JP2003085765A - Optical disk device and method for erasing data on optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device which stabilizes the recording quality of an optical disk by adjusting the frequency in recording throughout the optical disk. SOLUTION: When a written optical disk 3 is erased in an optical disk device 2 for recording and erasing information on the rewritable optical disk 3 through a host computer 1, the end of recorded data is searched, and all the areas following the end of recorded data are erased to adjust the frequency in recording throughout the optical disk 3, and thereafter the optical disk 3 is essentially erased throughout.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device for recording and erasing information on a rewritable optical disk such as a CD-RW and a recorded data erasing method for the optical disk.

[0002]

2. Description of the Related Art As a method of erasing an optical disk such as a CD-RW in which data has already been written, there are a full erasure and a simple erasure. Full erasure is a method of erasing the entire area of the optical disc from the innermost circumference to the outermost circumference. Erasing in this case is actually writing because it is writing an erase pattern. On the other hand, the simple erasing is a method of simply erasing the optical disc, and the PMA in which the management information of the optical disc is written without erasing the entire surface of the optical disc.
(Program Memory Area), TOC
(Table OF contents) and Pre-g
This is a method of erasing ap.

However, when erasing an optical disc in which a medium of a small capacity is written, the number of times of recording differs between the inner circumference and the outer circumference, whichever erasing method is selected. For example, considering the case of erasing an optical disc on which data for a new medium 20 minutes has been written, when performing full erasing, since the erased pattern is written in the written data portion (up to 20 minutes on the inner circumference), the number of recordings Is twice (the number of overwrites is one), and the erase pattern is written in the unrecorded area (after 20 minutes) after that, so the number of recordings is one.

Even when the simple erasing is used, PMA, TOC, Pre in which the management information of the optical disc is written.
Since only the -gap area is erased, the number of writes is 1 for about 20 minutes on the inner circumference, and the number of writes is 0 for 20 minutes and thereafter, and the number of overwrites is also different.

The detailed operation of the above optical disk device will be described with reference to the drawings by taking a CD-R / RW as an example. FIG. 9 is a system block diagram of the optical disk device. Figure 9
As shown in, the (optical disk) device 2 is connected to a host (computer) 1 such as a PC, and data is exchanged between the host 1 and the device 2 via an ATAPI interface.

The disk structure when recorded by the apparatus, the disk structure when it is erased, and the number of times of recording on the entire surface of the medium will be described. When a recording command is issued from the host 1 to the device 2, the device 2 writes to the optical disc 3. At this time, Disc at Once (LI, DATA, L
When a small amount (not the full capacity of the optical disk) of data is written in a CD writing format in which O is written without interruption, the disk configuration becomes as shown in FIG.

In the figure, PCA is Power Calibra
This is a trial writing area for obtaining the optimum recording power of the optical disc 3 by the action area. PMA is Progr
This is an area for managing track information in amMemory Area, LI is Lead in, and TOC (Table OF Content) which is the table of contents information of the track.
ts) is recorded. LO is Lead out,
This is an area indicating the recording end position of data. Also, Pre
-Gap is a gap of about 2 seconds located at the beginning of the track, and UserDATA is recorded after that.

FIG. 11 is a table showing the disk structure when the entire surface of the optical disk having the structure shown in FIG. 10 is erased. When the host 1 issues a command to the device 2 to erase the entire surface of the optical disc 3, the device 2 sequentially reads the PC from the inside of the optical disc 3.
A, PMA, LI, DATA, LO, and unrecorded areas are erased. Since PCA to LO are areas where data has already been written, erasing all means overwriting the erase pattern on the data, so the number of recordings is 2
Times. In addition, since the area after LO is an unrecorded area, the number of times of recording (erasing pattern recording) is 1 for erasing from here.
Times.

FIG. 12 is a table showing a disk structure when the optical disk having the structure shown in FIG. 10 is simply erased. Since the simple erasure does not erase the entire surface of the optical disc 3, only the portion related to the disc information is erased. Therefore, PMA, L
I and Pre-gap are erased. Therefore, PMA, L
Only I and Pre-gap are recorded twice, DATA which is not erased is recorded once, and unrecorded portion is recorded zero times.

As described above, when recording and erasing a small amount of data on the rewritable optical disk is repeated,
For example, when rewriting is performed 100 times, as an extreme example, the number of overwrites is 200 in the inner circumference and 1 in the outer circumference.
00 times, or if you continue to use Easy Erase for erasing,
The number of overwrites on the inner circumference may be 100, whereas the number of overwrites on the outer circumference may be 0. In general, a rewritable optical disc has a tendency that the recording quality deteriorates as the number of overwrites increases.

[0011]

Therefore, according to the conventional method of erasing an optical disc, a large amount of data is written on the optical disc which is repeatedly recorded and erased with less data than the maximum capacity of the optical disc. In that case, there is a problem in that there is a difference in recording quality between the inner circumference and the outer circumference because the number of times of recording is different between the inner circumference and the outer circumference.

To solve this problem, Japanese Unexamined Patent Publication No. 7-27227
There is a technique for stabilizing the overwrite characteristic itself of the optical disc as in Japanese Patent No. 2, but no technique for stabilizing the recording quality of the entire optical disc by adjusting the number of recording times.

An object of the present invention is to provide an optical disk device and a method for erasing recorded data of an optical disk, which stabilizes the recording quality of the optical disk by adjusting the number of times of recording on the entire surface of the optical disk.

[0014]

In order to achieve the above object, the invention according to claim 1 is an optical disk device for recording and erasing information on a rewritable optical disk via a host computer, and an already-written optical disk. When erasing, the end of the record data is searched and all the areas after the end of the record data are erased,
The most important feature is an optical disk device in which the number of recordings on the entire surface of the optical disk is adjusted and then the original entire surface is erased.

According to the second aspect of the present invention, only when a command to erase the entire surface is received from the host computer, the end of the recording data is searched, the area after the end of the recording data is erased, and then the entire surface is erased. The optical disk device according to claim 1 is a main feature.

According to the third aspect of the present invention, when the erase command instructed by the host computer is smaller than the maximum speed possessed by the apparatus when the erase command instructed by the host computer is received, the erase speed is changed. The optical disk device according to claim 1, which is set to the maximum speed possessed by the device, is a main feature.

Further, in the invention according to claim 4, when a recording error occurs while erasing the area after the end of the recording data and the erasing process is stopped, re-erase is started from the address where the recording error occurs, The main feature is the optical disk device according to any one of claims 1 to 3, wherein the entire surface is erased after the outer peripheral is erased.

A fifth aspect of the present invention is characterized mainly in the optical disc apparatus according to any one of the first to fourth aspects, in which the unerased portion is detected and erased, and then the entire surface is erased.

According to a sixth aspect of the present invention, in an optical disc recording data erasing method for recording and erasing information on a rewritable optical disc via a host computer, when erasing an already written optical disc, The most important feature of the optical disk recording data erasing method is to search the end of the recording data and erase all the areas after the end of the recording data to match the number of recordings on the entire surface of the optical disc and then perform the original full erasing. To do.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a flowchart of the operation of the optical disc device according to the first embodiment of the present invention. When a disk erasing command is sent from the host 1 to the device 2, first the PMA and TOC in which the management information of the optical disk 3 is recorded.
Then, the end address of the data recorded on the optical disc 3 is checked (S1). The area after the end address of the data is erased to the outermost circumference (S2). After that, the entire operation, which is the original operation, is performed (S3).

FIG. 2 is a table showing a disk configuration when the area after the end address of the data of FIG. 1 is erased to the outermost circumference. In this way, the total number of times of recording is adjusted, and then the entire surface is erased.

FIG. 3 is a flowchart of the operation of the optical disk device according to the second embodiment of the present invention. FIG. 4 is a table showing a disk configuration when the entire surface is erased in FIG. When an erasing command is sent from the host 1 to the device 2, it is first determined whether the entire erasing or the simple erasing is performed (S1). In the case of simple erasing (NO in S1), erasing processing after the end of data is not performed. The following operation is performed only when the entire surface is erased (YES in S1).

The end of the data recorded on the optical disc 3 is checked from the PMA and TOC on which the management information of the optical disc 3 is recorded (S2). The area after the end of the data is erased (S3). Further, the entire surface is erased (S4).

FIG. 5 is a flow chart of the operation of the optical disk device according to the third embodiment of the present invention. Host 1
When a disk erasing command is sent from the device 2 to the apparatus 2, first, it is determined whether the entire erasing or the simple erasing is performed (S1). The following operation is performed only when the entire surface is erased (YES in S1).

The end of the data recorded on the optical disc 3 is checked from the PMA and TOC on which the management information of the optical disc 3 is recorded (S2). It is determined whether the erase speed from the host 1 is the highest (S3). If not the fastest (S
(NO in 3) The erasing speed is set to the highest speed (S4). The area after the end of the data is erased (S5). The entire surface is erased (S6).

FIG. 6 is a flow chart of the operation of the optical disc device according to the fourth embodiment of the present invention. Note that FIG. 6 corresponds to a portion surrounded by a broken line in FIG. When the disk erasing command is sent from the host 1 to the device 2, it is first judged whether the entire erasing or the simple erasing is performed (S1 in FIG. 3). The following operation is performed only when the entire surface is erased (YES in S1 of FIG. 3).

The end of the data recorded on the optical disc 3 is checked from the PMA and TOC on which the management information of the optical disc 3 is recorded (S2 in FIG. 3). Erase speed 2
Set to the maximum speed of. Then, the area after the end of the data is erased (S1). It is determined whether the erasing is completed up to the outermost circumference (S2). If it is not completed (NO in S2), the error such as the track deviation is continuously monitored during the erasing (S3). If an error occurs (YES in S3), the address where the error occurred is stored in the memory or the like (S4). Then, erasing is started from the address stored in the memory (S
5). When the outermost circumference is reached, the erasing ends (Y in S2
S). After that, the entire surface is erased (S6).

FIG. 7 is a table showing a configuration example of an optical disc of an open session. A session consists of LI, program area (DATA), and LO. A state in which LI and LO are not recorded so that tracks can be additionally recorded in the same session is called an open session. In the state of FIG. 7, the second session is LI, LO
Since it is not recorded, it is possible to add tracks.

In the case of the optical disc 3 having the structure shown in FIG.
Since LI and LO of the second session are unrecorded, if the data is erased as it is, the recording section and the areas before and after (LI, L
O) causes a difference in the number of recordings.

FIG. 8 is a flow chart of the operation of the optical disk device according to the fifth embodiment of the present invention. FIG. 8 corresponds to the portion surrounded by the broken line in FIG. Host 1 to device 2
When the disk erasing command is received, first, it is determined whether the entire erasing or the simple erasing is performed (S1 in FIG. 5). In case of full erase (Fig. 5
The following operation is performed only in S1 of YES).

The end of the data recorded on the optical disk 3 is checked from the PMA and TOC on which the management information of the optical disk 3 is recorded (S1). At this time, the PMA is read to check whether the optical disc 3 is the optical disc 3 of the open session (S2).

If it is determined that the optical disc 3 is the open session (YES in S2), the L of the final session is set.
I and LO are erased (S3). Set the erase speed to the highest speed the device has. Continues to monitor for errors such as track loss during erasing. If an error occurs, the address at which the error occurred is stored in a memory or the like, and the address stored in the memory is erased again. When the outermost circumference is reached, the erasing ends. Finally, the entire area is erased.

[0033]

According to the first aspect of the present invention, when erasing an already written optical disc, the end of the recording data is searched and the entire area after the end of the recording data is erased. By matching the number of recordings on the entire surface and then performing the original entire erasing, there is no difference in recording quality between the inner circumference and the outer circumference depending on the number of recordings, and it is possible to provide an optical disk having uniform recording quality on the entire surface.

According to the second aspect of the present invention, only when the command for erasing the entire surface is received from the host computer, the end of the recording data is searched, the area after the end of the recording data is erased, and then the entire surface is erased. By doing so, it is possible to maintain the reduction of the erasing time, which is the original purpose of the simple erasing.

According to the third aspect of the invention, when the erasing speed commanded by the host computer is smaller than the maximum speed possessed by the apparatus when the host computer issues a command for erasing the entire surface, the erasing speed is set. By setting the maximum speed possessed by the device, even if it is necessary to erase the entire area twice as much, unnecessary erasing time will not be required and therefore the work efficiency of the PC can be improved. .

According to the fourth aspect of the present invention, when a recording error occurs while erasing the area after the end of the recording data and the erasing process is stopped, re-erase is started from the address where the recording error occurs, By erasing the entire surface after erasing to the outer periphery, it is possible to provide an optical disc having uniform recording quality on the entire surface without causing a difference in the number of recording times between the inner periphery and the outer periphery.

According to the fifth aspect of the present invention, an unrecorded portion is detected and erased, and then the entire surface is erased, thereby providing an optical disk having a uniform recording quality on the entire surface without causing a difference in the number of recording times. be able to.

According to the sixth aspect of the invention, when erasing an already-written optical disc, the end of the recording data is searched, and all the areas after the end of the recording data are erased, so that the entire surface of the optical disc is erased. Match the number of recordings,
Then, by performing the original entire surface erasing, there is no difference in recording quality between the inner circumference and the outer circumference depending on the number of times of recording, and it is possible to provide a method of erasing recorded data of an optical disk having uniform recording quality on the entire surface.

[Brief description of drawings]

FIG. 1 is a flowchart of an operation of an optical disc device according to a first embodiment of the present invention.

FIG. 2 is a table showing a disk configuration when the area after the end address of the data of FIG. 1 is erased to the outermost circumference.

FIG. 3 is a flowchart of an operation of the optical disc device according to the second embodiment of the present invention.

FIG. 4 is a table showing a disk configuration when the entire surface is erased in FIG.

FIG. 5 is a flowchart of the operation of the optical disc device according to the third embodiment of the present invention.

FIG. 6 is a flowchart of the operation of the optical disc device according to the fourth embodiment of the present invention.

FIG. 7 is a table showing a configuration example of an optical disc of an open session.

FIG. 8 is a flowchart of the operation of the optical disc device according to the fifth embodiment of the present invention.

FIG. 9 is a system block diagram of an optical disc device.

FIG. 10 is a chart showing a disc configuration when recording is performed by disc-at-once.

11 is a chart showing a disk configuration when the entire surface of the optical disk having the configuration of FIG. 10 is erased.

12 is a table showing a disc configuration when the optical disc having the configuration of FIG. 10 is simply erased.

[Explanation of symbols]

1 host (computer) 2 devices (optical disk device) 3 optical disks

Claims (6)

[Claims] 1. In an optical disc apparatus for recording and erasing information on a rewritable optical disc via a host computer, when erasing an already written optical disc, the end of the recording data is searched and the end of the recording data is recorded. An optical disk device characterized in that the number of recordings on the entire surface of the optical disk is adjusted by erasing all the subsequent areas, and then the original entire surface is erased. 2. Only when a command for erasing the entire surface is received from the host computer, the end of the recorded data is searched, the area after the end of the recorded data is erased, and then the entire surface is erased. Item 1. The optical disk device according to item 1. 3. When the erasing speed commanded by the host computer is smaller than the maximum speed possessed by the device when the command for erasing the entire surface is received from the host computer,
3. The optical disk device according to claim 1, wherein the erasing speed is set to a maximum speed possessed by the device. 4. When a recording error occurs while erasing an area after the end of the recording data and the erasing process is stopped, re-erase is started from the address where the recording error occurs, and after the erasing to the outer periphery is completed, the entire surface is completed. 4. The optical disk device according to claim 1, wherein the optical disk device is erased. 5. The optical disk device according to claim 1, wherein the entire surface is erased after the unrecorded portion is detected and erased. 6. In a method for erasing recorded data of an optical disc for recording and erasing information on a re-writable optical disc via a host computer, when erasing an already written optical disc, the end of the recorded data is searched, A method for erasing recorded data on an optical disk, wherein the number of recordings on the entire surface of the optical disk is matched by erasing all areas after the end of the recorded data, and then the original entire surface is erased.