JPH09134527A - Optical disk and optical disk-recording/reproducing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To introduce a double-side simultaneous recording/reproducing method without any trouble. SOLUTION: An identifier indicating a double-side simultaneous recording/ reproducing method or a double-side non-simultaneous recording/reproducing method is written in an optical disk 1. When the identifier written in the optical disk 1 is '11', a controller 6 recognizes it as the double-side simultaneous recording/reproducing method. If the identifier indicates '10', the controller 6 recognizes it as the double-side non-simultaneous recording/reproducing method. The optical disk 1 is recorded/reproduced in a method conforming to the recognized result.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an external storage medium such as a computer and an image processing device, an optical disk used as an external storage device, and an optical disk recording / reproducing device.

[0002]

2. Description of the Related Art Conventionally, in this type of optical disc recording / reproducing apparatus, an optical head is arranged only on one side of the optical disc and data is recorded / reproduced only on one side of the optical disc. That is, when only one side of the optical disc is used as the access side and the other side is used as the access side, the optical disc is inverted by an autochanger or the like.

In recent years, there has been an increasing demand to increase the recording / reproducing speed of information, and an optical disk and an optical disk recording / reproducing apparatus having a high recording / reproducing speed are desired. For example,
It is considered that the optical heads are arranged on both sides of the optical disc and data is recorded / reproduced simultaneously on both sides of the optical disc. That is, both sides of the optical disk are used as access surfaces, the data is divided into two systems for recording, the data from the two systems are integrated and combined for reproduction, and data is recorded / reproduced simultaneously on both access surfaces. Is being considered.

[0004]

However, when such a double-sided simultaneous recording / reproducing system is introduced, an optical disc of the double-sided simultaneous recording / reproducing system and an optical disc of the double-sided non-simultaneous recording / reproducing system coexist, and an optical disc recording / reproducing apparatus is provided. There is a problem that the data cannot be discriminated and the data cannot be correctly recorded and reproduced.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an optical disk and an optical disk recording / reproducing apparatus capable of introducing the double-sided simultaneous recording / reproducing system without any trouble. It is in.

[0006]

[Means for Solving the Problems]

[Optical disc] In order to achieve such an object, the first
The invention (the invention according to claim 1) is such that an identification area for writing an identifier indicating a double-sided simultaneous recording / reproducing system or a double-sided non-simultaneous recording / reproducing system is provided at a predetermined position of the optical disc. . According to the present invention, if an identifier indicating the double-sided simultaneous recording / reproducing system or the double-sided non-simultaneous recording / reproducing system is written in the identification area, whether or not recording / reproducing can be performed by the double-sided simultaneous recording / reproducing system can be performed by discriminating this identifier. It becomes possible to judge.

[0007] The second invention (the invention according to claim 2) is the first invention.
In the invention, the identification area is provided in the ID portion of the predetermined sector. Third invention (claim 3
The invention according to claim 1) is the same as the first invention, in which an identification area is provided in the data portion of a predetermined sector. According to the second invention and the third invention, it is possible to determine whether or not recording / reproducing can be performed by the double-sided simultaneous recording / reproducing system by discriminating the identifier as in the first invention.

The fourth invention (the invention according to claim 4) is the first
In the invention, at the time of factory shipment, an identifier indicating whether the double-sided simultaneous recording / reproducing method or the double-sided non-simultaneous recording / reproducing method is undecided is written in the identification knowledge. According to the present invention, at the time of factory shipment, an identifier indicating that the recording / reproducing method is undecided is written in the identification knowledge.

The fifth invention (the invention according to claim 5) is the first invention.
In the present invention, when data is first written by the optical disc recording / reproducing apparatus, the identifier corresponding to the optical disc recording / reproducing apparatus is automatically written in the identification area. According to the present invention, when data is first written (immediately before or immediately after), the identifier corresponding to the optical disk recording / reproducing apparatus is automatically written in the identification area.

The sixth invention (the invention according to claim 6) is the first invention.
In the present invention, the characteristic peculiar to the disc is an identifier indicating the double-sided simultaneous recording / reproducing system or the double-sided non-simultaneous recording / reproducing system. According to the present invention, a characteristic peculiar to the disc, for example, a difference in reflectance at a predetermined position on the disc, a disc shape, a material and the like are used as the identifier.

[Optical Disk Recording / Reproducing Apparatus] A seventh invention (an invention according to claim 7) reads an identifier of an optical disk indicating a double-sided simultaneous recording / reproducing system or a double-sided non-simultaneous recording / reproducing system, and the read identifier is its own. If it does not match the recording / reproducing system, the request for recording / reproducing on the optical disc is rejected. According to the present invention, for example, when the read identifier does not match the recording / reproducing system of its own, the optical disc is ejected.

According to an eighth aspect of the invention (the invention according to claim 8), when a disc initialization command is received, it is uncertain whether the double-sided simultaneous recording / reproducing system or the double-sided non-simultaneous recording / reproducing system is in the identification area of the optical disc. The identifier is written. According to the present invention, when the disc initialization command is received, an identifier indicating that the recording / reproducing method is undetermined is written in the identification area of the optical disc.

The ninth invention (the invention according to claim 9) is such that, when an initialization command for the disc is received, an identifier according to the recording / reproducing system of the disc itself is written in the identification area of the optical disc. According to the present invention, when the initialization command for the disc is received, the identifier according to the recording / reproducing system of the disc itself is written in the identification area of the optical disc.

The tenth invention (the invention according to claim 10) is
When the identifier of the optical disc indicating the double-sided simultaneous recording / reproducing system or the double-sided non-simultaneous recording / reproducing system is read, and when the read identifier is the double-sided simultaneous recording / reproducing system, the data is divided into two systems for recording and the surface of the optical disc is recorded. The data is simultaneously recorded on the back side, and at the time of reproduction, the data is simultaneously reproduced from the front side and the back side of the optical disk and integrated and combined. The data is recorded on one surface of the optical disk without dividing the system, and the data is reproduced from the one surface of the optical disk at the time of reproduction.

According to the present invention, if the optical disk identifier is the double-sided simultaneous recording / reproducing system, recording and reproducing are performed as follows. [Recording]: Data is divided into two systems and simultaneously recorded on the front surface and the back surface of the optical disc. [Playback]: Data is simultaneously played back from the front surface and the back surface of the optical disk and integrated and combined. If the optical disc identifier is the double-sided non-simultaneous recording / reproducing system, recording and reproducing are performed as follows. [Recording]: Data is recorded on one surface of the optical disc without being divided into two systems. [Playback]: Data is played back from one side of the optical disc.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail based on embodiments. FIG. 1 is a diagram showing a main part of an optical disk recording / reproducing apparatus showing an embodiment of the present invention. In the figure, 1 is an optical disk, 2 is a front head provided on the front side of the optical disk 1, 3 is a front surface recording / reproducing circuit, 4 is a back head provided on the back surface side of the optical disk 1, 5 is a back surface recording / reproducing circuit, Reference numeral 6 is a controller, and 7 is a spindle motor.

The optical disc 1 is rotated by a spindle motor 7 under the control of the controller 6. While rotating at a constant speed, the front head 2 and the back head 4 cause the spots of the light beam to follow the tracks on the front surface and the back surface of the optical disc 1. The optical disc 1 has spiral or circular tracks on its front and back surfaces.

Further, on the optical disk 1, an identifier indicating the double-sided simultaneous recording / reproducing method or the double-sided non-simultaneous recording / reproducing method is written in a predetermined sector of the innermost track on the disk surface (for example, the surface). There is. FIG. 2 is a schematic view of the innermost track. In this embodiment, an identification area S1DS is secured in the data portion S1D of the sector S1 and an identifier (“11”, “10”, "0
"1", "00") is written.

Here, the identifier "11" is a double-sided simultaneous recording / reproducing system, "10" is a double-sided non-simultaneous recording / reproducing system, and "0".
"1" and "00" indicate that the double-sided simultaneous recording / reproducing method or the double-sided non-simultaneous recording / reproducing method is undecided. In this embodiment, it is assumed that the identifier "11" has already been written in the identification area S1DS.

Next, the operation of this optical disk recording / reproducing apparatus will be described with the function of the controller 6 included. The controller 6 reads the identifier written in the identification area S1DS in a state where the optical disk 1 enters the apparatus, rotates in preparation for recording and reproduction, and the light beam rises following the track. In this case, since the identifier is "11", the controller 6 recognizes that the optical disc 1 is a double-sided simultaneous recording / reproducing system.

[Recording (simultaneous double-sided recording / reproducing system)] When the controller 6 receives a recording request from a host device (not shown) such as a host computer, the controller 6 sends the data from the host device to the front and back sides. It is divided into two systems, and the divided data is sent to the front surface recording / reproducing circuit 3 and the back surface recording / reproducing circuit 5. The data sent to the front surface recording / reproducing circuit 3 and the back surface recording / reproducing circuit 5 is converted into an electric signal, and the head 2
And 4 and are recorded on the front surface and the back surface of the optical disk 1 at the same time.

[Reproduction (simultaneous double-sided recording / reproducing system)] When the controller 6 receives a reproducing request from the host device, the controller 6 simultaneously reproduces the data from the front surface recording / reproducing circuit 3 and the back surface recording / reproducing circuit 5. The data from the front surface and the back surface of the optical disk 1 are integrated, combined, and sent to the host device.

In the above description, the identifier "11" is written in the identification area S1DS, but when the identifier "10" is written in the identification area S1DS, the controller 6 operates as follows. Operate. In this case, the controller 6 recognizes from the identifier “10” that the optical disc 1 is a double-sided non-simultaneous recording / reproducing system.

[Recording (double-sided non-simultaneous recording / reproducing system)] When the controller 6 receives a recording request from a higher-level device, the front-side recording / reproducing circuit 3 or the back-side recording is performed without dividing the data from the higher-level device into two systems. Send to the reproduction circuit 5. The data sent to the front surface recording / reproducing circuit 3 or the back surface recording / reproducing circuit 5 is converted into an electric signal, sent to the head 2 or 4, and recorded on the front surface or the back surface of the optical disc 1.

[Reproduction (double-sided non-simultaneous recording / reproducing system)] When the controller 6 receives a reproduction request from the host device, the controller 6 reproduces the data from the front surface recording / reproducing circuit 3 or the back surface recording / reproducing circuit 5, that is, the head 2 or 4. The data from the front surface or the back surface of the optical disk 1 is sent to the host device.

In the above embodiment, the sector S
Although the identification area S1DS is secured in the first data portion S1D, it may be secured in the ID portion S1I.

Further, in the above-described embodiments, the description has been made assuming that "11" is already written as the identifier in the identification area S1DS, but the identifier is first written in the identification area S1DS by the optical disk recording / reproducing apparatus. At this time, the data may be automatically written according to the optical disk recording / reproducing device.

For example, at the time of factory shipment, the identification area S1DS
"01" or "00" is written as an identifier in advance. Immediately before or after the data is first written by the optical disc recording / reproducing apparatus, the identifier corresponding to the optical disc recording / reproducing apparatus is automatically written in the identification area S1DS. That is, if the optical disk recording / reproducing apparatus is the double-sided simultaneous recording / reproducing system, “11” is displayed.
Automatically write to.

Further, in the above-described embodiment, when the identifier "10" is written in the identification area S1DS, the data recording / reproducing is performed by the double-sided non-simultaneous recording / reproducing method. It may be possible to reject the recording / reproducing request to the optical disc 1 (for example, to eject the optical disc 1) because it does not match the (double-sided simultaneous recording / reproducing system).

When a disc initialization command is received from the host device, "01" or "" indicating that the double-sided simultaneous recording / reproducing system or the double-sided non-simultaneous recording / reproducing system is undecided in the identification area S1DS of the optical disc 1. The identifier "00" may be written, or the identifier according to the recording / reproducing system of the user may be written.

Further, in the above-described embodiment, the identifier is written in the identification area S1DS, but the characteristics peculiar to the optical disc, such as the difference in reflectance at a predetermined position of the disc, the shape and material of the disc, etc. The identifier may be recognized by the optical disk recording / reproducing apparatus.
In this case, if it is considered as an optical disk including a disk and a disk cartridge that protects this disk, the difference in reflectance at a predetermined position of the disk cartridge, the shape (notch or hole) of the disk cartridge, the material, etc. are used as identifiers. You can also

[0032]

As is apparent from the above description,
According to the optical disc of the present invention, it is possible to determine whether or not recording / reproduction can be performed by the double-sided simultaneous recording / reproducing system by discriminating the identifier. Even if the double-sided simultaneous recording / reproducing system is introduced, the recording / reproducing can be performed without any trouble. It becomes possible to perform an operation. Further, according to the optical disk recording / reproducing apparatus of the present invention, even if the double-sided simultaneous recording / reproducing system is introduced by writing the identifier in the identification area of the optical disk or reading the identifier of the optical disk, the recording / reproducing operation is performed without any trouble. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main part of an optical disc recording / reproducing apparatus showing an embodiment of the present invention.

FIG. 2 is a schematic diagram of tracks on the innermost circumference of the optical disc in FIG.

[Explanation of Codes] 1 ... Optical disc, 2 ... Front head, 3 ... Front recording / reproducing circuit, 4 ... Back head, 5 ... Back recording / reproducing circuit, 6 ... Controller, 7 ... Spindle motor.

Claims (10)

[Claims] 1. An optical disc having an identification area for writing an identifier indicating a double-sided simultaneous recording / reproducing system or a double-sided non-simultaneous recording / reproducing system at a predetermined position. 2. The optical disc according to claim 1, wherein the ID portion of a predetermined sector has an identification area. 3. The optical disc according to claim 1, wherein the data area of a predetermined sector has an identification area. 4. The optical disc according to claim 1, wherein an identifier indicating whether the double-sided simultaneous recording / reproducing method or the double-sided non-simultaneous recording / reproducing method is undetermined is written in the identification information at the time of factory shipment. 5. The optical disc according to claim 1, wherein an identifier corresponding to the optical disc recording / reproducing device is automatically written in an identification area when data is first written by the optical disc recording / reproducing device. 6. An optical disc, wherein a characteristic peculiar to the disc is an identifier indicating a double-sided simultaneous recording / reproducing system or a double-sided non-simultaneous recording / reproducing system. 7. An identifier reading unit for reading an identifier of an optical disc showing a double-sided simultaneous recording / reproducing system or a double-sided non-simultaneous recording / reproducing system, and when the identifier read by the identifier reading unit does not match its own recording / reproducing system, An optical disk recording / reproducing apparatus comprising: a refusal unit for rejecting a recording / reproducing request for the optical disk. 8. When a disk initialization command is received,
An optical disk recording / reproducing apparatus comprising: means for writing an identifier indicating that it is undecided whether a double-sided simultaneous recording / reproducing method or a double-sided non-simultaneous recording / reproducing method is set in an identification area of the optical disk. 9. When a disk initialization command is received,
An optical disk recording / reproducing apparatus comprising means for writing an identifier according to a recording / reproducing system of the optical disk in an identification area of the optical disk. 10. An identifier reading unit for reading an identifier of an optical disc showing a double-sided simultaneous recording / reproducing system or a double-sided non-simultaneous recording / reproducing system, and when the identifier read by the identifier reading unit is the double-sided simultaneous recording / reproducing system, At the time of recording, the data is divided into two systems to be simultaneously recorded on the front surface and the back surface of the optical disc, and at the time of reproduction, the data is simultaneously reproduced from the front surface and the back surface of the optical disc, integrated and combined, and the identifier reading means. If the identifier read by is a double-sided non-simultaneous recording / reproducing system, the data is recorded on one side of the optical disc without dividing into two systems at the time of recording, and the data is recorded from one side of the optical disc at the time of reproducing. An optical disk recording / reproducing apparatus comprising: a reproducing unit.