KR100317371B1 - Pvd reproducing method for disk - Google Patents

Abstract

The present invention relates to a technique for more quickly and stably detecting the start position information of a multi-session disc in a CD / DVD-ROM drive. Proceeding to the in-region and reading sub-queue code data and determining whether the current disk is a multi-session disk based on the data; When the current disc turns out to be a multi-session disc, when the tracking servo is turned off and only the focus servo is turned on, on the basis of the track cross signal, when the data non-recording area following the last session is reached from the lead-in area of the first session. A second step of continuously driving without reading information of the lead-in or lead-out area of each session until; This is accomplished by a third process of moving from the data non-recorded area to the lead-out area of the last session to read sub-queue data.

Description

How to play disc management information {PVD REPRODUCING METHOD FOR DISK}

The present invention relates to a method for reproducing a multi-session disc, and more particularly, to a method for reproducing management information of a disc, which is suitable for quickly reading session management information.

Nowadays, on discs such as CD-R (also called CD-R: CD-Recordable or CD-WO (Write-once)) and CD-RW (CD-Rewritable), data is classified and recorded in multiple sessions. -The session method is being adopted. In order to properly play such a multi-session disc, it is necessary to find out the session information recorded in the CD / DVD-ROM drive.

FIG. 1 exemplarily shows a structure of a four-session multi-session disc. As shown in FIG. 1, one session includes a lead-in area, a program area, and a lead-in. It consists of a lead-out area. A disk in which two or more such sessions exist in the same disk is called a multi-session disk. For reference, the standard regarding this multi-session disc is defined in Orange Book Part2.

At the start of the program area of each session (S1-S4), information of data recorded below the session is located, which is called PVD (PVD: Primary Volume Descriptor). Since the PVD is composed of logical data such as file and directory information, it is essential information for knowing the data information recorded on the disk. These PVDs are updated every time a session is added.

Information about the start position of the program area of the session is contained in the sub-Q code data in the lead-in area and the lead-out area. That is, as shown in FIG. 2, the program area start position information of the next (or next) session is recorded in the sub-queue code (Mode5 and POINT = B0) in the lead-in area, and the sub-queue in the lead-out area. In the code (Mode5 and INDEX = D1), program area start position information of the current session is recorded. The information in the lead-in and lead-out can be used to determine the PVD location of the session.

Meanwhile, referring to FIG. 3, a reproduction data processing process on a multi-session disc according to the prior art will be described.

First, the driving of the pick-up apparatus is controlled to read the start position PVD2 of the next session S2 in the first lead-in area LI1 of the first session S1 and read-out area of the current session S1. After moving to (LO1), the track jump to the lead-in area (LI2) of the next session (S2) and repeats the process of reading the start position (PVD3) of the next session (S3) repeatedly to the last session Proceed to

If the disk consists of four sessions as shown in Fig. 3, the lead-out area of the next session is found in the lead-out (LO4) of the last session (S4). Will be placed. Then, it is assumed that the session no longer exists, and the PVD4 read in the third lead-in area LI3 among the PVD1 to PVD4 location information read so far is finally stored.

However, in such a prior art, since the lead-in area and lead-out area of each session are sequentially searched, it takes a lot of time, especially as the number of sessions is large (up to 45 sessions in the case of a 12cm disc in size). There is a problem that it takes a lot of time (tens of seconds to minutes) to read the PVD location information.

In addition, frequent failures due to frequent investigations and repeating track jumps occur frequently, and especially when there is a bad condition such as a defect on a disk, slippage or sub-cue code read-fail occurs, thereby providing information on all sessions. There is a fault that ends in an unread state, because there is no way to set the appropriate time-out, and there is no way to know the total number of sessions. In addition, the firmware to be controlled is complicated and has a large size defect.

Accordingly, an aspect of the present invention is to provide a method for reproducing management information of a disc, which accesses the management information of a corresponding session for reproducing a multisession disc at a higher speed.

1 is a data format diagram of a multi-session disc.

2A is a format diagram of sub-queue data.

Fig. 2B is a format diagram of sub-queue data in the lead-in area.

Fig. 2C is a format diagram of sub-queue data in the lead-out area.

3 is an explanatory diagram for detecting management information of a multi-session disc according to the prior art;

4 is an explanatory diagram for detecting management information of a multi-session disc according to the present invention;

5 is a waveform diagram of a track cross signal;

6 is a block cross signal processing block diagram according to the present invention;

7 is a signal flowchart of a method for detecting management information of a multi-session disc according to the present invention;

*** Description of the symbols for the main parts of the drawings ***

1: envelope signal generator

2: A / D converter

3: microcomputer

The method for reproducing management information of a disc according to the present invention comprises the steps of: proceeding to the lead-in area of the first session on the disc, reading sub-queue data and determining whether the current disc is a multi-session disc based on the data; When the current disc turns out to be a multi-session disc, when the tracking servo is turned off and only the focus servo is turned on, on the basis of the track cross signal, when the data non-recorded area after the last session is reached from the lead-in area of the first session. A second step of continuously driving without reading information of the lead-in or lead-out area of each session until; The third step is to move from the data non-recording area to the lead-out area of the last session to read sub-queue data, and to obtain the total number of sessions and the final PD start address information based on this. When described in detail with reference to Figure 4 to Figure 7 attached to the operation of the present invention.

4 illustrates a process of accessing management information of a multi-session disc according to the present invention. As can be seen here, in the present invention, the start-in information (= position of the last PVD) of the program area PA4 of the last session is transferred to the lead-in area LI3 of the immediately preceding session S3 of the last session S4. It is not taken in, but in the lead-out area 4 of the last session S4.

That is, the present invention does not go from the lead-in area of the in-disc session, but directly proceeds to the lead-out area LO4 of the last session S4 to read necessary information. As follows.

The driving of the pickup apparatus is controlled to move to the lead-in area LI1 of the first session S1, where the sub-Q code data is read to determine whether the current disk is a multi-session disk. . If the result of the check indicates that the disk is not a multi-session disc, no further seek operation is necessary, and thus the investigation operation is terminated.

As a result of the above confirmation, if the current disk is found to be a multi-session disk, it immediately goes to the lead-out area LO4 of the last session S4. However, at this time, since there is no address information necessary to go directly to the lead-out area LO4 of the last session S4, as shown in FIG. Move to the desired lead-out area LO4.

However, there may be various methods of going directly from the lead-in area LI1 of the first session S1 to the lead-out area LO4 of the final session S4. For example, the track cross signal shown in FIG. 5 may be used.

The track cross signal TCS as shown in FIG. 5 is outputted when the pickup device is driven in the disc circumferential direction while the sled is moved out of the disc while the tracking servo is turned off and only the focus servo is turned on. The signal TCS is converted into the envelope signal ENV by the top holder circuit of the envelope signal generator 1, and then digitally converted by the A / D converter 2 and transmitted to the microcomputer 3. .

Accordingly, the microcomputer 3 determines the current travel position based on the amplitude change of the track cross signal TCS input through the above path, thereby controlling the travel of the pickup apparatus. That is, when the amplitude of the track cross signal TCS is at a relatively high level A1, it is determined that the area where data is recorded is being driven and continues to run. It is determined that the vehicle has traveled to an area where no data is recorded, and the vehicle is driven to the lead-out area LO4.

Subsequently, it enters the lead-out area LO4 of the last session S4 and reads the sub-queue code {Mode (ADR) = 5, INDEX = 1} of the last session S4, which is the sub-queue code. Contains the start address of the program area PA4 of the last session. Therefore, the program area PA4 of the last session is read on the basis of the start address, and the PVD information of the entire session is read. Based on this, the data of the track selected by the user can be read.

Based on the PVD start address information obtained through the above process, the information of the data recorded in each session can be read, and the data of the track selected by the user can be read based on the information.

As described in detail above, the present invention travels from the lead-in area of the first session to the data non-recorded area located after the lead-out area of the last session, and then moves to the lead-out area of the last session. By reading the cue data, the positional information retrieval time can be significantly shortened.

In addition, since the track is crossed using the track cross signal, a seek error may be prevented from occurring due to a defect of the disc (Finger Print, foreign matter).

Claims (3)

A first step of proceeding to the lead-in area of the first session on the disc, reading the disc type determination data, and determining whether the current disc is a multi-session disc based on the data; If the current disc turns out to be a multi-session disc, with the tracking servo off and only the focus servo on, no information on the disc is read from the lead-in area of the first session until the data non-recording area following the last session. A second step of continuously running without; And moving to the lead-out area of the last session in the data non-recording area to read sub-queue data. The method of claim 1, wherein the disc type determination data of the first step is sub-queue data. 2. The disc management according to claim 1, wherein the second step comprises a step of distinguishing a data recording area from a non-recording area using a track cross signal in a state in which the tracking servo is turned off and only the focus servo is turned on. How to play information.