KR20030020602A - High Density/Normal Density Recording Method Of Optical Recording Media - Google Patents

Abstract

PURPOSE: A method for judging the kind of an optical recording medium is provided to easily judge the density of the optical recording medium in case that data is written or reproduced in normal density or high density. CONSTITUTION: A high-density display area is inserted into a reserved area of the utmost inner periphery of a disk. The maximum mark length is repeatedly written on high-density display area during 30ATIP(Absolute Time In Pre-groove) frames from Ts1-00:35:65 ATIP(Min:Sec:Frame) based on a lead-in start time(Ts1) displayed at the disk. When the corresponding recording medium is being reproduced, a short wavelength signal is detected. If the short wavelength signal is detected, the disk is recognized as a high-density recording disk.

Description

High Density / Normal Density Recording Method Of Optical Recording Media

The present invention relates to a disc discrimination method for discriminating whether a high density recording disc or a low density recording disc is used when low density recording or high density recording is performed using the same type of disc.

A CD-R / RW drive is a device that connects to a PC and reads or stores data for the CD-R / RW. The CD drive can generally read data recorded on CD-type discs (CD-ROM, CD-AUDIO) and record data on a disc (CD-R) (CD-RW). In particular, CD-R can only be written once, but CD-RW can be rewritten many times. Each disc complies with the standard format of the CD family (as defined in redbooks, yellowbooks, etc.), making it compatible to read from CD-ROM drives, CD-R drives, and CD-RW drives.

Standards for CD-R and CD-RW are specified in the Orange Book. Due to the compatibility and high recording capacity of CD-ROM drives, CD-R / RWs are in the spotlight as the main data storage devices of PCs. Especially, CD-RWs are getting more and more attention due to their rewrite characteristics.

In the case of CD-R and CD-RW discs, grooves in the form of land grooves are formed along the surface of the recording track, and data is recorded along the surface during data recording. Unlike CDs that can write, read-only discs cannot use pit trains already recorded during initial recording or overwrite as information for tracking servos, focus servos, and linear velocity control (CLV) servos. Land grooves store absolute position information and some disk information, called ATIP (Absoulte Time In Pre-groove), using a physical encoding method called wobble, which realizes servo control using ATIP. It is used as an absolute position to synchronize with the address of the sector actually recorded. That is, since the absolute position is determined, recording / reproducing at any position is possible by using the ATIP address.

Data storage space on a disk can be thought of as a contiguous set of structures called contiguous sectors (= Frames). One sector can store approximately 2048 bytes of information. Each sector is addressed (addressed) so that it can be located directly. CD systems use an addressing method called MSF (Min, Sec, Frame). One second is 75 sectors (Frame), and one minute is 60 seconds. That is, one frame means one sector. There is an area in the sector that retains its own address information, which is called a sub-queue (SUB-Q). In the CD-R, CD-RW system, the address of the MSF recorded in the SUB-Q is recorded so as to match the ATIP address of the position. The data storage space consisting of several sectors is divided into lead-in, program and lead-out areas. In the CD-R and CD-RW systems, the PMA area and the PC (in front of the first lead-in) are divided. PCA) region and the like.

The lead-in area is an area in front of the program area, and is provided with a data structure called TOC (TOC). In this TOC, information on tracks recorded in the program area is recorded. Recognize the existence of these people and find their location.

The program area is an area capable of storing actual meaningful data and is composed of one or more track areas. That is, there may be several tracks in the program area. In the case of an audio-CD, typically one song is stored in one track.

The lead-out area is a spare area outside the program.

The lead-in area, program area, and lead-out area are collectively called a session. Multiple sessions can be established on one disk, which is called multisession.

The starting position of the program area of the first session is physically defined. The data space after 0: 0: 0 is addressed incrementally by 1 in the MSF address, and the front area is decreased by 1 in the direction of the first lead-in. It is addressed in the form. The last address of the first lead-in is typically 99:59:74.

The PMA area exists only in the recording CD system, and is used to store the recorded track information because one session can be recorded in track units. For example, if you record a track and then eject the disc without creating a session, there is no way to verify the existence of the track on the disc. For this reason, PMA is necessary. Information is added to the PMA area each time a track is recorded, and the start and end position information of the track is stored in this PMA entry.

A typical recording method for a disc is as follows.

If only an additional recording method is allowed from the beginning of the disc, the track cannot be recorded at an arbitrary position. In the case of a reserved track, even if the information is not recorded in its entirety, it can be recorded in the next track, and the session can be recorded later. However, in order for the session to be closed, all tracks in the session must be recorded and incomplete tracks must be closed. When the session is closed, the location information of the program area of the next session is recorded in the lead-in so that the next session can be found quickly. If you do not create a pointer to the next session, the disk becomes a disk that can no longer be written to. In the case of a CD-RW, since rewriting is possible, the entire recorded track can be overwritten, but it is impossible to change the track length arbitrarily. Therefore, in the case of rewriting, the entire disc must be rewritten.

As mentioned above, CDs, CD-ROMs, CD-Vs and the like have become very successful media for storing audio, MPEG video and many other digital information. However, 680 Mbytes of storage capacity is insufficient for storing graphics-centric computer applications and high-definition digital video programs. DVD, which is considered to be an extension of the CD series, is a new optical recording medium with a storage capacity of seven times more than a normal CD. Usually, the increase in storage capacity has been improved by the quality improvement of the light source and the objective lens. In addition, the increase in the storage capacity of DVDs is due to the complete redesign of the disc's logical format using the more powerful recording codes RS-PC and EFMPlus.

This RS-PC ECC and 8/16 modulation code allows for the recording of more capacity than conventional CD encoding when recording the same sized user data onto a CD-R / RW recording medium. By applying this, it is possible to use a conventional optical recording medium (similar disk) to increase the recording density and to perform twice the high density recording using the EFM + code having good code efficiency. That is, a drive that supports both CD-R / RW systems and high-density CD-R / RW systems. Therefore, a means for discriminating whether a normal density disk or a high density recording disk is used when recording at the same density or when high density recording is performed on the same type of disc is required.

In the past, a method of determining a heterogeneous disk has been proposed. Heterogeneous discs can be distinguished using high frequency signals (Wobble Signal) or other reflectances that are set differently depending on the disc.

However, when the normal density recording is performed using the same type of disc as described above or when the high density recording is performed, the recording density cannot be distinguished during reproduction by using the high frequency signal or the reflectance of the disc. This is because the same type of disk has the same high frequency signal or reflectance.

The present invention is a high density recording method for an optical recording medium, characterized by inserting a high density display area for recording data at high density into an existing CD-R / RW disc.

The present invention is characterized in that a method for recording data at high density and low density on a single disk, and for this purpose, a high density display area is inserted into the disk during high density recording on the disk.

The present invention inserts a high-density display area on the inner circumference of a disc when the user data is recorded at high density on a CD-R / RW disc using RS-PC ECC and an 8/16 modulation code or a modulation code having a similar code rate. Characterized in that.

The present invention is a high density recording method for an optical recording medium, wherein the low density data recording method is in accordance with the conventional CD recording method, and a high density display area is inserted into the disc during high density data recording.

The present invention is characterized in that an area not used in the CD-R / RW disc specification is secured as a high density display area during high density recording, and a specific mark is recorded in the corresponding area.

The present invention is characterized in that it is discriminated whether it is a normal density recording disk or a high density recording disk by detecting the high density display area during reproduction of the optical recording medium.

The present invention is characterized by detecting whether or not a normal density recording disk or a high density recording disk is detected by detecting the high density display area during reproduction of an optical recording medium, and performing disc reproduction control according to the determination result.

1 shows an example of a signal of a high density recording display area in the present invention;

2 shows the structure of a CD-R / RW.

Fig. 3 shows an example of a recording disc structure corresponding to a case of normal density recording and a case of high density recording in a CD-R / RW.

4 is a view showing a type discrimination process of the optical recording medium according to the present invention.

5 is a diagram showing the configuration of an optical recording and reproducing apparatus according to the present invention.

Fig. 1 shows an example of a signal in a high density recording display area for explaining the present invention. As described above, a high-density recording is performed using an EFM plus code or the like as described above, and a Ts1-00: 35: 65 ATIP [is used as a high-density display area based on the lead-in start time Ts1 displayed on the disc. The maximum mark length (11T or 14T) is repeatedly recorded from Min: Sec: Frame to 30ATIP frames to indicate that the medium has been recorded at a high density. For example, if the high-density display area is inserted in the innermost circumference of the disc, the short-wavelength signal will be detected for a certain period as shown in Fig. 1 in the high-density recording display area on the inner circumference of the disc during playback. In such a case, the medium is identified as a high density recording disk.

This high-density display area is an area not used by the CD-R / RW disc specification and is a position where no RF waveform is detected during normal density recording.

2 shows the structure of a CD-R / RW disc. It shows the structure of PCA TEST, PCA COUNT, PMA, LEAD-IN, and PROGRAM AREA from the innermost circumference of the disk. In the present invention, a high-density display area is inserted into an unused area and the innermost circumference of the disc. Fig. 3A shows the recording information structure of the disc shown in Fig. 2, wherein inserting a high density display area by using an unused area on the innermost side of the disc is shown in Fig. 3B. ). Fig. 3A shows the structure of the normal density recording disk, and shows the unused areas (Reserved), PCA TEST, PCA COUNT, PCA, LEAD-IN, and PROGRAM areas, respectively. Fig. 3 (b) shows the structure of the high density recording disk, shows the high density recording in the unused area of the innermost side of the disk, and shows PCA TEST, PCA COUNT, RMA (Recording Management Area), LEAD-IN, PROGRAM AREA is shown. The recording of the high-density display area on the innermost circumference of the disc is to ensure the stability of the servo.

As shown in Fig. 3B, the high-density display area according to the present invention starts from Ts1-00: 35: 65 ATIP [Min: Sec: Frame] based on the lead-in start time Ts1 displayed on the disc. A maximum mark length (for example, 11T or 14T) is repeatedly recorded for 30 ATIP frames to indicate that the medium has been recorded in a high density recording method. Here, the method proposed for the high-density display area, that is, repeatedly recording the maximum mark length (11T or 14T) from Ts1-00: 35: 65 ATIP [Min: Sec: Frame] to 30ATIP frames is one way. It is an example only and not limited to this method.

In this way, when a high density display area is inserted during high density recording, when a medium is reproduced, a short wavelength signal is detected as shown in FIG. 1, and when a short wavelength signal 11T or 14T is detected, it may be recognized as a high density recording disk.

Figure 4 shows the control procedure of the optical disk drive including the disc determination process according to the present invention, disc insertion, disc presence determination, disc rotation drive, CD-R / RW disc reading, drive of the servo device, disc density discrimination Proceed with high density servo drive and RMA lead.

When the disc is inserted into the optical disc drive, the presence or absence of the disc is determined from the magnitude of the RF signal output generated by the focusing search operation. When it is determined that the disc is inserted, the drive is started to rotate the disc, and the recordable disc CD-R and the rewritable disc CD-RW are discriminated from the high and low disc reflectance. An appropriate CD-based servo device is driven for the disc, and a signal reproduced from the innermost circumference of the disc is used to determine whether it is a high density recording disc or a low density recording disc (normal density recording disc). This determination reads the high-density recording display area as described above and checks whether short-wavelength 11T or 14T signals are detected, and if short-wavelength signals are detected, discriminates them as high-density recording disks, and if not, normal-density recording disks.

In the case of a normal-density recording disc, the CD-based reproduction method is used. That is, the process proceeds to the PCA read step to reproduce the data recorded on the normal density disk, and in the case of the high density disk, the high density servo is driven and the process moves to the RMA read step to reproduce the data recorded on the high density disk.

FIG. 5 is a block diagram showing an embodiment of an optical disk drive supporting both a CD-R / RW system and a high-density CD-R / RW system according to the method of determining a recording medium type of the present invention described above.

The optical recording medium is a disc 1 and includes a spindle motor 2, a spindle motor driver 3, and a pickup section 4 for recording or reproducing data on the optical disc 1 for driving a disk rotation. The pickup section 4 includes an optical pickup 4a, an LD driver 4b, and an I / V amplifier 4c. It also includes a sled motor 5 for pick-up driving, and a driver 6 for focusing / tracking / sled driving during reproduction or recording of the disc data by optical pickup. And a recording LD controller 7 for controlling the recording LD power by the LD driver 4, an RF amplifier 8 for processing RF signals during data reproduction or recording of the optical disc, encoding of recording or reproduction data or A codec 9 for decoding, a host computer 10 for controlling the entire optical disk drive, an OPC / ROPC circuit 11 for optical power control processing, a type of recording medium and a servo according to the determined medium type It includes a micro-controller 12 for performing the control, a digital servo processor 13 to perform the servo control according to the type of the recording medium under the control of the microcontroller 12.

When recording or reproducing data, the data is encoded or decoded by the codec 9 under the control of the host computer 10, and a signal necessary for recording the data through the recording LD controller 7 and the RF amplifier 8 is performed. Processing and processing are performed, and the reproduction signal is processed by the RF amplifier 8 and decoded via the codec 9. The recording data or the reproduction data will be recorded or reproduced on the disc 1 by the pickup section 4 in an appropriate format, and the digital servo processor 13 will focus on the focusing / tracking / sled driver by the microcontroller 12. 6) to control the pickup (4). In addition, the spindle disk 2 is driven through the spindle driver 3 to drive the optical disk 1 at a constant speed.

As described above, the microcontroller 12 is responsible for discriminating whether or not the recording medium is a high density recording disk or a low density recording disk. That is, when the microcontroller 12 receives the playback signal of the innermost circumference of the disk from the RF amplifier 8 and detects the short wavelength signal 11T or 14T for a predetermined period, the microcontroller 12 determines that it is a high density recording disk. Determine by disk. The determination result is transmitted to the digital servo processor 13 by the microcontroller 12, and the PCA lead (CD-R / RW playback) servo is performed in the case of a normal density disk, and the RMA lead (high density CD) in the case of a high density disk. -R / RW regeneration) Servo is performed.

The present invention has proposed a method of determining the type of optical recording medium when recording data at a high density (double capacity) using the existing CD-R / RW optical recording medium as it is. In particular, by inserting a high density recording display area at the innermost circumference of the optical disc during high density recording, it is easy to discriminate whether the medium is a high density recording disc or a normal density recording disc when recording / reproducing data at normal density or high density on the same type of disc. I suggested a way to do this.

In addition, the present invention performs a servo control corresponding to a high-density display area when a high-density display area is detected during disc reproduction in one optical disk drive system, and performs a servo control corresponding to a normal-density recording disc, thereby providing high density or It is possible to play back a disc recorded at a normal density.

Claims (8)

Inserting a high density recording display area at a specific position of the optical recording medium to enable normal density recording and reproduction and high density recording and reproduction with respect to the same type of optical recording medium; And determining whether the area is a high density recording medium or a normal density recording medium depending on whether or not an area is detected. 2. The high density recording display area according to claim 1, wherein the high density recording display area is recorded in a form of a corresponding signal so that a short wavelength signal can be detected during a predetermined period during reproduction, and the detected high wavelength recording disc is determined as a high density recording disk. A method for determining the type of optical recording medium. The method of claim 1, wherein the high density recording display area is inserted in the innermost circumference of the optical disc. The method of claim 1, wherein the high-density recording display area repeatedly records the maximum mark length for a predetermined ATIP frame on the basis of the lead-in start time so that a short wavelength signal can be detected during a certain period during reproduction. A method of determining the type of optical recording medium to be used. 5. The method of claim 4, wherein the signal of the high density recording display area is repeatedly recorded in a length of 11T or 14T. Means for allocating a high density display area to a specific area of the optical recording medium and recording a high density display signal in the area so as to enable normal density recording and reproduction and high density recording and reproduction for the same type of optical recording medium; Means for detecting a signal of a high-density display area, and data reproducing / control means for recognizing the detection of the high-density display signal as a high-density recording medium and reproducing the medium. And playback apparatus. 7. The recording and reproducing apparatus of an optical recording medium according to claim 6, wherein the high-density display signal is inserted at the innermost circumference of the optical disk at a position where no RF waveform is detected during normal density recording. 7. The recording of the optical recording medium according to claim 6, wherein the high density display signal repeatedly records the maximum mark length for a predetermined ATIP frame on the basis of the lead-in start time of the innermost circumference of the optical disc. Playback device.