each of the divided recording tracks. 5. A guard track is formed by recording no-signal data on at least both-side divided recording tracks of the divided recording tracks of the low-density recording disk by the high-density specification magnetic head. The magnetic recording / reproducing method according to claim 4, wherein 6. A plurality of guard tracks are formed by recording no-signal data on a plurality of divided recording tracks of the low-density recording disk by the high-density specification magnetic head, and between the guard tracks. 5. The magnetic recording / reproducing method according to claim 4, wherein data is recorded on the divided recording tracks having different recording densities.