JPH04252470A - Disk and disk reproducing device - Google Patents

Abstract

PURPOSE:To record and reproduce information groups with different attributes such as sound information, video information, and digital data, etc., on one disk. CONSTITUTION:Data areas 2, 3 on which the information groups with different transfer speed such as sound and video, etc., are recorded are provided at the disk 1 which performs the recording/reproduction of information, respectively. Also, a disk control area 4 is provided at the innermost periphery of the disk 1, and a read head detects data recorded on the area first. After that, the head is moved to a targeted data area, and reads out the information after a system control part sets the rotating speed of the disk at a regulation value.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc on which various types of information such as audio, video, and data are mixedly recorded, and a disc reproducing apparatus for reproducing the disc.

0002

[Prior Art] Conventionally, when a computer handles multiple pieces of information with different characteristics, such as audio and video, it is common to connect disk drive devices around the computer according to each type of information and control them separately. Met. For example, a compact disc player is often used to reproduce audio information, a video disc player is used to reproduce video information, and a hard disc drive or the like is usually connected to a computer to reproduce digital data.

0003

However, in such a conventional configuration, a disc for audio, a disc for video, and a disc for data are required, each having a different size and operating method. In addition, each disk drive device corresponding to the disk drive device is required, which causes problems in that handling is complicated, the physical shape of the entire system becomes large, and unified processing is difficult. Furthermore, in order to simplify the overall system configuration, for example, if audio information and video information are mixed on one disk, the transfer speed and address system of each information will be significantly different, so There was a problem that the current disk control technology could not handle the problem.

[0004] The present invention was made in view of these conventional problems, and makes it possible to reduce these complications, perform unified operations, and collect various information without using multiple types of devices. The technical challenge is to make it playable.

[0005]

[Means for Solving the Problems] The invention as set forth in claim 1 of the present application is a disc for recording and reproducing information, which has a plurality of data areas and at least one disc control area on the recording and reproducing surface of the disc. Each data area is an area in which a group of information with the same attribute is recorded and reproduced at a prescribed transfer rate, and the disk control area contains transfer rate data for reproducing the information group of each data area, This area is characterized in that it is an area that holds recording position data of each information group on the disc.

The invention according to claim 3 of the present application is a disc for recording and reproducing information, in which a plurality of data areas for recording information groups of the same attribute are formed on the recording and reproducing surface of the disc, and each data area has: It has a first data area located at the beginning of the data area and a second data area located following the first data area, and the second data area is information that is reproduced at a specified transfer rate. The first data area is an area where a group of information is recorded, and the first data area is an area where transfer speed data of the information group of the second data area is recorded.

The invention according to claim 4 of the present application is the disc according to claim 3, characterized in that an empty area in which no information is recorded is provided between the first data area and the second data area. That is.

The invention according to claim 6 of the present application is a disc playback device for reading information recorded on the disc according to claim 1 or 2, which comprises: a spindle motor of the disc;
A motor drive unit that rotates at a rotation speed corresponding to a specified transfer speed, a head that reads information in a disk control area and a data area recorded on the disk, and a traverse drive unit that traverses the head to a specified recording position. , a signal processing unit that separates and holds information in the disk control area and data area read from the head, and a signal processing unit that separates and holds the information in the disk control area and data area read from the disk, and the transfer rate and recording position values of each information group read from the disk control area of the disk The system includes a memory section for holding, an information separation section that separates information in a data area output from the signal processing section according to the attributes of the information group, and a system control section that operates based on an external command signal. The control section outputs the recording position data from the signal processing section, causes the head to traverse to the reading position via the traverse drive section, and also sends the data area information from the signal processing section to the information separation section to separate the information group. Sort according to the attributes of
The present invention is characterized in that the rotational speed of the spindle motor is maintained at a specified value via the motor drive section in accordance with transfer speed data from the signal processing section.

[0009] The invention described in claim 7 of the present application is based on claim 3,
or a disc playback device for reading information recorded on a disc according to item 4, comprising: a motor drive unit that rotates a spindle motor of the disc at a rotational speed corresponding to a specified transfer speed; and a data area recorded on the disc. A head that reads information, a traverse drive unit that traverses the head to a prescribed recording position, a signal processing unit that separates and holds information in the data area read from the head, and a signal processing unit that separates and holds information read from the first data area of the disk. A memory section that holds the transfer rate of each output information group, an information separation section that separates information in the second data area output from the signal processing section according to the attributes of the information group, and a transfer rate from the information separation section. The system includes an information storage section that holds each information group, and a system control section that operates based on an external command signal. At the same time, the data area information from the signal processing section is sent to the information separation section, where it is distributed according to the attributes of the information group, and the spindle motor is moved according to the transfer speed data from the signal processing section. The invention is characterized in that the number of rotations of is maintained at a specified value via a motor drive section, a clock signal is sent to an information storage section, and information is output from the information storage section at a specified transfer speed.

0010

[Operation] Claims 1 and 2 of the present application having such features
According to the invention, by using a head to read the transfer speed of each information group recorded in the disk control area and the recording position of each information group in the data area on the disk, it is possible to determine which area on the recording/playback surface of the disk is the same. It can be seen whether a group of information having attributes is recorded. By holding the signal read from this disk control area, when reading a necessary information group, the rotation speed of the disk is set according to the data area, so that the head can immediately traverse to the reading position. Further, according to the third aspect of the present invention, by simply reading the data area recorded on the disc, it is possible to know the attributes of the information group recorded therein and the number of revolutions of the disc required for reproduction. This eliminates the need for the disk control area described in claims 1 and 2. According to the invention of claim 4, the number of rotations of the disk is determined within the time it takes to scan the empty area until the head moves to the second data area at the same time as reading the specified number of rotations of the disk from the first data area. It reaches the rotation speed of
A memory for temporarily storing information in the second data area is not required. Next, according to the invention of claim 6 of the present application, when reading the information recorded on the disk according to claim 1 or 2, the data area to be read by first scanning the disk control area is determined from which area on the disk. You can see if the location is recorded. Next, the head is caused to traverse to the recording position detected in the disk control area, and information is output at a specified transfer rate. Further, according to the invention of claim 7 of the present application, when reading the information recorded on the disk according to claim 3 or 4, scanning is first started from the innermost circumference of the disk and information in each data area is read. . The attributes and transfer speed of the information group are detected from the first data area, and the target information group is read from the second data area. Next, the number of revolutions of the disk is controlled to a value output from the memory section, and information groups are separated according to their attributes and temporarily stored in the information storage section. When the disk reaches a specified number of rotations, this information is output using a clock signal.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing the structure of a disk according to a first embodiment of the present invention. In this figure, a disk 1 is provided with data areas 2 and 3 which are recorded at different transfer speeds, and other data areas not shown in this figure are also provided. Addresses 2A and 3A indicate the recording positions of the head portions of data areas 2 and 3, respectively. Further, a disk control area 4 is provided at the innermost circumference of the disk 1. The disk control area 4 is an area that holds the transfer speeds of all data areas including data areas 2 and 3 on the disk 1 and an address indicating the start position of each data area. For example, in this embodiment, the disk rotation speed corresponding to the transfer speed of each data area such as data areas 2 and 3, and an address indicating the recording position of the beginning of each data area are recorded in the disk control area 4. ing.

FIG. 2 is a block diagram of a disc reproducing apparatus for reproducing the disc 1 described in FIG. 1. As shown in FIG. In this figure, disk 1 is a disk having the same recording format as the disk described in FIG. The spindle motor 12 is a motor that rotates the disk 1, and the head 13 reads information recorded on the disk 1. The traverse drive unit 14 is a drive circuit that moves the head 13 to a predetermined recording/reproducing surface of the disk 1 for tracking. The signal processing unit 15 reproduces the read signal from the head 13 and also temporarily holds the necessary information of each data area, and processes the information contained in the data areas 2 and 3 and the disk control area 4. The signals are separated according to their contents and output as signals 15a, 15b, 15c, and 15d. The disc control signal 15a is a signal recorded in the disc control area 4 of the disc 1, and is a signal recorded in the disc control area 4 of the disc 1.
, 3, and their starting address information are included. The reproduction signal 15b is a signal such as audio, video, or digital data signal. Rotation error signal 1
5c is a signal indicating the error between the current number of rotations of the disk and the specified number of rotations. The status signal 15d is a signal related to disk control, and is used to determine the attribute of the signal in each data area (referring to the type of signal such as audio signal, video signal, various digital data, etc.).

The motor drive unit 16 is a spindle motor 12
A drive circuit that rotates the spindle motor 12 controls the rotation of the spindle motor 12 based on the specified specified rotation speed and the signal 15c. The switches 17a, 17b, and 17c receive the reproduced signal 15b, and each outputs the reproduced signal 15 according to the attribute of the information group.
This is a circuit that separates the destination of b, and constitutes the information separation section 17. The audio processing section 18a, the video processing section 18b, and the data processing section 18c are each given a group of information in each data area by the reproduction signal 15b from the signal processing section 15, and demodulated into the original audio signal, video signal, and data signal. This is a circuit that does this. The memory unit 20 is a memory that receives the disc control signal 15a from the signal processing unit 15 and stores the disc rotation speed and start address information necessary for reproducing each data area 2, 3. A rotation speed signal 20c indicating the rotation speed of the motor 12 read out by the memory section 20 is given to the motor drive section 16. The address signal 20d is a signal for moving the head 13 to a predetermined recording position on the disk 1, and is input to the traverse control section 21.

The system control section 22 is constituted by a microcomputer and memory (not shown), and is supplied with an external command signal X for instructing playback data from the outside. The system control unit 22 supplies the motor drive unit 16 with a motor drive command signal 22a that instructs the spindle motor 12 to start or stop rotation, and a traverse drive command signal 22b that instructs the head 13 to start or end movement to a predetermined recording position. is given to the traverse control section 21. The system control unit 22 also generates a control command signal 22 for controlling the memory unit 20 according to a prescribed procedure.
c to the memory section 20, and the switches 17a, 17b, 1
An information control command signal 22d for controlling opening/closing of the opening/closing section 7b is given to the information separating section 17.

The operation of reproducing information on the disc 1 shown in FIG. 1 using the disc reproducing apparatus of this embodiment configured as described above will be explained. Here, for data area 2, for example, the start address 2A is 2400, the information transfer rate is 1.5 Mbps, and the disk rotation speed is 500 r.
pm, it is assumed that the information group stored in this data area is an audio signal. Also, the start address 3A of data area 3 is 6
Address 00, the information transfer speed is 7.5 Mbps, the disk rotation speed is 2500 rpm, and the information group in this data area is a video signal. When starting up the disc playback device, the system control section 22 supplies a motor drive command signal 22a to the motor drive section 16 to control the spindle motor 12.
Rotate. At this time, the head 13 is positioned at the innermost circumference of the disk 1 by the traverse command signal 22b,
The disk 1 rotates at a specified number of rotations. Next head 13
reads the data in the disk control area 4. The signal processing unit 15 detects transfer speed data and recording position data of each data area, and temporarily holds these data. Next, this transfer speed data, that is, the number of revolutions of the disk, and the start address, which is recording position data, are outputted to the memory unit 20 as a disk control signal 15a, and a memory control command signal 22
c is stored in the memory unit 20. Therefore, the memory unit 20 contains data such as address 2400, which is the start address of data area 2, and the corresponding data such as the rotation speed of the disk, 500 rpm, and 600, which is the start address of data area 3.
Address and corresponding disk rotation speed 2500r
pm, as well as the start addresses of all other data areas (not shown) and transfer speed data of the data areas, respectively.

Next, data area 2 is
We will explain what happens when you issue an instruction to play . At this time, when the command is issued, the system control unit 22 outputs a memory control command signal 22c to the memory unit 20,
The disk rotation speed (500 rpm) and start address information (address 2400) corresponding to data area 2 already stored in the memory unit 20 are found. Next, the rotational speed signal 20c of the spindle motor 12 is supplied to the motor drive section 16 to control the rotational speed of the disk 1 to a rotational speed corresponding to the data area 2, that is, 500 rpm. At this time, the motor drive section 16 refers to the rotation error signal 15c, and
The rotation speed of the motor 12 is maintained at 500 rpm. On the other hand, the start address information outputted by the memory section 20, that is, the address signal 20d, is sent to the traverse control section 21, which drives the traverse drive section 14 to move the head 13 to the target address.
That is, it moves to address 2400. By the time head 13 reaches address 2400, disk 1
reaches a specified rotational speed of 500 rpm, and while reading this data area 2, the rotational speed of the disk 1 is kept constant. At this time, the signal processing unit 15 sends a status signal 15d that determines the attributes of the information group to the system control unit 22.
sent to. If the signal currently being read is an audio signal, the system control unit 22 outputs an information control command signal 22d, closes the switch 17a, and simultaneously closes the switch 17b.
, 17c are opened. As a result, the reproduced signal 15b of the data area 2 is input to the audio processing section 18a via the information separation section 17, and is converted into an audio signal and output.

Next, data area 2 is
The operation when an instruction is issued to reproduce the video signal of the data area 3 from the state where the audio signal of the data area 3 is being reproduced will be explained. At this time as well, the system control section 22 outputs the memory control command signal 22c to the memory section 20. The memory unit 20 stores the number of rotations of the disk corresponding to the data area 3 (25
00 rpm) and start address information (600 address)
Read out. Next, the rotation speed signal 2 of the spindle motor 12
0c to the motor drive unit 16, and set the rotation speed of the disk 1 to the rotation speed corresponding to the data area 3 (2500 rpm).
to control. Then, the address signal 20d is sent to the memory section 20.
At the same time, the traverse drive command signal 22b output by the system control unit 22 is also received from the traverse control unit 2.
1 accepts. As a result, the head 13 is moved to the target address, ie, address 600, via the traverse drive section 14. By the time the head 13 reaches the predetermined address 600, the disk 1 has reached a predetermined rotational speed of 2500 rpm, and the data in the data area 3 is stably read out immediately after the head 13 detects the target address. Then, the signal processing unit 15 sends the status signal 15d to the system control unit 22. In this case, the system control unit 22 determines that it is a video signal and sends the information control command signal 22 to the system control unit 22.
Output d. As a result, switch 17b is closed, and at the same time switches 17a and 17c are opened. Therefore, the reproduction signal 15b of the data area 3 is sent to the video processing section 18b via the switch 17b, converted into a video signal, and output. As described above, according to this embodiment, when reading the information in each data area 2 and 3 of the disk 1, by first reading the information in the disk control area 4, the required information group is transferred at an appropriate transfer rate. It can be taken out automatically.

A second embodiment embodying the invention of claim 3 of the present application will be described below with reference to the drawings. FIG. 3 is a plan view showing the configuration of a disk in the second embodiment. Components having the same functions as those in FIG. 1 are designated by the same reference numerals and detailed explanations will be omitted. Also in this figure, the disk 1a is provided with data areas 2 and 3 which are recorded at different transfer speeds, and other data areas not shown in this figure are also provided. Each data area 2 and 3 has a first data area 2B and 3 located at the beginning thereof.
B, and following that area there is a second data area 2D.
and 3D. In data areas 2B and 3B,
The number of rotations of the disk corresponding to the transfer speed of the information groups in the second data areas 2D and 3D and data indicating the attributes of the information groups are recorded. Unlike the first embodiment, the disk 1a does not have a disk control area on the inner circumference.

FIG. 4 is a block diagram of a disc reproducing apparatus for reading the disc 1a shown in FIG. Each block in FIG. 4 and its basic configuration are the same as those in the first embodiment described above, and the same blocks are denoted by the same reference numerals and detailed description thereof will be omitted. The difference between the configuration of FIG. 4 and the configuration of the first embodiment is that the address signal 20d output from the memory section 20 is not supplied to the traverse control section 21 as shown in FIG. The memory section 20 stores only the number of rotations of the disk 1a necessary for reproducing each data area 2, 3. Furthermore, the audio processing section 31a, the video processing section 31b, and the data processing section 31c each have an internal memory that holds the reproduced signal 15b, and together constitute the information storage section 31. A clock signal 30 is supplied from the system control unit 22 in order to read information from the internal memory.

The operation of the disc reproducing apparatus configured as described above will be explained with reference to FIGS. 3 and 4. The disc 1a shown in FIG. 4 is a disc having the same recording format as the disc described in FIG. For example, data area 2 has a transfer rate of 1.5 Mbps and a disk rotation speed of 500.
RPM audio signal, data area 3 is transfer rate 7.
The video signal is 5 Mbps and the disk rotation speed is 2500 rpm. When starting up the disc playback device, the system control section 22 supplies a motor drive command signal 22a to the motor drive section 16 to rotate the spindle motor 12. At this time, the head 13 is positioned at the innermost circumference of the disk 1a by the traverse command signal 22b, and the disk 1a rotates at a specified rotational speed. Now, when the external command signal X is input to the system control section 22 from the outside, the disk 1a
Reading starts sequentially from the innermost circumference to the outer circumference. If the first external command signal A signal including the number of rotations of the disk and the attributes of the information group is read from area 3B. Then, the number of rotations of the disk is sent to the memory section 20 as a disk control signal 15a. At the same time, a signal indicating the attribute of the information group held in the signal processing unit 15 is a status signal 15.
d is sent to the system control unit 22. If the information matches the information to be reproduced, the system control unit 22 sends the signal 15.
d, it is determined that it is a video signal, and an information control command signal 22d is output to the information separation section 17. Therefore, switch 17b is closed and at the same time switches 17a and 17c are opened. Further, in parallel with this, the system control section 22 outputs a memory control command signal 22c to the memory section 20. The rotational speed of the disk corresponding to the data area 3 already stored in the memory section 20, that is, the information of the first data area 3B, is outputted from the memory section 20 to the motor drive section 16 as the rotational speed signal 20c of the spindle motor 12. Then, the rotation speed of the disk 1a is set as the rotation speed corresponding to the data area 3,
That is, it is controlled to be 2500 rpm. During this time, the reproduced signal 15b read in the second data area 3D is sent to the video processing section 31b via the switch 17b. However, the reproduction signal 15 sent to the video processing section 31b
In the first period of time b, the disk 1a has not reached the specified number of revolutions, so the read speed is not stable. As a countermeasure against this, the video signal of the reproduced signal 15b is first stored in the internal memory of the information storage section 31. Thereafter, the video signal stored in the memory is read out at a specified transfer speed using a clock signal 30 corresponding to a specified rotation speed. As a result, the video signal in the second data area 3D is output in a state as if it were being reproduced at a constant rotation speed from the beginning.

Next, the head 13 continues to reproduce the disk 1a, and if the next external command signal X instructs reproduction of the audio signal in the data area 2. When the playback position of the disc 1a reaches the position of the audio signal in the data area 2, the signal processing unit 15 stores the disc control signal 15a including the disc rotational speed and the attributes of the information group from the first data area 2B into the memory. Send to Department 20. At the same time, a signal indicating the attribute of the information group held in the signal processing section 15 is sent to the system control section 22 as a status signal 15d. System control unit 2
2 determines that the signal 15d is an audio signal and outputs an information control command signal 22d to the information separation section 17. Switch 31a is then closed, and at the same time switches 31b and 31c are opened. In parallel with this operation, a rotational speed signal 20c is supplied to the motor drive section 16 as the rotational speed of the disk corresponding to the data area 2 already stored in the memory section 20, as in the case of the video signal described above. As a result, the rotation speed of the disk 1a is controlled to 500 rpm. Next, the reproduced signal 1 of this second data area 2D
5b is sent to the audio processing section 31a via the switch 17a. In this case as well, the playback signal 1 sent to the audio processing section 31a
5b is temporarily stored in the internal memory of the audio processing section 31a because the disk 1a does not reach the new specified rotation speed. After a while, the audio signal is read out using the clock signal 30 corresponding to the specified rotational speed. As described above, according to this embodiment, there is no need to provide the disk control area 4 when reading information in each data area 2, 3 of the disk 1a. As a result, the entire surface of the disk can be used as a data area, and more information can be stored on one disk. In addition, the required information group can be automatically retrieved in sequence at an appropriate transfer speed.

Next, a third embodiment embodying the invention of claim 4 of the present application will be described with reference to the drawings. FIG. 5 is a plan view showing the configuration of a disk in the third embodiment. Components having the same functions as those in FIG. 3 are designated by the same reference numerals, and detailed description thereof will be omitted. Also in this figure, the disk 1b is provided with data areas 2 and 3 that are recorded at different transfer speeds, and other data areas not shown in this figure are also provided. Each data area 2 and 3 has a first data area 2B and 3 located at the beginning thereof.
B, and following that area are empty areas 2C and 3C. These areas 2C and 3C are physical gaps in which no information is recorded. Furthermore, the second data areas 2D and 3D following this are areas where information groups of the same attribute are collectively recorded. First data area 2B and 3
Similarly to the second embodiment, in B, the number of revolutions of the disk corresponding to the transfer speed of the information groups in areas 2D and 3D and data indicating the attributes of the information groups are recorded.

The reproduction operation of this disc 1 is also performed in the disc reproduction apparatus shown in FIG. 4 in the same manner as in the second embodiment, so a detailed explanation will be omitted. This embodiment differs from the second embodiment in that the number of revolutions of the disk corresponding to each data area 2 and 3 is set to the first data area 2B and 3B.
The rotational speed of the disk 1 can be changed to a specified value in the empty areas 2C and 3C until the start of the second data areas 2D and 3D is detected. That is, the configuration differs from that of the second embodiment in that the internal memory provided in the information recording section 31 of FIG. 4 is not required. The disks 1, 1a, and 1b used in the above embodiments may be optical disks such as compact disks or video disks, or magnetic disks such as hard disks. Furthermore, the format of information recorded on the disc and the attributes of the information are not limited by the type of recording medium. And Figure 1, Figure 3,
As shown in FIG. 5, the plurality of data areas in which information is recorded and reproduced are arranged concentrically with respect to the recording surface of the disk, but they may also be arranged in a spiral shape.

[0024]

As explained in detail above, according to the invention of claim 1 or 2 of the present application, a disk control area is provided in a location different from a data area where information groups are collectively recorded on the recording/reproducing surface of the disk. has been established. The recording position data and transfer speed data for each data area are recorded in this area, so when reading disc information, you can access the information in the required data area by first reading the disc control area. can. Furthermore, each data area has information groups recorded at different transfer speeds, so information groups with different properties such as audio, video, and other digital data can be selected on a single disc. This makes it possible to realize an excellent disc that can be read.

According to the invention of claim 3 of the present application, the second data area is located at the beginning of the data area.
The transfer speed of the information group included in the data area is recorded. Since a disk control area for recording transfer speed data and recording position data for each data area on the innermost circumference of the disk is not required, a large number of data areas can be provided for collectively recording information groups. When reading information from a disk, by scanning the head from the inner circumference of the disk to the outer circumference, the required information group is selected, creating an excellent disk that can extract information at a specified transfer speed. It is something to do.

Furthermore, according to the invention of claim 4 of the present application, the first
Since there is an empty area in which no information is recorded between the data area and the second data area, the transfer speed data of the data group recorded in the first data area is read out, and the information group is recorded all at once. The number of revolutions of the disk can be increased to a specified value by the time the signal of the second data area is reproduced. Therefore, the memory capacity required for the information recording section of the disc playback device is small, and an excellent disc that does not require a disc control area can be realized.

[0027]The disc playback device according to the invention of claim 6 or 7 can play back the discs of the invention according to claims 1 to 5, and is suitable for compact disc players that mainly record audio information, video information, etc. The advantage is that a single type of playback device can play back many types of information groups with different attributes without the need for separate devices such as a video disk player for recording or a disk drive used in a data processing device. can get.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the configuration of a disk according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a first embodiment of a disc playback device that plays back the disc shown in FIG. 1;

FIG. 3 is a plan view showing the configuration of a disk according to a second embodiment.

FIG. 4 is a block diagram showing a second embodiment of a disc playback device that plays back the disc shown in FIG. 3;

FIG. 5 is a plan view showing the configuration of a disk according to a third embodiment.

[Explanation of symbols]

1, 1a, 1b disk 2, 3 Data area 2A, 3A address 2B, 3B First data area 2C, 3C empty area 2D, 3D second data area 4 Disk control area 12 Spindle motor 13 Head 14 Traverse drive section 15 Signal processing section 16 Motor drive section 17 Information separation department 17a, 17b, 17c switch 18a, 31a Audio processing section 18b, 31b Video processing section 18c, 31c Data processing section 20 Memory section 22 System control section 31 Information storage section

Claims (7)

[Claims] 1. In a disc for recording and reproducing information, a plurality of data areas and at least one disc control area are formed on the recording and reproducing surface of the disc, and each data area stores a group of information having the same attribute. recorded,
The disc control area is an area that is reproduced at a specified transfer rate, and the disc control area is an area that holds transfer rate data for reproducing the information group of each data area and recording position data of each information group on the disc. A disc featuring. 2. The disk according to claim 1, wherein the transfer speed data in the disk control area is the number of revolutions of the disk for reproducing the data area. 3. In a disc for recording and reproducing information, a plurality of data areas for recording information groups of the same attribute are formed on the recording and reproducing surface of the disc, and each of the data areas is positioned at the beginning of the data area. It has a first data area and a second data area positioned following the first data area, and the second data area is an area in which a group of information to be reproduced at a specified transfer speed is recorded. A disc characterized in that the first data area is an area in which transfer rate data of the information group of the second data area is recorded. 4. The disk according to claim 3, wherein an empty area in which no information is recorded is provided between the first data area and the second data area. 5. The disk according to claim 3, wherein the transfer speed data of the first data area is the number of revolutions of the disk for reproducing the second data area. 6. A disc playback device for reading information recorded on a disc according to claim 1 or 2, comprising: a motor drive unit that rotates a spindle motor of the disc at a number of rotations corresponding to a prescribed transfer speed; , a head that reads information in a disc control area and a data area recorded on the disc, a traverse drive unit that traverses the head to a prescribed recording position, and the disc control area and data read from the head. a signal processing unit that separates and holds information in the area; a memory unit that holds the transfer rate and recording position values of each information group read from the disk control area of the disk; The system control unit includes an information separation unit that separates information in the data area to be output according to an attribute of an information group, and a system control unit that operates based on an external command signal, and the system control unit operates in accordance with the signal processing unit. outputs the recording position data from the traverse driver and causes the head to traverse to the reading position via the traverse driver, and also sends data area information from the signal processor to the information separator to determine the attributes of the information group. A disc playback device characterized in that the number of rotations of the spindle motor is maintained at a specified value via the motor drive unit in accordance with the transfer speed data from the signal processing unit. 7. A disc playback device for reading information recorded on a disc according to claim 3 or 4, comprising: a motor drive unit that rotates a spindle motor of the disc at a number of rotations corresponding to a prescribed transfer speed; , a head that reads information in a data area recorded on the disk, a traverse drive unit that traverses the head to a prescribed recording position, and a signal that separates and holds information in the data area read from the head. a processing unit, a memory unit that holds the transfer rate of each information group read from the first data area of the disk, and a memory unit that maintains the transfer rate of each information group read from the first data area of the disk; The system control unit includes an information separation unit that separates information according to attributes, an information storage unit that holds each information group from the information separation unit, and a system control unit that operates based on an external command signal. , outputting recording position data from the signal processing section;
The head is traversed to the reading position via the traverse drive section, and the information of the data area from the signal processing section is sent to the information separation section, and the information is distributed according to the attributes of the information group, and the information from the signal processing section is sent to the information separation section. The rotational speed of the spindle motor is maintained at a specified value via the motor drive section, a clock signal is sent to the information storage section, and the information is transferred from the information storage section at the specified transfer speed. A disc playback device characterized by outputting.