Information recording method and apparatus of optical disc

Details Information recording method and apparatus of optical disc Information recording method and apparatus of optical disc

1999-09-28

2003-04-08

Beausoliel, Robert (Department: 2184)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S006130

Reexamination Certificate

active

06546502

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an information recording method and apparatus of an optical disc, particularly, relates to an information recording method of a rewritable optical disc, which controls a process of writing information into a replacement sector to a secondary defective sector and improves a reading rate of data.
2. Description of the Related Art
Generally, a rewritable optical disc is composed of a lead-in area, a data area, and a lead-out area as shown in FIG.
1
. The data area is divided into a plurality of zones. A user region and a spare region are provided for each zone of the data area. In case that a defective sector is presented in a user region or a spare region, a recording/reproducing apparatus for an optical disc allocates a logical sector number to a sector in a spare region. Since a host computer makes access to an optical disc in accordance with a logical sector number, the host computer is not necessary to recognize a defective sector.
In a recording/reproducing system of a rewritable optical disc such as a DVD-RAM (Digital Video Disc- or Digital Versatile Disc-Random Access Memory), a defective sector is registered in 4 defect management areas (DMAs)
1
through
4
. which are provided in a lead-in area and a lead-out area as shown in
FIG. 1. A
recording/reproducing apparatus for an optical disc determines a logical sector number with referring the DMAs.
Each DMA comprises a DDS (Disc Definition Structure), a PDL (Primary Defect List), and a SDL (Secondary Defect List). A same defective sector information is recorded in the 4 DMAs. As shown in
FIG. 2
, PDL identification (ID) data and a number list of a primary defective sector, which are found while certifying a data area prior to utilizing an optical disc, are recorded in the PDL. As shown in
FIG. 3
, SDL ID data and a head sector number of a defective block, which are found while utilizing an optical disc, and a number list of a head sector of a spare block, which corresponds to the defective block, are recorded in a SDL. In addition thereto, all sectors included in the defective block, which is recorded in the SDL, are treated as a secondary defective sector and they are replaced by sectors included in the spare block corresponding to the defective block. Further, DDS ID data and certifying information are recorded in a DDS, although they are not shown.
Allocating a logical sector number to a sector in a spare region is performed by a method of slip replacement for a primary defective sector registered in a PDL and by a method of linear replacement for a secondary defective sector included in a defective block registered in a SDL.
A method of slip replacement is depicted in FIGS.
4
(
a
) and
4
(
b
). In case that no defective sector is presented, the method is shown in FIG.
4
(
a
). A physical sector number is allocated to a sector in a direction from an inner circumference to an outer circumference and is allocated to each sector provided in a user region and a spare region. A logical sector number is continuously allocated to each sector provided only in the user region.
In case that a defective sector is presented, the slip replacement is depicted in FIG.
4
(
b
). A logical sector number, which shall be basically allocated to the defective sector, is allocated to a first normal sector continuously succeeding the defective sector. Accordingly, if there existed “m0” defective sectors and “m1” defective sectors in the user region, a logical sector number is allocated to “(m0+m1)” replacement sectors slipping in the spare region. In this case, a logical sector number is allocated in numerical order of usable physical sector numbers.
On the other hand, a method of linear replacement is performed by a unit of block composed of 16 sectors, which are a minimum unit of reading and writing from/on a optical disc, with adding data for error correction as shown in
FIG. 5. A
physical sector number is allocated in a direction from an inner circumference to an outer circumference and assigned to each sector one by one as the same manner as that of the method of slip replacement shown in FIGS.
4
(
a
) and
4
(
b
). In case that “n0” defective blocks and “n1” defective blocks are presented in a user region as shown in
FIG. 5
, total “(n0+n1)” blocks in a spare region are assigned as replacement blocks. In the method of linear replacement, a logical sector number, which is originally allocated to a sector in a defective block, is allocated to a sector in a block secured in the spare region. Accordingly, sectors in the user region and sectors in the spare region are alternatively arranged in line, in case that those sectors are arranged in accordance with an order of logical sector number. Although defective sectors are designated in the user region in
FIG. 5
, the linear replacement is also applied to a sector of a defective block presented in the spare region.
According to the linear replacement mentioned above, an optical head of a recording/reproducing apparatus moves reciprocally from a user region to a spare region and vice versa at each time when reading from or recording to a sector, that is, a replacement sector of a secondary defective sector in a block by the linear replacement, which is a block of being secured in a spare region, occurs. It causes a problem of deteriorating an average transfer rate. Accordingly, in case that information are written in a digital video file, which is desired to be reproduced continuously, by applying the linear replacement frequently, reproduction of digital video, which is an operation of reading, may be intermittent.
SUMMARY OF THE INVENTION
Accordingly, in consideration of the above-mentioned problems of the prior art, an object of the present invention is to provide an information recording method of an optical disc, which is applied to such data as being seriously concerned about deterioration of reading rate, in order to eliminate such deterioration of reading rate by utilizing a process of linear replacement, which is a method of processing a replacement sector to a secondary defective sector in an optical disc.
In order to achieve the above object, the present invention provides, according to an aspect thereof, an information recording method of an optical disc, which performs a linear replacement process as a process of a replacement sector to a secondary defective sector in a rewritable data area provided in a rewritable optical disc, the information recording method comprising a step of reading out information from a file to be recorded on the optical disc, a step of discriminating an identification signal, a step of judging whether or not writing the file into a linear replacement sector is prohibited, a step of writing information into a predetermined region in the data area of the optical disc, and another step of writing data into another predetermined region in the data area of the optical disc, the information recording method is further characterized by whether or not writing information in the replacement sector to the secondary defective sector is performed when the information is written into the data area.
According to an aspect of the present invention, there provided an information recording method of an optical disc, which is a recording method of writing file data of being concerned about deterioration of reading rate while reproducing with avoiding recording the file data into a linear replacement sector.
According to another aspect of the present invention, there provided an information recording apparatus of an optical disc, which performs a linear replacement process as a process of a replacement sector to a secondary defective sector in a data area of rewritable provided in a rewritable optical disc, the information recording apparatus comprising means for reading out information from a file to be recorded on the optical disc, means for discriminating an identification signal, means for judging whether or not writing said file into a linear replacement sec

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