KR100592499B1 - The Method of Recording and Searching Last Data Address at Recording Area Indicator in DVD+R - Google Patents

Abstract

In the DVD + R of the present invention, the address recording method includes: a) virtually dividing a plurality of fragments into a plurality of sections when data recorded in one of the plurality of fragments exceeds 640ECC. Assigning a serial number; b) extracting the serial number assigned to the last address of data recorded in each of the plurality of fragments; c) arranging the extracted serial numbers in a fragment order and manufacturing them in a high frequency (RF) pattern; And d) recording the high frequency pattern in a corresponding portion of a recording area indicator (RAI).

DVD + R, Fragment, and Record Area Indicators

Description

The method of recording and searching last data address at recording area indicator in DVD + R in DVD + R             

1 is a flowchart illustrating a method of recording a last data address in a recording area indicator in a DVD + R according to an embodiment of the present invention.

2 illustrates a method of extracting a T value from each fragment according to an embodiment of the present invention.

3 is a diagram specifically showing a method of recording a last data address in a recording area indicator in a DVD + R according to another embodiment of the present invention.

4 is a flowchart illustrating a method of searching for a last data address in a recording area indicator in a DVD + R according to an embodiment of the present invention.

5 is a view showing a shortening of a recording section according to the present invention.

The present invention relates to a method of recording and retrieving the last data address in a recording area indicator in a DVD + R. In particular, the present invention relates to a recorded area indicator (RAI) area of a DVD + R disc effectively. It is about how to find the last record address used for searching and recording efficiently and quickly.

0x30000 of the disk-The area up to the outer periphery of the disk is divided into 640ECC (640 * 16 * 2k = 20480k = 20MB), and if the RF is recorded at least one ECC within the 640ECC, 4 sectors are recorded in the recorded area. When this disc is recognized again, the recording area indicator finds the place where the RF is located, calculates the length of the RF from the beginning of the recording area indicator, finds which part of the data area is actually pointing, and then goes to that part to determine the 640ECC. Scan to find the last record address. The final record address found is used as the starting position for the next recording.

The conventional method only needs to scan all 640ECCs because the recording area indicator can only tell which 640ECCs RF is present in. The 640ECC usually scans in multiple sections, since searching in one scan is very large.

In this case, it takes a lot of time to find the final record address. Moreover, if there are several fragments (2-16) and each fragment is not closed, it takes a very long time to recognize all the fragments and report them to the host. In addition, a large number of servo operations occur for a large section of 640ECC.

The present invention has been made to solve the above problem, and instead of recording a meaningless RF in the recording area indicator, it records a specific pattern of RF reflecting the state of the data area so that the disc searches the final recording area. It is to provide a recording method and a retrieval method that enables a quick retrieval by reducing the search interval.

In the address recording method of DVD + R of the present invention, if the data recorded in one fragment of a plurality of fragments exceeds 640ECC, each fragment is divided into a plurality of sections. Giving; Extracting the serial number assigned to the last address of data recorded in each of the plurality of fragments; Listing the extracted serial numbers in a fragment order and manufacturing the extracted serial numbers in a high frequency (RF) pattern; And recording the high frequency pattern in a corresponding portion of a recording area indicator (RAI).

In the present invention, each fragment is preferably divided into nine sections.

In the present invention, the nine sections are preferably assigned a serial number up to 3T ~ 11T.

In the present invention, it is preferable that the extracted serial numbers are repeatedly listed as many as the number of fragments.

The address search method of the DVD + R of the present invention comprises the steps of: scanning a recording area indicator to extract a 640ECC area to which the area where data was last recorded belongs; Simultaneously extracting a high frequency pattern when scanning the recording area indicator to search for a pattern repeated as many as the number of fragments; Finding a pattern having the largest value by summing one period T of the repeated patterns among the extracted patterns; Analyzing the pattern to determine which of the plurality of division sections of each fragment belongs to the last recording area of each fragment; And extracting the last recorded area by scanning only one of the searched sections.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In adding reference numerals to components of the following drawings, it is determined that the same components have the same reference numerals as much as possible even if displayed on different drawings, and it is determined that they may unnecessarily obscure the subject matter of the present invention. Detailed descriptions of well-known functions and configurations will be omitted.

1 is a flowchart illustrating a method of recording a last data address in a recording area indicator in a DVD + R according to an embodiment of the present invention.

Step 101 is a process of determining whether more than 640 ECC has been recorded in the current fragment. When data is recorded in the fragment in the session in the DVD + R, if data is recorded in units of 640 ECC, if a session exists, The contents are recorded in the recording area indicator existing on the inner periphery of DVD + R. Therefore, it is determined whether or not there is new data to be written.

Step 102 is a process of dividing each of the plurality of fragments into nine sections. When the user data area existing in the session is divided into a plurality of fragments, each of the plurality of fragments is divided into nine pieces having the same size. do. This step is described in detail in FIG. There may be a plurality of sessions in the DVD + R depending on the size of the data, but in FIG. 2, only one session is taken as an example. It will be apparent to those skilled in the art that the present invention is equally applicable to other multiple sessions.

Referring to this step with reference to Figure 2, there are currently a total of M fragments from 1 to M in one session. The second fragment of the M fragments is divided into nine sections so as to have the same size. Each section is numbered from 1 to 9, and each section is assigned a serial number from 3T to 11T. The division of the section may be divided into nine sections smaller or more than nine sections, but in the present invention, the section is divided into nine sections. In addition, each of the interval size may be changed in various ways, but in the present invention, it will be divided evenly.

Step 103 is a process of extracting T of the section in which the last recording area is located. Referring to FIG. 2, the last address of the data recorded in the current fragment is located in the fourth partition, that is, in the section having a serial number of 6T. Since it is included, the value of T extracted from the second fragment is set to 6T. This extraction of T is extracted equally for all fragments and is performed equally for all sessions. The length of T is a numerical value indicating how far each fragment is recorded.

Step 104 is a process of extracting T by the number of fragments and collecting the extracted T to form an RF pattern. After extracting the T value of the section to which the last recording area of each fragment belongs, the sequence is listed in order of fragments. do. If the values listed in the above order are defined as 'one period', one RF pattern has a value in which the 'one period' is repeated by the number of fragments. For example, there are four fragments in one session and the T value extracted from the first fragment is 3T, the T value extracted from the second fragment is 4T and the third fragment is extracted. Assuming that the value is 5T and the value extracted from the fourth fragment is 6T, if you list them in order of fragments, they have 'one cycle' of 3T, 4T, 5T, and 6T, and these periods are the number of fragments. As the total RF pattern is repeated, 3T, 4T, 5T, 6T (1 cycle), 3T, 4T, 5T, 6T (2 cycles), 3T, 4T, 5T, 6T (3 cycles), 3T, 4T, 5T, 6T (4 cycles), a total of 16 T is repeated.

Step 105 is a process of recording the generated RF pattern in the corresponding portion of the recording area indicator, the size of which is four sectors. That is, in the above step, when recording 640ECC in each fragment and recording in the recording area indicator, T of each fragment is arranged and RF is recorded in the pattern.

The method of recording the last data address in the recording area indicator in the DVD + R according to the present invention has been described so far, but the present invention will be described through another embodiment for a more detailed understanding.

3A to 3C are flowcharts illustrating a method of recording a last data address in a recording area indicator in a DVD + R according to another embodiment of the present invention.

FIG. 3A shows a fragment structure before new data is recorded. There are three pieces of the current fragment, and each fragment is divided into nine sections. Before the new data is recorded, the last recording area of the first fragment belongs to section 5T, the last recording area of the second fragment also belongs to section 5T, and the last recording area of the third fragment is also 5T. It belongs to a section. Accordingly, 35, 5T, and 5T constitute one cycle, and the cycle of 5T, 5T, 5T, 5T, 5T, 5T, 5T, 5T, and 5T is repeated because the total number of fragments, that is, three times, is repeated. A pattern is formed and recorded in the recording area indicator. The total number of fragments can be found in a single disk control block (SDCB).

Thereafter, when new data is recorded, the structure of the fragment as shown in FIG. 3B is obtained. Referring to FIG. 3B, data is recorded in the second fragment and the third fragment. Thus, a change of the last recording area of the fragment occurs. In the past, however, the recording area indicator was recorded only when the recording of the data exceeded 640ECC, so it was not easy to find the last recording position of the data when the recording failed to exceed 640ECC as recorded in the second fragment. . However, according to the present invention, since the T value of the last recording area of each fragment is extracted and recorded again, the position can be known relatively in detail even if a small portion of recording is performed.

That is, if the T value corresponding to the last recording area of the changed fragment is extracted, 5T, 6T, and 7T form one cycle, and the entire RF pattern is 5T, 6T, 7T, 5T, 6T, 7T, 5T, 6T, 7T. Is generated and recorded in the recording area indicator.

4 is a flowchart showing a method of searching for a last data address in a recording area indicator in a DVD + R according to an embodiment of the present invention.

In step 401, the recording area indicator scans the recorded area to extract the 640ECC area to which the final recording area belongs, and extracts the 640ECC area in which the last recording area of the data recorded in each fragment exists. When the host writes with a plurality of fragments, the start address and the end address of each fragment are recorded in the single disk control block (SDCB) of the inner circumference of the disk. When the host writes and the disk comes out of the drive and then reinserts, it will ask you where to write the next time. Since the single disk control block (SDCB) information of the disk is nothing other than the start and end information of each fragment, it is necessary to find the last recording area required by the host. Thus, the recording area indicator in which the above contents are recorded is scanned.

Step 402 is a process of retrieving the number of fragments extracted from the session disc control block by extracting the RF pattern together when scanning the recording area indicator. In the present invention, only the presence or absence of RF was determined. In the present invention, the RF pattern is extracted as well as the presence or absence of RF. The repeated T of the extracted pattern is found with the number of fragments read from the single disk control block (SDCB) among the extracted RF patterns.

Step 403 is a process of retrieving a repeating pattern having the largest value by summing the T values of the repeated RF patterns, and since the value of the RF pattern is updated and recorded each time data is recorded, the most recently recorded RF pattern The value indicates the current state. Therefore, it is important to extract the most recently recorded RF pattern value, but in the present invention, only one period of repeated RF patterns is extracted, and each T value belonging to the period is summed to extract the period having the largest value. Then, the period having the largest value becomes a pattern representing the current recording state.

Step 404 is a process of dividing each fragment into nine sections and analyzing a repeating pattern to determine which section of each fragment the final recording area of each fragment is. Each T length of the RF pattern having a value is matched with a fragment to search for where the final recording area exists in the unit of dividing the length of each fragment by nine.

Step 405 is a process of extracting the final recording area by scanning only the searched section. If a part of each fragment in which the final recording area exists is divided by nine is found, the final recording area is scanned by searching within the unit.

As described above, the present invention uses the information divided into nine parts of each fragment and, if necessary, uses the information obtained in 640ECC units according to the original specification, and scans in a very short period to find the final recording area. The time for finding the final recording area of each fragment can be significantly shortened.

FIG. 5 is a diagram comparing sections for searching the final recording area. According to the conventional method, the final recording area is found after searching for all the 640ECC areas by length 1, but in the case of the present invention, the length 2 is found. Alternatively, only three areas need to be scanned.

As described above, it has been described with reference to the preferred embodiment of the present invention, but those skilled in the art various modifications and changes of the present invention without departing from the spirit and scope of the present invention described in the claims below I can understand that you can.

As described above, according to the present invention, by inserting a predetermined pattern into the RF, and reflecting the state of the last recording area of each fragment of the disk to the pattern to the maximum, the time for finding the final recording area through the pattern is greatly reduced. This can significantly reduce disk recognition on the host and the time spent looking for the next address the host needs to write.

This can eventually affect the entire recording time and, moreover, scan only a short section, thereby reducing unnecessary servo operation, thereby reducing the anxiety caused by many servo operations.

Claims (6)

In the address recording method to DVD + R, If the data recorded in one fragment of the plurality of fragments exceeds 640ECC, virtually dividing each of the plurality of fragments into a plurality of sections and assigning serial numbers; Extracting the serial number assigned to the last address of data recorded in each of the plurality of fragments; Listing the extracted serial numbers in a fragment order and manufacturing the extracted serial numbers in a high frequency (RF) pattern; And recording the high frequency pattern in a corresponding portion of a recording area indicator (RAI). 2. The method of claim 1, wherein each fragment is divided into nine intervals. 3. The method of claim 2, wherein the nine sections are assigned serial numbers of 3T to 11T. 2. The method of claim 1, wherein the extracted serial number is repeated as many times as the number of fragments. In the address search method of the DVD + R, Scanning the recording area indicator to extract a 640ECC area to which the area where data was last recorded belongs; Simultaneously extracting a high frequency pattern when scanning the recording area indicator to search for a pattern repeated as many as the number of fragments; Finding a pattern having the largest value by summing one period T of the repeated patterns among the extracted patterns; Analyzing the pattern to determine which of the plurality of division sections of each fragment belongs to the last recording area of each fragment; And extracting the last recorded area by scanning only one of the searched sections. 6. The method of claim 5, wherein the fragment is divided into nine intervals.

Images