JPH0580072B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for managing various types of information recorded inside a non-erasable recording medium such as an optical disk, and more specifically, a method for managing various types of information recorded inside a non-erasable recording medium such as an optical disk. A replacement track management index information area is provided in the
It has been possible to shorten the time to read various information,
This invention relates to an information management method for non-erasable recording media.

BACKGROUND TECHNOLOGY As shown in FIG. 5, the conventional physical configuration for realizing a logical address of this type of non-erasable recording medium consists of boundaries (plurality) 1 provided in a logical address space, alternate track areas 2, and , and a replacement track management area 3.

By the way, in non-erasable recording media, the existence of unreadable sectors (a sector is the minimum unit for reading and writing) makes it essential to have replacement sectors.

In other words, it is necessary to prepare several replacement sectors for a plurality of logical sectors. The boundary 1 is a set of these replacement sectors.

The spare sector is a spare area prepared for when various management information cannot be accommodated.
This is the alternate track area 2. The area for managing this spare track area 2 is the spare track management area 3.

By the way, in order to manage the spare track area 2, one spare track management sector is required for one spare track occurrence. This is because, even if the management information is only a few bytes, the sector is the minimum unit of recording, so in a non-erasable recording medium, the sector in which this information is recorded can no longer be used.

In other words, one replacement track management sector records management information for one replacement track. Therefore, as the number of occurrences of spare tracks increases, the spare track management sector also increases.

FIG. 6 shows an example of the format of the alternate track management sector.

In FIG. 6, the identification name iD and number of the alternate track management sector are recorded in the sector header field. Further, in the spare track management field, a logical sector number is recorded every time a spare track occurs.

Problems to be Solved by the Invention In short, as a conventional example, an example of alternate track management necessary for realizing a logical address has been described.As is clear from this, in the conventional management method, As the number of occurrences of replacement tracks increases, the number of replacement track management sectors within the replacement track management area 3 also increases.

The replacement track management area 3 has expanded in this way, that is, it has a huge number of replacement track management sectors.
Conventionally, desired management information was searched for. Therefore, the reading time required a long time, which was not practical.

Therefore, in the present invention, in addition to the conventional spare track management area 3, a new spare track management index information area is provided, and by searching this index information area, the readout time is significantly shortened. The purpose of this invention is to provide an information management method for non-erasable recording media.

Means for Solving the Problems In order to achieve the above-mentioned object, the information management method for a non-erasable recording medium according to the present invention provides a spare track management index information area in addition to the spare track management area. Each time a replacement truck occurs, a replacement track management sector is added to the replacement track management area, and when a predetermined number is reached, a replacement track management index information sector is created.
It is characterized in that this information is written in the replacement track management index information area.

Operation With the above configuration, the spare track management index information sector is written in the spare track management index information area. This index information sector is a collection of a predetermined number of replacement track management sectors that are added to the replacement track management area each time a replacement track occurs.

Therefore, the amount of spare track management index information sectors written to the spare track management index information area is much smaller than the amount of sectors written to the conventional spare track management area.

Desired management information is searched from such a replacement track management index information area with an extremely small amount of replacement track management index information sectors.Therefore, when searching, only a small number of replacement track management index information sectors are searched. Thus, the desired management information can be obtained, and the time required to read it when searching for it is also significantly reduced compared to the conventional method.

Embodiment FIG. 1 shows the physical configuration for realizing a logical address of a non-erasable recording medium (for example, an optical disk) used directly in implementing the method of the present invention.
The difference from the conventional configuration shown in the figure is that a replacement track management index information area 4 is newly provided.

Therefore, hereinafter, the newly provided spare track management index information area 4 will be mainly explained.

First, in FIG. 1, the spare track management area 3 in which the spare track management sector is written includes:
Each time a replacement track occurs, a replacement track management sector is added.

An example of the format of this alternate track management sector is as shown in FIG.

In FIG. 2, the sector header field contains the identification name iD, number, and number of the alternate track management sector.
In addition to the first number and the last number, the number of replacement tracks managed is sequentially recorded. Further, logical sector numbers are sequentially added to the spare track management field each time a spare track occurs.

In other words, the replacement track management field is
It is a write-once type, and the amount of management information increases for each sector.

When a predetermined number of alternate track management sectors additionally written in the alternate track management area 3 have been collected, index information (replacement track management index information sector) is created. This significantly reduces the amount of sectors read.

An example of the format of this alternate track management index information sector is shown in FIG.

In Figure 3, the sector head field contains the identification name of the replacement track management index information sector.
The iD and number, and the start number and end number of the alternate track management sector are recorded. Further, in the spare track management field, the predetermined number of spare track management sectors to which a logical sector number is assigned each time a spare track occurs is recorded as index information (spare track management index information sector).

That is, in this spare track management field, the contents of the management field of the spare track management sectors that have reached a certain predetermined number are recorded as index information.

In this way, the spare track management index information sectors created in the spare track management area 3 are sequentially written into the spare track management index information area 4.

When searching, this replacement track management index information area 4 is searched.

Finally, the operation of the system for carrying out the method of the present invention will be explained with reference to the flowchart shown in FIG. Note that ST ₁ to _{ST 7} in the figure indicate significant steps.

First, in ST ₁ , the central processing unit (not shown) determines the presence or absence of input data. If there is no input data (NO), it waits for input data, and if it exists (YES), it transfers this input data to boundary 1. (ST ₂ ). Next, in ST ₃ , it is determined whether a replacement truck has occurred or not.
In the case of NO, the processing of ST ₁ to ST ₂ is repeated.
In the case of YES, the input data is written into the spare track area 2 (ST ₄ ), and the spare track management sectors are sequentially added to the spare track management area 3 (ST ₅ ).

Next, in ST ₆ , it is determined whether or not the number of spare track management sectors has reached a predetermined number. If the number has not reached the predetermined number (NO), the process returns to ST ₁ and waits until the number reaches the predetermined number. , when the predetermined number is reached (if YES), a replacement track management index information sector is created.

Next, in _ST7 , the spare track management index information sector is written into the spare track management index information area 4.

By repeating the processing operations ST ₁ to _{ST 6} described above, the spare track management index information sector is written in the spare track management index information area 4.

Effects of the Invention As is clear from the detailed description above, according to the information management method for a non-erasable recording medium according to the present invention, every time the number of spare track management sectors reaches a predetermined number, the spare track management index information sector Since this system creates the following information and writes it to the alternate track management index information area, the amount of sectors to be read out is significantly reduced compared to the amount of sectors read from the alternate track management area as in the past. This has the outstanding effect of significantly shortening the readout time.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the physical configuration for realizing a logical address of a non-erasable recording medium used to implement the method of the present invention, and FIG. 2 is an explanatory diagram showing the format of an alternate track management sector according to the present invention. , FIG. 3 is an explanatory diagram showing the format of the alternate track management index information sector according to the present invention, FIG. 4 is a flowchart showing the operation of the system for implementing the method of the present invention, and FIG. 5 is a conventional erasing method. FIG. 6 is an explanatory diagram showing a physical configuration for realizing an impossible logical address of a recording medium. Similarly, FIG. 6 is an explanatory diagram showing the format of a conventional alternate track management sector. 1...Boundary, 2...Replacement track area, 3...Replacement track management area, 4...Replacement track management index information area.

Claims (1)

[Claims] 1. A replacement track management index information area is provided in a non-erasable recording medium having at least a replacement track management area, and a replacement track management sector is added to the replacement track management area each time a replacement track occurs. An information management method for a non-erasable recording medium, characterized in that when a predetermined number is reached, a spare track management index information sector is created and written in the spare track management index information area.