JP2007334940A - Defect management device for multilayer disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase registration efficiency to a defect list so that processing speed during writing is improved. <P>SOLUTION: When a certain recording layer of a multilayered optical disk 2 is accessed and an address of a defect area of the recording layer being accessed is detected, it is assumed that a defect exists in each recording layer at the same physical position when viewed from a disk surface or a defect such as flaw or dust exists in the disk surface. The address of the defect area of the recording layer being accessed and the addresses at the same physical position of the other recording layers are registered in the defect list 3 as the addresses of the defect area. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a defect management apparatus for a multilayer disk that registers the address of a defect area existing in the multilayer disk in a defect list provided in the multilayer disk.

  In recent years, there has been a demand for increasing the capacity of optical disks, and it is useful to use a plurality of recording layers in order to increase the capacity. On the other hand, if there is a defect in the recording layer of the optical disk or a defect such as a scratch or dust on the surface of the disk, defect management occurs, and defect management is necessary. In the conventional defect management method, write access fails due to the presence of a defect, and when the number of retries reaches the specified number of times, the address at that time is registered in the defect list in the disk, and the address where the defect exists is not used. It is common to record in an alternative area. In the case of a multi-layer disc, a defect list is generally provided for each layer, and when a defect is detected at the time of writing to each layer, the address is generally registered in the defect list.

Further, when real-time processing is performed at the time of writing as in the case of stream data, a problem occurs at the time of writing if processing of the defect management method at the time of writing takes time. In particular, in the case of a multi-layer disc, when referring to the defect list, the access light must be moved to each layer. Therefore, it is desirable to improve the efficiency of defect management. Therefore, as a conventional technique for improving the efficiency of defect management in a multilayer disk, for example, in Patent Document 1 below, an address registered at the time of detecting a defect is registered not only in the defect list of that layer but also in the defect list of other layers. Thus, there is a method for improving the efficiency of defect management by making it possible to obtain defect information of all the recording layers by referring to the defect list of one layer without the access light moving to another layer. .
JP 2001-14808 (abstract)

  However, in the technique described in Patent Document 1, only the address of a layer when a defect is detected is registered, and management of another layer different from that layer is not performed. That is, the address of a layer different from the address of the layer registered in the defect list is not registered. Therefore, if a defect exists in the same physical position as viewed from the disk surface of each recording layer of a multilayer optical disk, or if a defect such as a scratch or dust exists on the disk surface, writing on a layer fails due to the effect of the defect. However, even if the address at that time is registered in the defect list, when writing to the same physical position as seen from the disk surface of another layer at another opportunity, writing is performed due to the same defect detected previously. In this case, there is a possibility that it would be troublesome to register again in the defect list, and there was a waste of registration processing in the defect list at the time of writing.

  SUMMARY OF THE INVENTION In view of the above problems of the prior art, an object of the present invention is to provide a defect management device for a multi-layer disc that can improve the efficiency of registration in a defect list and improve the processing speed at the time of writing.

In order to achieve the above object, the present invention has a plurality of recording layers and occurs on the surface of a multi-layer disc in which addresses are allocated to the recording areas of the plurality of recording layers so as not to overlap each other between the recording layers. In the multi-layer disk defect management apparatus for registering position information indicating the position of the defect, in a defect list provided in a predetermined area of the multi-layer disk,
Storage means for storing in advance the respective addresses of the recording areas in the plurality of recording layers that have the same physical positional relationship in the vertical direction with respect to the disk surface;
Detecting means for accessing one recording layer of the plurality of recording layers and detecting an address of the recording area in the one recording layer corresponding to the defect area detected by the access;
The address of the recording area of the one recording layer corresponding to the defect area detected by the detecting means is registered in the defect list as position information of the defect, and the one recording is referred to by referring to the storage means. Means for registering an address of a recording area in another recording layer associated with a recording area in the layer in the defect list as position information of the defect;
It is characterized by having.

In order to achieve the above object, the present invention has a plurality of recording layers, and addresses are allocated to the recording areas in the plurality of recording layers according to a predetermined rule so as not to overlap each other. In the multi-layer disk defect management apparatus for registering position information indicating the position of the defect generated on the surface of the multi-layer disk in a defect list provided in a predetermined area of the multi-layer disk,
Detecting means for accessing one recording layer of the plurality of recording layers and detecting an address of the recording area in the one recording layer corresponding to the defect area detected by the access;
From the address of the recording area of the one recording layer corresponding to the defect area detected by the detection means, the physical positional relationship in the direction perpendicular to the disk surface is the same as the recording area of the one recording layer. Calculating means for calculating the address of each recording area in the other recording layer according to the predetermined rule;
The address of the recording area of the one recording layer corresponding to the position of the defect detected by the detecting means is registered in the defect list as position information of the defect, and the other recording layer calculated by the calculating means Means for registering the address of the recording area in the defect list as position information of the defect,
It is characterized by having.

  According to the present invention, it is assumed that a defect exists physically at the same position as viewed from the disk surface of each recording layer, or that a defect such as a scratch or dust exists on the disk surface. Since the address of the defect area and the address at the same physical position as seen from the disk surface of the other recording layer are registered in the defect list, the efficiency of registration in the defect list is improved and the processing speed at the time of writing is improved. Can do.

<First Embodiment>
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an optical disk device as a first embodiment of a multi-layer disk defect management device according to the present invention, and FIG. 2 is a flowchart for explaining processing of the optical disk device of FIG.

  The optical disk apparatus shown in FIG. 1 is roughly composed of a drive 1 and middleware 6. A multi-layer disc (hereinafter also simply referred to as a disc) 2, a defect detection device 4 and a writing device 5 are provided in the drive 1, and each layer of the disc 2 has an address indicating defect position information of each layer of the disc 2. Is provided with a defect list 3. The middleware 6 is provided with an address list (hereinafter simply referred to as an address list) 7 for each layer, a defect management device 8 and a drive control device 9, and the address list 7 contains addresses at the same physical position of each layer of the disk 2. Stored in advance so as to correspond.

  The writing device 5 in the drive 1 writes data to each recording layer of the disk 2, and the drive control device 9 in the middleware 6 controls the writing device 5. When writing by the writing device 5 has failed a specified number of times during this writing, a defect exists in the same physical position as viewed from the disk surface of each recording layer, or a defect such as a scratch or dust exists on the disk surface. In this case, the defect detection device 4 checks whether or not there is a defect on the disk 2. Here, it is not desirable to determine that there is a defect in the disk 2 only when the writing by the writing device 5 has failed a specified number of times. For this reason, the defect detection device 4 determines whether there is a defect in the disk 2, for example. As in Patent Document 1, detection is performed based on whether or not a defective sector is detected in an error correction block. The detection result is transmitted to the defect management device 8, and the defect management device 8 registers the address of the layer at the time of writing in the defect list 3 of each layer in the disk 2, and the disk surface of the other layer based on the address list 7 Are registered in the defect list 3 of each layer in the disk 2.

  The operation will be described in detail with reference to FIG. First, in step S1, writing to an address in a certain layer of the multilayer disk 2 is started. Next, in step S2, write data is read, and by comparing the read data with the write data, it is determined whether or not writing has failed. If unsuccessful, retry is made in step S3. In the subsequent step S4, it is determined whether or not the specified number of retries has been exceeded, and step S3 is repeated until the number is exceeded. If the specified number of retries is exceeded in step S4, processing for detecting the defect by the method described above is executed in step S5. In the subsequent step S6, it is determined whether or not there is a defect. If there is a defect, the address of the position where the defect exists is registered in the defect list 3 in step S7. In subsequent step S8, it is determined whether or not the disk 2 is a multi-layer disk. The address is registered in the defect list 3.

<Second Embodiment>
FIG. 3 is a block diagram showing an optical disk apparatus as a second embodiment of the defect management apparatus for a multilayer disk according to the present invention, FIG. 4 is a flowchart for explaining the processing of the optical disk apparatus in FIG. 3, and FIGS. FIG. 4 is an explanatory diagram showing defect area detection processing of the optical disc apparatus of FIG. 3. The optical disk apparatus shown in FIG. 3 is roughly configured by a drive 1 and middleware 6a, and the drive 1 has the same configuration as that of the first embodiment. In the middleware 6a, the same defect management device 8 and drive control device 9 as in the first embodiment are provided, and an address calculation device 10 is provided instead of the address list 7 in the first embodiment. In the present embodiment, it is assumed that a multi-layer disk in which addresses are allocated according to a predetermined rule is used. The “predetermined rule” is, for example, incrementing or decrementing one by one, adding or subtracting with a certain offset value, and the like.

  The operation will be described in detail with reference to FIGS. 4 and 5 to 7. 5 to 7 show a case where the defect 11 exists on the surface of the disk 2 having the two recording layers 12 and 13, and the access light 5a accesses the recording layer 12 through the defect 11. Show. First, in step S11 shown in FIG. 4, writing to an address in a certain layer of the multilayer disk 2 is started, and then in step S12, write data is read and whether or not writing has failed by comparing the read data with the write data. If it is unsuccessful, retry is made in step S13. In subsequent step S14, it is determined whether or not the specified number of retries has been exceeded, and step S13 is repeated until the number is exceeded. If it is determined in step S14 that the prescribed number of retries has been exceeded, a process for detecting defects by the method described above is executed in step S15.

  In the subsequent step S16, it is determined whether or not there is a defect. If there is a defect, the access position is changed as shown in FIGS. Here, in FIG. 5 and FIG. 6, the access light 5a accesses the recording layer 12 through the defect 11, so that it cannot be accessed. In FIG. 7, it can be accessed because it passes through the defect 11. Therefore, in step S18, it is determined whether or not access is possible, and step S17 is repeated until the accessible area is reached. As shown in FIG. 7, when the access light 5a passes through the defect 11 and becomes accessible, in step S19, the access is made from the distance traveled by the access light 5a (the size of the defect) and the address when the access light 5a becomes accessible. The address of the impossible area is calculated and registered in the defect list 3 in step S20.

  In step S21, it is determined whether or not the disk 2 is a multilayer disk. If the disk 2 is a multilayer disk, in step S22, the address calculator 10 assigns addresses of physically same areas in other layers according to the predetermined rule described above. Calculate and register in the defect list 3. In the subsequent step S23, it is determined whether or not the address of the physically same position of another layer has been calculated. If there is a layer that has not yet been registered, it is determined that all layers have been registered in the defect list 3. Step S22 is repeated until it is done.

1 is a block diagram showing an optical disc device as a first embodiment of a defect management device for a multilayer disc according to the present invention; FIG. 3 is a flowchart for explaining processing of the optical disc apparatus in FIG. 1. It is a block diagram which shows an optical disk apparatus as 2nd Embodiment of the defect management apparatus of the multilayer disk based on this invention. 4 is a flowchart for explaining processing of the optical disc apparatus of FIG. 3. It is explanatory drawing which shows the defect area | region detection process of the optical disk apparatus of FIG. It is explanatory drawing which shows the defect area | region detection process of the optical disk apparatus of FIG. It is explanatory drawing which shows the defect area | region detection process of the optical disk apparatus of FIG.

Explanation of symbols

1 drive 2 multilayer disk (disk)
3 Defect List 4 Defect Detection Device 5 Writing Device 5a Access Light 6, 6a Middleware 7 Address List of Each Layer (Address List)
8 Defect management device 9 Drive control device 10 Address calculation device 11 Defects 12 and 13 Recording layer

Claims (2)

Position information indicating a position of a defect generated on the surface of the multi-layer disc having a plurality of recording layers and having an address assigned to each recording area in the plurality of recording layers so as not to overlap between the recording layers, In the defect management device for a multi-layer disc registered in a defect list provided in a predetermined area of the multi-layer disc,
Storage means for storing in advance the respective addresses of the recording areas in the plurality of recording layers that have the same physical positional relationship in the vertical direction with respect to the disk surface;
Detecting means for accessing one recording layer of the plurality of recording layers and detecting an address of the recording area in the one recording layer corresponding to the defect area detected by the access;
The address of the recording area of the one recording layer corresponding to the defect area detected by the detecting means is registered in the defect list as position information of the defect, and the one recording is referred to by referring to the storage means. Means for registering an address of a recording area in another recording layer associated with a recording area in the layer in the defect list as position information of the defect;
A defect management device for a multilayer disk, comprising: The position of a defect generated on the surface of a multi-layer disc having a plurality of recording layers and having addresses assigned to each recording area in the plurality of recording layers so as not to overlap between the recording layers. In the multi-layer disk defect management device for registering the position information shown in a defect list provided in a predetermined area of the multi-layer disk,
Detecting means for accessing one recording layer of the plurality of recording layers and detecting an address of the recording area in the one recording layer corresponding to the defect area detected by the access;
From the address of the recording area of the one recording layer corresponding to the defect area detected by the detection means, the physical positional relationship in the direction perpendicular to the disk surface is the same as the recording area of the one recording layer. Calculating means for calculating the address of each recording area in the other recording layer according to the predetermined rule;
The address of the recording area of the one recording layer corresponding to the position of the defect detected by the detecting means is registered in the defect list as position information of the defect, and the other recording layer calculated by the calculating means Means for registering the address of the recording area in the defect list as position information of the defect,
A defect management device for a multilayer disk, comprising:

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