JP2000268506A - Optical disk drive and optical disk recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make recordable music and picture information without missing by providing an optical disk drive with a memory that can store address information of defective blocks and an alternate block respectively as management information so as to eliminate the need for access of an optical head to a recording management area on an innermost circumference of an optical disk every time the optical head is replaced thereby reducing the time required for the replacement. SOLUTION: A CPU 10 of the optical disk drive 10 controls operations off each section, a 1st memory 20 stores a system operating program and data or the like, and a 2nd memory 30 stores an alternate information table. When the CPU 10 finds out a defective block in the case of recording data on an optical disk 200, the CPU 10 writes address information of the defective block and an alternate block as management information and updates the alternate information table. Thus, it is not required for an optical head 60 to access to a management area of the optical disk 200 during data recording so as to continuously record the data without interruption or stop of the recording.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to an optical disk drive, and more particularly, to an optical disk drive having a memory capable of managing replacement information of an optical disk and an optical disk recording method. The present invention provides, for example, MO,
It is suitable for rewritable optical disk drives such as ASMO, MD-DATA, DVD-RAM, and PD.

[0002]

2. Description of the Related Art ASMO (Advanced Store)
The Age Magneto Optical Disk is a magneto-optical (MO) disk having a storage capacity of 6 GB or more and allowing a user to freely write information.
Typically, with respect to the disk radial direction (track direction),
It has a recording management area provided on the innermost and outer circumferences, and a plurality of bands sandwiched therebetween. The recording management area is sometimes called a lead-in area and a lead-out area. However, which of the outer and inner recording management areas is assigned to the lead-in area and the lead-out area is a matter of specifications and is optional. .

The recording management area includes a recording / reproducing method for the entire disc, a position of a data area (for example, replacement area information described later), and other management information (for example, security data).
This is an area where the user cannot rewrite. Conventionally, management information has been redundantly recorded in two recording management areas on the inner and outer peripheries in order to improve reliability, and further typically has been typically recorded twice in one recording management area. As a result, one piece of management information was recorded four times in the recording management area on the inner and outer circumferences. This is due to empirical reasons such that when the disk is eroded by rust, either the inner or outer recording management area often becomes impossible.

[0004] On the other hand, each band is an area that can be accessed by a user, and typically includes a data area and a replacement area. The data area is an area for storing predetermined data recorded by the user. The replacement area stores a substitute block for a defective block (sector) existing in the user area. Therefore, if there is no defect in the data area, no data is written in the replacement area. The address of the replacement area is written in the above-mentioned recording management area.

[0005] In the ASMO, the length of one sector is made the same to make the recording density of each track substantially constant. Since the distance in the circumferential direction (sector direction) increases from the inner circumference to the outer circumference of the disk, the number of sectors increases from the inner circumference to the outer circumference. Each band is conceptually composed of one data area and one spare area corresponding to the data area, and the arrangement of the sectors (physical format) is a CLV (Constant Linear Veer).
location) method, CAV (Constant Ang)
ultra-Velocity) system and ZCAV (Zo
ne Constant Angular Veloci
ty) method. For example, CAV method and ZC
In the AV system, the rotation speed (angular speed) is substantially constant at the inner and outer circumferences and the synchronous clock frequency for recording and reproduction is changed.
The SMO employs a CLV method in which the clock frequency between bands is made equal by changing the rotation speed.

[0006]

In a conventional ASMO, if a defective area exists in a data area during recording and a spare area is used, the optical head moves to a recording management area on the innermost and outermost circumferences of the disk. This information must be written. However, since three different rotation speeds are assigned to the innermost and outer circumferences and the band, a large amount of power is required for the rotation drive control of the motor for this writing. Also,
Since the optical head has to move from the band to the innermost and outermost recording management area, it takes a long access time. For this reason, when the ASMO records, for example, music or images to be continuously recorded (for example, a movie), information recording may be omitted due to the access time required at the time of replacement, or the recording may not be performed. The operation sometimes stopped at that point. This is not a problem peculiar to the CLV method. Even if the CAV method or the ZCAV method is adopted, the optical head must move to the innermost and outermost recording management area at the time of replacement. Was hanging.

[0007]

SUMMARY OF THE INVENTION Accordingly, it is a general object of the present invention to provide a new and useful optical disk drive and an optical disk recording method which solve the above-mentioned conventional problems.

More specifically, the present invention provides an optical disk drive and an optical disk recording method capable of recording music and images (for example, movies and the like) without any information leakage by shortening the time required for replacement as compared with the related art. This is an exemplary object of the present invention.

It is another exemplary object of the present invention to provide an optical disk drive and an optical disk recording method that can save power used when replacing an optical disk that adopts the CLV method as a physical format, as compared with the related art.

An optical disk drive according to claim 1 is an optical head capable of accessing an optical disk having a data area in which a user can access and store desired data and a spare area, wherein the spare area is An optical head capable of providing an alternative replacement block for a defective block that may exist in a data area; a memory capable of storing information on addresses of the defective block and the replacement block as management information; A signal processing device that processes a signal that a head records on and / or reproduces from the optical disk; a driving unit that drives the optical disk, the optical head, the memory, and the signal processing device; A control unit that controls operations of the memory, the signal processing device, and the driving unit; The optical disk drive according to the present invention has a memory capable of storing information on addresses of defective blocks and replacement blocks as management information. Therefore, if such a memory is used to temporarily record replacement information, the optical head does not need to access and update the recording management area provided on the innermost and outermost circumferences of the optical disk every time replacement is performed.

According to a second aspect of the present invention, predetermined data is recorded in the data area of an optical disc having a data management area storing a management information and having a data area accessible by a user and a spare area. Recording the predetermined data in a replacement block of the replacement area when a defective block exists in the data area; and storing information of respective addresses of the defective block and the replacement block in a memory. And recording the stored address information in the recording management area as a part of the management information. According to the recording method of the present invention, the address information of the defective block and the replacement block is stored in the memory before being recorded in the recording management area. Although the memory of the optical disk drive is typically used as the memory, the use of the memory of the personal computer connected to the optical disk drive or other external memory is not excluded. Typically, the data is stored in the recording management area from the memory when the system is stopped or immediately before the optical disk is ejected from the optical disk drive.
However, if the memory can store replacement information including two or more replacement block addresses and transfer it collectively to the recording management area, it is more efficient than the optical head updating the recording management area each time replacement is performed.

A recording method according to claim 3 dependent on claim 2, further comprising a step of erasing the information of the address recorded in the memory after the step of recording in the recording management area. Thereby, the memory can correspond to another optical disk. If the memory is configured as a volatile memory of an optical disk drive, the erasing step of the present invention comprises:
For example, this corresponds to a step of turning off the power of the optical disk drive.

According to a fourth aspect of the present invention, there is provided a recording method for recording predetermined data in the data area of an optical disc having a data area accessible by a user and a spare area and having a recording management area storing management information. Recording the predetermined data in a spare block of the spare area when a defective block is present in the data area; and transmitting information of respective addresses of the defective block and the spare block to a part of the optical disc. Temporarily storing the address information temporarily stored in the recording management area as a part of the management information, and the temporarily stored address information. Erasing. According to the recording method of the present invention, the address information of the defective block and the replacement block is temporarily stored on the optical disk before being recorded in the recording management area. Typically, the data is recorded in the recording management area when the system is stopped or immediately before the optical disk is ejected from the optical disk drive. However, the optical disc can have one or a plurality of areas for temporarily storing, and each area can store replacement information including one or a plurality of replacement block addresses. If replacement information including a plurality of replacement block addresses can be collectively transferred to the recording management area, it is more efficient than the optical head updating the recording management area every time replacement is performed.

[0014] Further objects and other features of the present invention will become apparent in preferred embodiments thereof described with reference to the accompanying drawings.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical disk drive 100 according to the present invention will be described with reference to FIG. Here, FIG. 1 is a conceptual block diagram of the optical disk drive 100. The optical disk drive 100 includes a CPU 10 and a first
Memory 20, the second memory 30, and the signal processing circuit 4
0, the drive unit 50, the optical head 60, and the drive control unit 70
And an interface unit 80, and the optical disc 2
00 can be detachably stored.

The CPU 10 controls the operation of each unit. First
The memory 20 is configured as, for example, a non-volatile memory such as a ROM, and stores operation programs and data of the system. The second memory 30 stores, for example, RA
It is configured as a volatile memory such as M, and stores a replacement information table described later with reference to FIG. The first and second memories 20 and 30 may be configured as one memory device, and one of the first and second memories 20 and 30 stores ID information that can be assigned to each optical disc. Is also good.

The signal processing circuit 40 processes a signal recorded on the optical disk 200 by the optical head 60 and a signal reproduced from the optical disk 200. The drive unit 50 is an optical disk 200
And a drive mechanism for driving the optical head 60 and other drive systems, and are controlled by the drive control unit 70 (for example, rotation control of the motor). The interface unit 80 connects the optical disk drive 100 to an external device such as a personal computer as a host device.
In addition, since any configuration known in the art can be applied to each component, a detailed structure of each part is omitted here.

FIG. 3 shows an optical disk drive 10 according to the present invention.
0 shows a typical configuration of the optical disc 200 applicable to the optical disc 200. In the figure, the horizontal direction is the direction in which blocks called sectors are aligned, and the vertical direction is the track direction. The optical disc 200 is, for example, an MO, ASM
This is a rewritable optical disk such as O, MD-DATA, DVD-RAM, and PD.

The optical disc 200 has a recording management area 210a located at the innermost circumference, a management area 210b located at the outermost circumference, and a plurality of bands (bands 1 to N) 2401 to 2401 arranged between the innermost and outer circumferences. 240n (hereinafter collectively referred to as "band 240" unless otherwise specified). Each band includes data areas 2201 to 220n (hereinafter collectively referred to as “data area 220” unless otherwise specified).
Replacement areas 2301 to 230n (hereinafter, collectively referred to as “replacement area 230” unless otherwise specified). Either of the recording management areas 210a and 210b (hereinafter collectively referred to as the “recording management area 210” unless otherwise specified) may be the lead-in area or the lead-out area. Let 210a be a lead-in area where an optical head (not shown) starts reading on the optical disk 200 first.

Each recording management area 210 stores the recording method of the entire disc, information of each area (the number of bands, the band position, the position of the data area 220, the position of the spare area 230, etc.), and the security information of the disc. . As described above, the recording management area 210 stores management information on the entire disc. In addition to this, the recording management area 210
Further stores management information including replacement information of each band (that is, address information of defective blocks and replacement blocks). Each record management area 210 stores the same contents redundantly, thereby improving the reliability of the management information. Also,
Management information can be multiplexed and recorded in the same recording management area 210. For example, each record management area 2
If 10 stores the management information twice, the same management information will exist at four places on the optical disc 200. The record management area 210 is an area where the user cannot rewrite.

The optical disk 200 exemplarily employs the CLV method, and the rotation speed in each band 240 is constant, but the rotation speed between different bands 240 is different.
Since the CLV method is well known in the art, a detailed description is omitted here. Each band 240 includes a data area 220 and a replacement area 230 accessible to the user. The user of the optical disc 200 can record desired data (eg, software programs, documents, music, images, movies, surveillance data, etc.) in the data area 220 in a manner known in the art.

The replacement area 230 is an area for providing a replacement block for replacing a defective block (sector) when the data area has a defective block (sector). Therefore, if there is no defective block, the replacement block information is not stored.

Normally, if a defective block is found in the data area 220 at the time of the initial inspection performed before the manufacturer ships the product, no data is stored in the data area 220 yet, so that the next block after the defective block is detected. Blocks can be addressed instead of defective blocks, and this replacement information is stored in the record management area 210. Therefore,
This replacement method does not involve the replacement area 40. This replacement method is based on PDL (Primary Defect Lis
It is commonly known as t). On the other hand, if a defective block occurs in the data area 220 while the user is using the optical disc 200, the replacement area 230 provides a replacement block. This replacement method is based on SDL (Secondary).
y Defect List). The recording management area 210 stores both PDL and SDL as management information.

The recording management area 210 stores the defective block address of the data area 220 of each band 240 and the replacement area 2
30 replacement block addresses are stored as an exchange information table as shown in FIG.

In the conventional optical disk drive, if a defective block occurs and a replacement block is allocated while desired data is being recorded in the data area 220, the replacement information is written to the recording management area every time replacement is performed. I was writing 210. Since the optical head had to move to the innermost and outermost recording management areas 210, it took a long time to move. As a result, the replacement process interrupts or stops the recording operation, and it has not been possible to successfully record continuously recorded music or image information. When the optical head accesses and updates the recording management area 210, the drive unit 50 changes the rotation speed of the optical disk 200 between the inner and outer circumferences. Since the rotation speed of the motor had to be changed, much power was required.

Hereinafter, a method of recording desired data on the optical disk 200 shown in FIG. 3 by a user will be described with reference to FIG. Here, FIG. 4 is a flowchart illustrating an exemplary recording method of the present embodiment.

Start-up processing step 1100 shown in FIG.
3, includes a step 1102 of reading the management area 10 and a step of reading the management area 20 of each band 50, as shown in FIG. The startup process is performed on the optical disk 1
When 00 is inserted into a disk drive (not shown), it is a pre-process of the recording process that is automatically performed only once in principle, regardless of the data that the user intends to record.

In step 1002, the recording management area 210
This is a start-up process for reading a and / or 210b.
Therefore, the optical head 60 (not shown) of the optical disk drive 100 accesses the recording management area 210a and / or 210b. If one of the recording management areas cannot be read because the optical disc 200 is eroded by rust or the like, the other recording management area is always accessed. However, if either one can be read, the other reading may be omitted.
Further alternatively, when each recording management area records management information in a multiplex manner, reading of redundant information at the time when the management information is recognized may be omitted.

The read management information corresponds to the second management information shown in FIG.
Is stored in the memory 30. Optionally, the read management information is additionally stored in a memory (for example, RAM) of a personal computer connected to the disk drive. If necessary, a security check (collation of an ID or a password) may be performed based on the management information. As a result of the step 1002, the disc drive (not shown) recognizes how to control the optical disc 100 and the replacement information table already stored.
As a result, a desired replacement information table is formed in the second memory 30.

Thereafter, steps 1004 to 1010 in FIG.
The writing process shown in FIG. 14 is performed. The writing process is
This is a process in which the user records desired data in the replacement area 230 complementarily to the data area 220. As shown in FIG. 4, first, the user writes data in the data area 220 (step 1004). Next, if no defective block is found in the data area 220 in step 1006, it is determined whether or not all data has been written (step 1008). If all data has been written, the writing process ends, and the process proceeds to step 1016 to be described later. I do.

On the other hand, if a defective block is found in step 1006, the defective block is assigned to a replacement block in the replacement area 230 (step 1010). In principle, replacement blocks are assigned in order of addresses, but for security or other reasons, replacement blocks of desired addresses can be assigned to defective blocks.
If it is determined in step 1012 that the writing to the replacement block has been completed normally, the address information of the defective block and the replacement block is written to the second memory 30 as management information, thereby updating the previous replacement information table. (Step 1014). Next, data is similarly recorded from the sector having the address next to the defective block in the data area 220.

However, if it is determined in step 1012 that writing to the replacement block is not completed normally, the replacement block is also a defective block, so the next replacement block is allocated in step 1010. This subroutine continues until a normal (defective) replacement block is found. In this case, the replacement source sector written to the second memory 30 is not a defective replacement block but a defective block in the data area 220.

In step 1014, the optical head 60
Does not need to access the management area 210, and the replacement information table is automatically updated in the second memory 30 in the system. Therefore, even if the user wants to write music or a movie, the recording is interrupted or stopped. And can be continuously recorded without any success. In step 1014, since the disk rotation speed does not need to be changed, the power consumed at the time of replacement is smaller than that in the related art.

After the recording operation is completed, the replacement information table formed in the second memory 30 is moved to the recording management area 210, for example, when the system is stopped or immediately before the optical disk is ejected from the optical disk drive (step 101).
6). Thus, the record management area 210 can store the latest replacement information table after all the replacement operations.

Alternatively, the replacement information table formed in the second memory 30 is copied to the recording management area 210. Thereafter, the contents of the second memory 30 are preferably erased. However, if the second memory 30 is configured as a volatile memory such as a RAM, the contents of the second memory 30 are automatically erased when the power of the optical disk drive 100 is turned off. If the second memory 30 is configured as a rewritable non-volatile memory, a step of clearing the second memory 30 after copying the replacement information table to the recording management area 210 will be added. By clearing the second memory 30, it becomes possible to support another optical disk. Since a person skilled in the art can construct a software program from the disclosure of this specification, detailed description will be omitted here.

The replacement information table updated at each replacement is not formed in the second memory 30 of the optical disc drive 100,
The replacement information table is temporarily formed in the replacement area 230 and other areas on the optical disc 100, and the replacement information table is stored in the recording management area 210.
May be deleted after being updated as shown in step 1016. Optical disc 100 on which replacement information table is formed
If the upper position is located between the innermost and outer circumferences, the replacement time can be reduced as compared with the conventional case. The replacement information table may be formed in one place of the optical disc 100, or may be formed by being divided into a plurality of places. For example, the replacement area 23 between each band
It is preferable to use a part of 0. Thus, the drive unit 50 can form the replacement information table without changing the disk rotation speed.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the invention. For example, step 10
At 16, the second memory 30 collectively writes the replacement information table to the recording management area 210, but the replacement information table including at least two or more new replacement block address information is simply written in the recording management area 210. This makes the replacement process more efficient. Further, for example, the optical disk 200 may adopt the CAV method or the ZCAV method. In this case, the clock frequency is changed instead of the disk rotation speed.

[0038]

According to the first aspect of the present invention, there is provided an optical disk drive having a memory capable of storing address information of defective blocks and replacement blocks as management information. Therefore, if such a memory is used to temporarily record replacement information, the optical head does not need to access and update the recording management area provided on the innermost and outermost circumferences of the optical disk every time replacement is performed. As a result, music and image data can be successfully recorded without any information leakage.
In addition, since the optical head does not need to move to the innermost circumference and return upon replacement, there is no need to change the disk rotation speed or the clock frequency, and power can be saved.

According to the recording method of the present invention, the address information of the defective block and the replacement block is stored in the memory before being recorded in the recording management area. Typically, the memory of the optical disk drive is used as the memory,
This does not preclude the use of personal computer memory or other external memory connected to the optical disk drive. Typically, the data is stored in the recording management area from the memory when the system is stopped or immediately before the optical disk is ejected from the optical disk drive. But memory is 2
If replacement information including one or more replacement block addresses can be stored and transferred collectively to the recording management area, it is more efficient than the optical head updating the recording management area each time replacement is performed. According to the recording method of the present invention, music and image data can be successfully recorded without any information leakage. In addition, since the optical head does not need to move to the innermost circumference and return upon replacement, there is no need to change the disk rotation speed or the clock frequency, and power can be saved.

According to a third aspect of the present invention, after the step of recording in the recording management area, the method further comprises a step of erasing the information of the address recorded in the memory. Thereby, the memory can correspond to another optical disk. If the memory is configured as a volatile memory of the optical disk drive, the erasing step of the present invention corresponds to, for example, a step of turning off the power of the optical disk drive.

According to the recording method of the present invention, the address information of the defective block and the replacement block is temporarily stored on the optical disk before being recorded in the recording management area. Typically, the data is recorded in the recording management area when the system is stopped or immediately before the optical disk is ejected from the optical disk drive. However, the optical disc can have one or a plurality of areas for temporarily storing, and each area can store replacement information including one or a plurality of replacement block addresses. If replacement information including a plurality of replacement block addresses can be collectively transferred to the recording management area, it is more efficient than the optical head updating the recording management area every time replacement is performed.

[Brief description of the drawings]

FIG. 1 is a partial schematic block diagram of an optical disk drive according to an embodiment of the present invention.

FIG. 2 is an example of a replacement information table formed as a result of the processing shown in FIG. 3;

FIG. 3 is a block diagram showing a typical configuration of an optical disc applicable to the optical disc drive shown in FIG.

FIG. 4 is a flowchart of a recording method according to an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 optical disk drive 10 CPU 20 first memory 30 second memory 40 signal processing circuit 50 drive unit 60 optical head 70 drive control unit 80 interface unit 200 optical disk 210a recording management area 210b recording management area 2201 to n data area 2301 to n Alternate area 2401 to n bands

Claims (4)

[Claims] An optical head capable of accessing an optical disc having a data area in which a user can access and store desired data and a spare area, wherein the spare area may be located in the data area. An optical head capable of providing an alternative replacement block for a block; a memory capable of storing information of respective addresses of the defective block and the replacement block as management information; And / or a signal processing device for processing a signal reproduced from the optical disk, a driving unit for driving the optical disk, the optical head, the memory, and the signal processing device; and an optical head, the memory, the signal processing device, An optical disk drive having a control unit for controlling the operation of the drive unit. 2. A process for recording predetermined data in the data area of an optical disk having a data area accessible by a user and a spare area, and having a recording management area storing management information; A step of recording the predetermined data in a replacement block of the replacement area when a defective block exists; a step of storing information of respective addresses of the defective block and the replacement block in a memory; Recording the information of the address as a part of the management information in the recording management area. 3. After the step of recording in the recording management area,
3. The recording method according to claim 2, further comprising a step of erasing the information of the address recorded in the memory. 4. A process for recording predetermined data in the data area of an optical disc having a data management area storing a management information and having a data area accessible by a user and a spare area; A step of recording the predetermined data in a replacement block of the replacement area when a defective block exists; and a step of temporarily storing information of respective addresses of the defect block and the replacement block in a part of the optical disk. Recording the temporarily stored address information as a part of the management information in the recording management area; and erasing the temporarily stored address information. Optical disc recording method.