JPH0289259A - Alternating area controlling system for optical disk device - Google Patents

Abstract

PURPOSE:To speed up alternating processing by forming an alternating directory area for storing information indicating a recorded area in an alternating area. CONSTITUTION:An alternating directory area 14 for storing information indicating the recorded area of the alternating area 12 is newly formed. At the time of accessing the alternating area, a leading empty area in the alternating area 12 is retrieved on the basis of the contents of the area 14, and after ending alternating writing in the leading empty area, information indicating newly generated recorded area is stored in the area 14. When an alternating factor is generated in a user area 10, the leading position of the empty area in the area 12 is known from the information of the recorded area of the area 12 obtained by the reading of the area 14 and a head is positioned on a directory. Consequently, access time at the time of generating an alternating factor can be suppressed always at a minimum time independently of the using capacity of the alternating area.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a replacement area management method for a write-once optical disk device that is provided with a replacement area that is accessed when a replacement factor occurs in the user area. A new alternate directory area is created to store information indicating the recorded areas of After the recording is completed, the information of the newly generated recorded area is stored in the alternate directory area.

[Industrial Field of Application] The present invention relates to a replacement area management method for a write-once optical disc device that includes a replacement area that is accessed when a replacement factor occurs in a user area.

In write-once optical disk devices, the media format is divided into a user area and a replacement area, and when the replacement area is accessed, a free area is searched from the beginning of the replacement area, so the usage pattern of the replacement area is As the number increases, it takes more time to access to find free space.

However, in a write-once optical disc device, it is required to always search for an empty replacement area in a short access time, regardless of the frequency of use of the replacement area.

[Prior art] The medium format of conventional write-once optical disc devices is M4.
As shown in the figure, it is divided into a user area 10 and a replacement area 12. If a replacement factor such as a track failure occurs during write access to the user area 10, an unrecorded replacement area is searched from the start address of the replacement area 12. Then, data is alternately written at the beginning of the unrecorded alternate area.

That is, as shown in the operation flow diagram of FIG.
When the replacement factor is determined in step S2 in the write operation of the first user area, the process proceeds to step S3, where the head address A of the replacement area is set to position the head, and the head address A is read in step S4. When it is determined in the next step S5 that address A has been recorded, the first address A is incremented in step S6, and the process returns to step S4 again, and the processes of steps 84 to S6 are repeated until it is determined in step S5 that it has not been recorded. If it is determined that there is no recording, step 87 is selected and alternate writing is performed at the beginning of the unrecorded alternate area.

[Problems to be Solved by the Invention] However, in such a conventional replacement area management system of a write-once optical disk device, when a replacement factor occurs, an unrecorded area is searched from the start address of the replacement area. Since the search is repeated sequentially, there is a problem in that the access time becomes longer as the consumption of the replacement area increases, that is, the usage m of the replacement area increases.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a replacement area management method for an optical disk device that achieves high-speed replacement processing regardless of the usage amount of the replacement area. shall be.

[Means for solving problems] FIG. 1 is a diagram explaining the principle of the present invention.

In FIG. 1, the present invention deals with a write-once optical disk device having a replacement area 12 which is accessed and data is written when a replacement factor occurs in the user area 10.

In the alternate area management system of the present invention for such a write-once optical disk device, an alternate directory area 14 is newly provided to store information indicating recorded areas in the alternate area 12, and the alternate directory area 14 is newly provided to store information indicating recorded areas in the alternate area 12, and the alternate area management method of the present invention provides a new alternate directory area 14 for storing information indicating recorded areas in the alternate area 12. Directory area 14
The first free area (the first position of the unrecorded area) in the replacement area 12 is searched based on the contents of the replacement area 12, and the newly created recorded area in the replacement directory area is searched for after replacement writing to the first empty area is completed. Configure it to store the information shown.

[Operation] According to the replacement area management method of the write-once optical disk device of the present invention having such a configuration, when a replacement factor occurs in the user area, first the replacement area obtained by reading the replacement directory area is The head can be positioned directly by knowing the starting position of the empty area in the replacement area from the information of the recorded area in the storage area, and the access time can always be reduced in the event of a replacement factor, regardless of the amount of usage of the replacement area. can be minimized.

[Embodiment] Fig. 2 is a block diagram showing an embodiment of the present invention.
(b) shows the sector format of the newly provided alternate directory area, and FIG. 3(C) shows an example of the recording state of the alternate directory area.

First, as shown in FIG. 2(a), in addition to the conventional user area 10 and replacement area 12, the medium format of the add-on optical disk device of the present invention includes a new replacement area 12.
An alternate directory pirate 14 is provided in front of the. This alternate directory area 14 stores information regarding recorded areas of the alternate area 12, specifically information indicating recorded tracks.

Assuming that the alternate area 12 is in the usage state shown in FIG. M2 (C4), for example, the alternate directory area 14 stores the sector format shown in FIG. 4(b).

That is, the sector format shown in FIG. 2(b) is composed of an ID section 16, a record mark 18, and a data section 20. In the data section 20, there is a replacement track mark corresponding to a used track in the replacement area 12. 22 is stored.

Therefore, if an alteration factor such as a sector defect occurs during a write operation in the user area fd10, the alternating directory area 14 is first read, and the alternating The number of used tracks can be known from the track marks 22.

As a result, the starting position of the unrecorded area in the replacement area 12,
That is, by knowing the track address of the unrecorded leading track, the head can be directly positioned at the leading track of the empty area in the alternate area Vi12.

FIG. 3 is an operational flow diagram showing control processing of the alternate area management system of the present invention.

In FIG. 3, a write operation is first performed on the user area 10 in step S1, and when it is determined in step S2 whether a change factor has occurred during this user area write, the change process from step S3 onwards is performed.

In this replacement process, first, in step S3, the replacement directory area 14 is read, and the number of replacement track marks 22 written in the data section 20 in the sector format shown in FIG. 2(b) is determined. Then step S4
By multiplying the number of alternate sector marks 22 by the number of sectors per track, the total number A of sectors in the recorded area in the alternate area 12 is obtained.

Next, the process proceeds to step S5, and by adding the total number of recorded sectors A obtained in step $4 to the start address of the replacement area 12, the sector address indicating the start track address of the unrecorded area (empty area) in the replacement area 12 is obtained. Calculate A.

Next, in step S6, the head is positioned at sector address A, which indicates the beginning position of the unrecorded area of the alternate area 12 calculated in step S5, and read, and when it is determined that there is no recording in the next step S7, the process proceeds to step S9. Then, alternate writing is performed in the alternate area 12.

On the other hand, if the appropriate sector position in the unrecorded first track of the replacement area has been recorded, step S6
Regarding the read of the first sector address A in step S7, it is determined in step S7 that it has been recorded, and the process advances to step S8.
Step 86 to increment the sector address with υ and return to step S6 to read the next sector.
The process of S8 is repeated, and when an unrecorded sector in the unrecorded head track is determined, the process advances to step S9 to perform alternate writing.

Furthermore, if alternate writing is performed at the beginning position of the unrecorded area of the alternate area 12 in step S9, and the sector address at the time of this alternate writing is the final sector address of one track, this alternate track is not analyzed. A corresponding replacement track mark 22 is stored in the replacement directory area 14 to indicate that the recording has been completed.

In the above embodiment, the alternate directory area 1
4, the alternate track mark 22 indicating the number of recorded tracks in the alternate area 12 is stored as an example, but it is also possible to simultaneously store a mark indicating the number of recorded sectors in one track. In this case, it is possible to know the unrecorded leading track and the recorded sectors in the track during the replacement process, and in this case, steps 86 to S8 in FIG.
Since the repeating process is no longer necessary, the replacement process can be further sped up.

[Effects of the Invention] As explained above, according to the present invention, the usage status of the alternate directory area can be determined from the contents of the alternate directory area.
There is no need to search the replacement area from the beginning to find a free area, and regardless of the amount of use of the replacement area, high-speed replacement processing is possible and the access time of the replacement area can be shortened.

[Brief explanation of the drawing]

Figure 1 is a diagram explaining the principle of the present invention. Figure 2 is a configuration diagram of an embodiment of the present invention. Figure 3 is an operational flow diagram of the present invention. Figure 4 is a diagram explaining the format of the conventional method. Figure 5 is a diagram of the conventional method. It is a legal operation tallow diagram. In the figure, user area replacement area replacement directory area ID section record mark data section replacement track mark

Claims (1)

[Claims] (1) In a write-once optical disc device equipped with a replacement area (12) that is accessed and data is written when a replacement factor occurs in the user area (10), a recorded area in the replacement area (12) is An alternate directory area (14) is provided for storing information indicating the alternate directory area (14), and when the alternate directory area (12) is accessed, the alternate directory area (14) is
Based on the contents of step 4), a leading free area in the replacement area (12) is searched, and after replacement writing to the starting empty area is completed, a new recorded replacement area is created in the replacement directory area (14). 1. A replacement area management method for an optical disk device, characterized in that information indicating information is stored.