JPH03225677A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To easily discriminate a format of a magnetic disk by comparing a track number accessed by a head with a track number to be regenerated from the loaded magnetic disk. CONSTITUTION:In a set mode, a track number accessed by the magnetic head 4 and a track number of the loaded magnetic disk 1 are read out, and whether they are coincident with each other or not is discriminated. Then, when these track numbers are coincident with each other, the present set mode is judged to be corresponding to a format of the loaded magnetic disk 1, and the recording/reproducing is executed in this mode. In the case of noncoincidence, the mode is changed, and the recording/reproducing is performed in the changed mode. By this method, which format is applied to the loaded magnetic disk 1 can easily be discriminated by comparing the track numbers.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a disc playback device using, for example, a 2-inch magnetic disc, and in particular, to a disc playback device that uses a 2-inch magnetic disc, and in particular, a disc playback device that determines which format the loaded disc is. It relates to a disc playback device that can play.

[Summary of the invention]

The present invention provides a first format disc in which linear track numbers are assigned to the tracks, and a second format disc in which track numbers are assigned with offsets for maintaining compatibility with the tracks. In a disk playback device in which a magnetic disk is installed, the type of disk installed can be determined by comparing the track number being accessed by the head and the track number being played from the installed magnetic disk. It is something.

[Conventional technology]

For example, JP-A-60-254463, JP-A-61-
As shown in Japanese Patent No. 51677, a data recording/reproducing device is known that records/reproduces digital data on a magnetic disk for still image recording having an outer diameter of 2 inches. Furthermore, portable document processing devices using such magnetic disks for recording still images with an outer diameter of 2 inches have become widespread.

Conventionally, such magnetic disks have a track pitch of 0.
．． 1 mm, and 50 annular trunks are formed. The track numbers are numbered (1) to (50) in order from the outer track to the inner track.

The recording capacity per track is 16 bits. Therefore, this type of magnetic disk can record data of 16 bits x 50 tracks = 819 bits per disk. A conventional magnetic disk having 50 tracks as described above is hereinafter referred to as a 1M byte disk.

In response, magnetic disks have been proposed in which the number of tracks is increased and the recording capacity is increased.

For example, 20 new tracks are added to the outer circumferential side of a conventional magnetic disk, and 20 new tracks are added to the inner circumferential side of the conventional magnetic disk. In this way, 40 new tracks are added to the conventional magnetic disk having 50 tracks, so the number of tracks becomes 90. When the number of tracks increases to 90, data of 16 bits x 90 tracks - 1.44 Mbits can be recorded on each disk. A disk having 90 tracks in this manner will be referred to as a 2 MB disk hereinafter.

[Problems to be Solved by the Invention] Development of a magnetic disk drive device that can handle 2M byte disks is progressing. A magnetic disk drive device that can handle 2M byte disks needs to be compatible with conventional 1M byte disks. That is, it is necessary to be able to perform recording/reproduction on a conventional 1 Mbyte disk using a magnetic disk drive device for a 2 Mbyte disk. Therefore, a format that takes into consideration compatibility with conventional 1 MB disks is being considered.

However, if a format is created that takes compatibility with 1MB disks into consideration, two types of magnetic disk formats will be created: a dedicated format that takes advantage of the characteristics of 2MB disks, and a format that takes compatibility into account. . Therefore, in a magnetic disk drive device for a 2 MB disk, it is necessary to be able to determine which format the installed magnetic disk is.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a disk playback device that can easily determine the format of a loaded magnetic disk.

[Means to solve the problem]

The present invention provides a first format disc in which linear track numbers are assigned to the tracks, and a second format disc in which track numbers are assigned with offsets for maintaining compatibility with the tracks. In a disk playback device in which a magnetic disk is installed, the type of disk installed is determined by comparing the trunk number accessed by the head and the track number played from the installed magnetic disk. It is a disc playback device.

[Effect]

In the 2M byte VF format, the tracks in the positions corresponding to the 1M byte disk have the same track number (
1) to (50) are assigned, track numbers (-19) to (0) are assigned to the outer tracks, and track numbers (51) to (70) are assigned to the inner tracks. 2M
In the byte VF format, linear track numbers (0) to (89) starting from 0 are assigned.

The track number accessed by the magnetic head 4 in the setting mode is compared with the track number of the mounted magnetic disk 1, and from this it is determined which formant the mounted magnetic disk 1 belongs to. be done. That is, when the setting mode and the format of the mounted magnetic disk 1 match, the track number accessed by the magnetic head 4 and the track number of the mounted magnetic disk 1 match.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of the IM byte disk DSCI. The IM bite disk DSCI has an outer diameter of 47 mm, and as shown in FIG. 1, the IM bite disk DSCI has 50 tracks Tr, l to Tr with a 0.1 mm pinch.

50 are arranged. Truck Tr+1 is located at a radius of 20 mm, and truck Tr+ 50 is located at a radius of 15.1 m.
It is located at m. This LM byte disk DSCI is
It has a data recording capacity of 819 bytes. Corresponding to the tracks Tr, 1 to Tr, 50, the trunk number (1
) to (50) are attached. The format for adding track numbers to a 1MB disk in this way is shown below.
It is called MB-byte VF format.

FIG. 2 shows the configuration of the 2 MB disk DSC2. The outer diameter of the 2MB disk DSC2 is IM
Like the bite disk DSCI, it is 47mm.

2M byte disk DSC2 is IM byte disk D
This corresponds to the addition of 20 new tracks on the outer and inner sides of the SCI. As shown in FIG. 2, 90 tracks Trzl to Trz90 are arranged at a pitch of 0.1 mm on the 2 MB disk DSC2. The outermost track Trzl is located at a radius of 22 mm, and the innermost track Tr, 90, has a radius of 13.1 m.
It is located at m. 21st track from the outermost track Trz
The 21st to 700th tracks Tr70 are tracks Tr, l to Tr+50 in the IM byte disk DSCI.
It is placed in a position corresponding to That is, the track Tr
, 21 is located at a radius of 20 mm, and the track Tr, 7
0 is located at a radius of 15.1 mm.

Track numbers are assigned to this 2M byte disk DSC2 in two types of formats. One is a format in which track numbers are assigned with offsets in consideration of compatibility with the IM byte VF format. This format is called a 2M byte VF format.

In this format, as shown in FIG. 3, for tracks Tr221 to Tr70, track numbers (1) to
(50) is attached, and the outer tracks Trzl~Tr
Track numbers (-19) to (0) are assigned to z20, and track numbers (51) to (70) are assigned to the inner tracks Trz71 to Trt90. By assigning track numbers in this way, the 1M byte disk DS
Since the tracks Tr, 21 to Trz70 located at positions corresponding to the tracks Tr+1 to Tr+50 in C1 have the same track numbers (1) to (50), compatibility is easily achieved.

Another format uses linear track numbers. Such a format will hereinafter be referred to as a 2M byte Floppy format. In this format, as shown in FIG.
, 70, consecutive track numbers starting from 0 (
0) to (89) are attached. Assigning such linear track numbers is particularly convenient for handling continuous data.

FIG. 5 shows these IM byte VF format, 2M byte VF format, and 2M byte Fl.

This shows the relationship between ppy formats. As shown in FIG. 5, when the 2M byte disk DSC2 is initialized in the 2M byte VF format, the track numbers of the corresponding tracks become equal to those of the 1M byte disk initialized in the IM byte VF format. Therefore, it is possible to record/reproduce IM byte disk DSCI in the IM byte VF format with a 2 Mbyte disk recording/reproducing device. That is, by using the 2MB VF format, upward compatibility can be completely maintained.

The track number is recorded in the track number area of the subframe and the track number area of the subcode, as shown in FIG.

That is, FIG. 6A shows the configuration of one track. One track is divided into four sectors as shown in FIG. 6A. Data is recorded in each sector as shown in FIG. 6B. The capacity of the data recording area is 4096
It's bit. A track number is recorded in the subframe of each sector, as shown in FIG. 6C.

Furthermore, subcodes are recorded in the subframe and data frame of each sector (FIG. 6D), as shown in FIG. 6E. A track number is recorded in this subcode as shown in FIG. 6F.

FIG. 7 shows an example of a disc recording/reproducing apparatus to which the present invention is applied.

In FIG. 7, 1 is a magnetic disk. This magnetic disk 1 is the aforementioned IM byte disk DSCI or 2M byte disk DSC2. The magnetic disk 1 is rotated by a spindle motor 2. A rotational drive signal is supplied to the spindle motor 2 from the mechanical controller 14 via the driver 3 .

4 is a magnetic head. The magnetic head 4 is movable in the direction of the magnetic disk 1 by a head feed motor 5. A drive signal is supplied to the head feed motor 5 from a mechanical controller 14 via a driver 6. The physical position of the magnetic head 4 is detected by a position detector 7. The output of this position detector 7 is supplied to a mechanical controller 14. From the output of this position detector 7,
The track number that the magnetic head 4 is accessing can be found.

Data from the host CPU 8 is supplied to the magnetic head 4 via the controller 9 and the RF signal processing circuit 10. Data is recorded on the magnetic disk 1 by the magnetic head 4 . The reproduction signal of the magnetic disk l is transmitted to the RF signal processing circuit 1.
0 is supplied to the host CPU 8 via the controller 9.

The host CPU 8 and the mechanical controller 14 are bidirectionally connected via the controller 9. Further, the host CPU 8 and the memory 11 are bidirectionally connected via the controller 9.

A keyboard 12 is connected to the CPU 8 as an input device. Further, a liquid crystal display 13 is connected as an output device.

Before using this magnetic disk recording/playback device,
The installed magnetic disk l is initialized. When the 2M byte disk DSC2 is installed as the magnetic disk 1, the 2M byte VF is loaded as described above during initialization.
Two formats can be selected: the floppy format and the 2M byte Floppy format.

When the 2 MB VF format mode is specified by operating the keyboard 12, each track is assigned a track number with an offset added for compatibility, as shown in FIG.

When specifying the mode of the 2M byte Floppy format, a linear track number is assigned to each track as shown in FIG.

This magnetic disk recording/reproducing device has one magnetic disk
A 1M byte disk in IM byte VF format, a 2 Mbyte disk in 2 Mbyte VF format, or a 2 Mbyte disk in 2 Mbyte Floppy format is mounted. At the time of playback, processing as shown in the flowchart of FIG. 8 is performed, and it is determined which format the loaded disc has.

That is, the track number of the mounted magnetic disk 1 is read in the currently set mode (step 21). Then, the track number being accessed by the magnetic head 4 in the set mode is compared with the read track number (step 22).

It is determined whether the track number being accessed by the magnetic head 4 in the set mode matches the read track number (step 23). If the track number being accessed by the magnetic head 4 in the set mode matches the read track number, the currently set mode corresponds to the format of the installed magnetic disk 1. It is determined that the mode is the same, and recording/reproduction of the magnetic disk 1 is executed in that mode (step 24).

In step 23, if the track number being accessed by the magnetic head 4 in the set mode is different from the read track number, the mode is changed (
Step 25). In other words, for example, if the mode is set to IM byte VF format, 2M byte V
If the mode is changed to F format and the mode is set to 2MB VF format, the mode is changed to 2MB F1opP)' format (2MB
If the mode is set to the byte F loppy format, it is changed to the IM byte VF format mode.

In the changed mode, the track number of the mounted magnetic disk 1 is read (step 26). Then, the track number being accessed by the magnetic head 4 in the changed mode is compared with the read track number (step 27).

It is determined whether the track number being accessed by the magnetic head 4 in the changed mode matches the read track number (step 28). If the track number being accessed by the magnetic disk 4 in the set mode matches the read track number, the process goes to step 24, where the recording/recording on the magnetic disk 1 is performed.
Playback is performed in that mode.

In step 23, if the track number being accessed by the magnetic head 4 in the set mode is different from the read track number, the process returns to step 25.
Mode is changed. At this time, it is determined whether all modes have been changed (step 29).

If the track number being accessed by the magnetic head 4 and the read track number do not match even after changing to all modes, a display will be displayed indicating that the mounted disk is not compatible (step 30). .

〔Effect of the invention〕

According to this invention, by comparing the track number accessed by the magnetic head 4 in the setting mode and the track number of the mounted magnetic disk 1, it is possible to determine which format the mounted magnetic disk 1 is in. You can determine if there is.

[Brief explanation of drawings]

Fig. 1 is a plan view of an example of a magnetic disk, Fig. 2 is a plan view of another example of a magnetic disk, Fig. 3 is a plan view used to explain an example of the format of a magnetic disk, and Fig. 4 is a plan view of an example of a magnetic disk. FIG. 5 is a plan view used to explain an example of the format, FIG. 5 is a route map used to explain an embodiment of the present invention, and FIG.
The figure is a route map used to explain the recording format of magnetic disks. FIG. 7 is a block diagram of an example of a magnetic disk recording/reproducing apparatus to which the present invention is applied, and FIG. 8 is a flowchart used to explain one embodiment of the present invention. Explanation of main symbols in the drawings DSCI: 1M byte disk. DSC2: 2MB disk. 1: Magnetic disk, 4: Magnetic spatula 8: Host CPU. 14: Mechanical controller. Do.

Claims (1)

[Claims] The first track has a linear track number.
The track number that the head is accessing in a disc playback device that is equipped with a second format disc and a second format disc that has a track number with an offset to maintain compatibility with the track. and a track number reproduced from the loaded magnetic disk to determine the type of the loaded disk.