JPH04274030A - Recording method for optical disk - Google Patents

Abstract

PURPOSE:To enable the reproduction of CD-WO in a driving device having other form by recording the structure information in a prescribed position when data is written in an optical disk (CD-WO) incapable of rewriting and capable of recording. CONSTITUTION:When data is written in CD-WO1, the innermost peripheral track 11 is left empty. After data is written for plural track 12, the structure information on the data is written in the innermost peripheral track 11. By recording the same one as specified structure information regulated in the optical disk (CD-ROM) incapable of recording in the position regulated by a standard, CD-WO1 can be reproduced in the driving device for CD-ROM. Therefore, the interchange-ability of CD-WO1 can be improved.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording method for a non-rewritable, recordable optical disc.

0002

[Background Art] Conventional optical discs include non-recordable optical discs (referred to as CD-ROMs), non-rewritable optical discs (referred to as CD-WOs), and rewritable optical discs such as MOs. Optical discs are known. Corresponding to the characteristics of these optical discs, dedicated recording/reproducing drive devices have generally been used. Regarding physical format, CD-RO
M and CD-WO are compatible.

0003

[Problems to be Solved by the Invention] Regarding the data format, the logical format of CD-ROM, that is, the file structure is based on ISO9660.
standards, which are standardized almost worldwide. On the other hand, CD-
This standard is not adopted as the data format for WO discs. Therefore, even if the physical format is the same, the CD-ROM drive device
It was impossible to play CD-WO.

[0004] Accordingly, an object of the present invention is to provide an optical disc recording method that enables playback of a CD-WO by a drive device for other types of optical discs, such as CD-ROMs, which have the same physical format as the CD-WO. It is about providing.

[0005]

[Means for Solving the Problems] The present invention is a recording method for a non-rewritable, recordable optical disc, which includes the steps of: recording data by leaving a predetermined position on the optical disc; This optical disc recording method includes the step of returning to the predetermined position and recording structure information upon completion of recording.

[0006]

[Operation] By matching the structure information with that of the optical disc of another format, the information written on the optical disc can be reproduced by a drive device for the optical disc of the other format, and the compatibility of the optical disc can be improved.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows a drive device for an optical disc, for example, a CD-WO, for implementing the present invention. However, in FIG. 1, only the configuration of the recording system is shown for the sake of simplicity. In FIG. 1, 1 indicates CD-WO. This CD-WO 1 is rotated by a spindle motor 2 at CLV (constant linear velocity) similarly to a CD-ROM. CD-WO1 is CD-ROM and physical format, i.e. size, track format,
The optical characteristics etc. are compatible. In order to have the characteristics of a WO, it is sufficient to use a conventionally known recording medium, such as a perforated type or a phase change type, in which the geometrical shape changes with a recording laser beam.

Reference numeral 3 denotes an optical pickup that is moved by a feed motor 4 in the radial direction of the CD-WO 1. The optical pickup 3 has a semiconductor laser and an optical system.
A recording laser beam is incident on the recording surface of the CD-WO 1. The spindle motor 2 and the feed motor 4 are controlled by a servo circuit 5. A control signal from a system controller 6 is supplied to the servo circuit 5 . Under the control of the system controller 6, the optical pickup 3 is positioned on a predetermined track via the servo circuit 5 and the feed motor 4.

[0009] 7 indicates a host computer. This host computer 7 outputs digital data to be written to the CD-WO 1 and control commands to the system controller 6. Digital data is stored in buffer memory 8, and data read from buffer memory 8 is supplied to formatter 9. The formatter 9 converts the data into write data for the CD-WO1. Write data from the formatter 9 is supplied to a laser drive circuit 10. Laser drive circuit 10
generates a drive signal for modulating the laser beam according to the output data of the formatter 9. This drive signal is supplied to the semiconductor laser of the optical pickup 3,
A recording laser beam is generated from the optical pickup 3.

FIG. 2 conceptually shows an example of tracks formed on the CD-WO 1. When writing data to the CD-WO 1, the first track 11 indicated by the broken line in FIG. 2 is not written to but is left empty. In CD-WO1, for example, one track has 128 sectors, and one sector has 2325 bytes. FIG. 3 partially shows an example of the address of CD-WO1. The writable area starts from the absolute time code 0 minutes 0 seconds (0,0). As mentioned above, the addresses of the tracks to be left vacant start, for example, from 2 minutes and 0 seconds (2,0). Recording on the CD-WO 1 may be performed so that the first track is always left empty, or the first track may be selectively left empty by determining whether or not freezing, which will be described later, is possible and corresponding flag information. For example, when wobbling the track groove at a predetermined frequency for tracking control on the CD-WO 1, the above-mentioned address information can be recorded by FM modulating the wobbling frequency. Alternatively, address information can be recorded by embossing onto the track.

The recording operation for the CD-WO 1 according to this embodiment will be explained with reference to the flowchart of FIG. 3. When the recording operation is started, as mentioned above, the CD-WO
Data is written in the first track (the track indicated by the broken line in FIG. 2) containing a predetermined address of O1, for example, LSN16 (step 21). And in Figure 2, 1
After a series of data has been written to a plurality of tracks indicated by 2, it is checked in step 22 whether or not freezing occurs. Freeze means CD-R
This means that it is compatible with OM, and in the initial settings prior to the actual start of the write operation, whether freezing is possible is set, and the system controller 6 identifies whether freezing is possible from the corresponding flag information. can.

When freezing is not to be performed, the process returns to step 21, and when freezing is to be performed, structure information is written to the first track containing LSN 16 (step 23). This structure information is, for example, CD-
ISO96 is a logical format for ROM
It is based on the 60 standard and includes a basic volume descriptor, secondary volume descriptor, volume partition, volume descriptor set terminal, etc. for one disk (volume). The structure information is defined in correspondence with the set of data to be written, and can be generated by the formatter 9, for example. The reason why this structure information is written from LSN 16 at a predetermined address (2,0) of the first track is to match the recording position in this standard.

[0013] When writing of structure information to the first track is completed, it is checked in step 24 whether writing should be continued. When writing continues, digital data is written into the area indicated by 13 in FIG. 2 (step 25). If writing is not to be continued, recording ends (step 26). Additional writing can be performed once the recording operation is completed, and control may be adopted to ensure that writing continues until the last track of CD-WO1.

In FIG. 2, after writing data to a plurality of tracks, returning to the first track 11, writing structure information, and further writing other recorded data in area 13, the CD-WO 1 is played back. Explain the operation. First, according to the original drive device of CD-WO1, all of the information can be read out. In this case, the structure information of the first track is CD-
Since it is for ROM, it is unnecessary for the CD-WO1 drive device and is not used as a reference for processing read data.

When this CD-WO 1 is read by a CD-ROM drive device, structure information from the first track 11 and read data from a plurality of tracks 12 can be used. That is, since the CD-ROM drive device can obtain structure information that conforms to the standard from the track 11,
You can understand the structure of data written in , and use this data appropriately. However, since the structure of the data written in the tracks added to the area 13 is unknown, even if it can be reproduced by the optical pickup 3, it cannot be used as valid data.

[0016] Note that the above embodiment is applicable to CD-WO and CD-WO.
- Although the relationship with ROM has been described, the present invention is not limited to both. What is important is that one is a non-rewritable, recordable optical disc and the other is another type of disc, such as a read-only optical disc. Therefore, the format of the structure information is not limited to the above-mentioned example, and may be any format set for other types of optical discs. Further, the recording position of the structure information is not limited to the innermost track of the disc, but may be the outermost track depending on the data writing order.

[0017]

Effects of the Invention When data is written to a non-rewritable, recordable optical disc, the recorded data can be saved by recording structure information regarding a read-only optical disc in a predetermined track. It becomes possible to read the data with a drive device for optical discs for other formats. Therefore, even systems that only have drives for other types of optical discs are not rewritable.
Data written on a recordable optical disc can be effectively used.

[Brief explanation of the drawing]

FIG. 1 is a general block diagram of a drive device that can be used to implement the present invention.

FIG. 2 is a schematic diagram for explaining the outline of a track pattern on a disk.

FIG. 3 is a schematic diagram partially showing an example of a track address.

FIG. 4 is a flowchart for explaining one embodiment of the present invention.

[Explanation of symbols]

1 CD-WO 3. Optical pickup 11 First track

Claims (1)

[Claims] Claim 1. A recording method for a non-rewritable, recordable optical disc, comprising: recording data by leaving a predetermined position on the optical disc; and upon completion of recording the data, the predetermined An optical disc recording method comprising the steps of returning to the position and recording structure information.