JP2003272290A - Optical disk recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent secret information from being leaked by making the reproduction of the information recorded on an optical disk capable of re-recording information impossible. <P>SOLUTION: When a controller 9 receives a request for erasing information in a recording area on the CD-E1 specified by a user from a host computer, the controller 9 erases information in the specified area. Moreover, when the boundary of the specified area does not coincide with the boundary of a packet of the recording unit of the information, the controller inhibits the erasing operation and reports an error to the host computer. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording apparatus for irradiating a rewritable optical disk such as a CD-E with a laser beam to record, erase and overwrite information.

[0002]

2. Description of the Related Art A compact disc dedicated to reproducing information (referred to as "CD"), a compact disc capable of additionally recording information (referred to as "CD-R"), and a compact disc capable of rerecording information ("CD-E"). Information) is formed by a signal called a pit on an optical disc such as
The content of the information is represented by the presence or absence of the pit and the length.

Conventionally, an optical disk recording apparatus having means for setting a delete flag on arbitrary information recorded on a CD-R and prohibiting reproduction of the information set with the delete flag (for example, Japanese Patent Laid-Open No. 7-78341). (See the gazette). On the other hand, the CD-E is a medium capable of recording, reproducing, erasing, and overwriting information, and using the CD-E,
An optical disk recording device is widely used that records, erases, and overwrites pits on the recording surface of the CD-E by changing the power of the laser beam with which the CD-E is irradiated. ing.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the optical disc recording apparatus using E, a delete flag is set to arbitrary information recorded on the optical disc like the above-mentioned conventional optical disc recording apparatus using the CD-R, and the information having the delete flag set is reproduced. Even if the prohibition is prohibited, the delete flag recorded on the CD-E can be easily erased, so that the information can be easily reproduced and the confidential information cannot be prevented from being leaked. . The present invention has been made in view of the above points, and an object of the present invention is to prevent confidential information from leaking by making information recorded on an optical disc in which information can be rerecorded unplayable.

[0005]

In order to achieve the above object, the present invention provides an optical disk recording apparatus for irradiating a rewritable optical disk with a laser beam to record, erase or overwrite information by a user. When the request to erase the information of the designated area is received, the intermediate recording area, the first lead-in area, and the pre-gap area of the first track on the optical disc are erased to remove the table of contents information of all tracks and the incomplete tracks. It is provided with a means for preventing the reference. Further, the optical disc has the intermediate recording area, the first lead-in area, and the first track pre-gap area from the inner circumference side, and the intermediate recording area, the first lead-in area, and the first track. The erasing may be performed in the order of the pre-gap region.

Further, in an optical disc recording apparatus for irradiating a rewritable optical disc with a laser beam to record, erase, and overwrite information, when a request for erasing information in an area designated by the user is received, the user Also provided is a means provided with means for erasing the table of contents information indicating the presence or absence of the track without erasing the track itself on which the information is recorded. Further, in the optical disc recording apparatus as described above, it is preferable to provide a means for erasing the record information of the track where the information is recorded halfway.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of an optical disc recording apparatus according to an embodiment of the present invention. This optical disk recording device is equipped with a spindle motor (hereinafter referred to as "motor") 2 for rotating a re-recordable optical disk (hereinafter referred to as "CD-E") 1 such as a CD-E, and a semiconductor laser. An optical pickup 3 for irradiating the recording area of -E1 with the laser light L, and a coarse movement motor 4 for moving the optical pickup 3 in the radial direction of the CD-E1 in cooperation with a seek motor provided therein. ing.

A rotation control system 5 for controlling the rotation of the motor 2, a coarse movement motor control system 6 for controlling the drive of the coarse movement motor 4, a pickup control system 7 for controlling the optical pickup 3, and an optical pickup. 3, the signal processing system 8 for transmitting and receiving the information signal read by the CD-E1 and the information signal to be written in the recording area of the CD-E1, and the control of the control systems 5 to 7 and the signal processing system 8 and the process according to the present invention. The controller 9 is provided. Further, the controller 9 is connected to the host computer via the external interface 10, and also performs a process of sending the information read from the CD-E1 to the host computer and receiving the information to be written in the CD-E1 from the host computer.

Then, while rotating the CD-E1 by the motor 2, the optical pickup 3 is moved in the radial direction of the CD-E1, and the laser light L from the semiconductor laser of the optical pickup 3 is recorded on the recording surface of the CD-E1. Information is recorded, erased, overwritten, and reproduced by irradiating the area. Furthermore, this optical disk recording apparatus is also capable of reproducing a reproduction-only CD and recording and reproducing on a recordable CD-R.

When recording information under the control of the controller 9, this optical disk recording apparatus irradiates the recording area of the CD-E1 with the laser light L from the optical pickup 3 at a recording power to record various information on the CD-E1. . Further, when the information is reproduced under the control of the controller 9, the CD-
The recording area E1 is irradiated with the laser light L from the optical pickup 3 with reproduction power, and the information recorded in the recording area is reproduced based on the reflected light. Then, in this optical disc recording apparatus, a process of making the reading of information on the CD-E 1 according to the present invention impossible is performed by the control of the controller 9.

FIG. 2 is a diagram showing an example of the format of the recording area of the CD-E1 used in the optical disc recording apparatus shown in FIG. The recording area of the CD-E1 is the power calibration area (PCA) from the inner circumference side of the disc.
21, intermediate recording area (program memory area, "PM
22), a lead-in area 23, a plurality of tracks 24, and a lead-out area 25.

The PCA 21 is an area for obtaining the optimum laser power when recording information by trial-writing (test recording) predetermined information and adjusting the laser power.
The PMA 22 is an area for recording the table of contents information of the track 24 for temporarily holding it. Lead-in area 23
Is an area having various information about the medium of this CD-E1 such as table of contents information (TOC) such as the start address and end address of the track 24.

The track 24 is an area for recording user information for recording, reproducing and using on the CD-E1. Each track 24 is composed of a pre-gap 26 for recording information of the track itself and a user data area 27 for recording user information. The lead-out area 25 is an area for recording information indicating the end of the session. The format of the CD-E shown in FIG. 2 is defined by "Orange Book Part 2, Version 2.0" and the like, and is known, so a detailed description thereof will be omitted.

The optical disk recording apparatus according to the present invention will be described below in order with the above optical disk recording apparatus. (1) Optical disc recording apparatus for carrying out the present invention The controller 9 irradiates the CD-E1 with a laser beam to record, erase, and overwrite information, and at the same time, C
It fulfills the function of a means for erasing the information recorded in the designated area on D-E1. FIG. 3 is a flow chart showing the information erasing process of the CD-E1 in the optical disc recording apparatus embodying the present invention. In this process, when a request to erase the information in the area designated by the user is received in step 1 (indicated by "S" in the figure), the process proceeds to step 2 to erase the information in the designated area, and the process ends. To do.
In this way, the optical disk recording apparatus embodying the present invention actually erases the information in the designated area on the CD-E1, and therefore the information recorded on the CD-E1 cannot be completely reproduced. It is possible to prevent leakage of unnecessary confidential information recorded on the CD-E1.

(2) Although pits can be erased and overwritten (information can be erased and overwritten) in another optical disk recording apparatus CD-E for carrying out the present invention, pit erasing is recording of media rather than recording and overwriting. It is not recommended so much because surface deterioration is severe. Methods of erasing information on the CD-E include a physical erasing method by erasing pits and a logical erasing method of overwriting predetermined pattern data to logically erase information.
Since this logical erasing method is physically overwriting, deterioration of the recording surface of the medium is less than that of the physical erasing method, and is an effective means for erasing information. Therefore, in another optical disk recording apparatus embodying the present invention, desired information of the CD-E1 is overwritten with predetermined data to erase the information. Therefore, in another optical disk recording apparatus embodying the present invention, the controller 9 irradiates the CD-E1 with a laser beam to record, erase, and overwrite information, and at the same time, a designated area on the CD-E1 is designated. When erasing the information recorded in the area, it fulfills the function of a means for overwriting the area with predetermined pattern data.

FIG. 4 is a flowchart showing the information erasing process of the CD-E1 in another optical disk recording apparatus embodying the present invention. In this process, when a request to erase the information in the area designated by the user is received in step (indicated by "S" in the figure) 11, the process proceeds to step 12 and the designated area is overwritten with predetermined pattern data to designate the area. The information in the area is erased, and this processing ends. In this way, according to another optical disk recording apparatus embodying the present invention, when erasing the information of the designated area on the CD-E1, the area is overwritten with the predetermined pattern data and erased. Therefore, the information recorded on the CD-E1 can be made completely unreproducible, and leakage of unnecessary confidential information recorded on the CD-E1 can be prevented. Furthermore, it is not necessary to erase information by physically erasing the pits formed on the CD-E1.
It is possible to prevent deterioration of the recording surface due to physical erasing of information on D-E1.

(3) A minimum unit of information to be recorded / reproduced on another optical disk recording apparatus CD for carrying out the present invention is called a sector, and the sector is a main channel for recording user information which is actual information, A subchannel for recording the address and attribute of the sector is configured. The main channel is an area for recording user information, and since all pattern data is recorded, it is difficult to determine predetermined pattern data to be overwritten to erase information. On the other hand, the sub-channel is an area whose recorded content is defined by the regulations such as "Orange Book Part 2 Version 2.0", and facilitates the new pattern data which is not used in normal CDs or CD-Rs. Can be defined as Therefore, in another optical disk recording apparatus embodying the present invention, predetermined pattern data is newly defined in the sub-channel of the CD-E1, and the pattern data is overwritten to erase the information. Therefore, in still another optical disk recording apparatus embodying the present invention, the controller 9 is
When the D-E1 is irradiated with a laser beam to record, erase, or overwrite information, and when the information recorded in a designated area on the CD-E1 is erased, a subchannel in the area is recorded. It functions as a means for overwriting a predetermined pattern data in the area.

FIG. 5 is a diagram showing an example of the format of the sub-channel in the sector of the minimum unit of information of CD-E1. The sub-channel 31 is composed of eight sub-codes from sub-code P to sub-coat W, and the sub-code Q of the sub-code Q area 32 in the sub-code is data indicating the address and attribute of the user information. is there.
ADR of the ADR (area) 33 in the subcode Q
The byte is ADR = 0 in the standard of normal CD and CD-R.
Is not specified. Therefore, the predetermined pattern data to be overwritten to erase the user information is defined as ADR = 0.

FIG. 6 is a flowchart showing information erasing processing of an optical disc in another optical disc recording apparatus embodying the present invention. In this process, when a request for erasing the information in the area designated by the user is received in step (indicated by "S" in the figure) 21, the process proceeds to step 22 and the subchannel in the designated area is defined by the subchannel. Overwrite the specified pattern data (ADR = 0),
The information of the sub-channel in the designated area is erased, and this processing ends. Also, because of the characteristics of recording information on an optical disc including a CD-E, it is not possible to leave the main channel and overwrite only the sub-channel. Therefore, by overwriting the user information of the main channel as well, as a result, the main channel The user information will also be erased.

The pattern data to be overwritten on the main channel does not have to be specified in particular, and the pattern data of all "0" may be overwritten. Thus, according to another optical disk recording apparatus embodying the present invention, a CD-
When erasing the information in the designated area on E1, the sub-channel indicating the address or attribute of the area is overwritten with the predetermined pattern data and erased. Since the user information of is also erased, the information recorded on the CD-E1 can be made unreproducible, and the leakage of unnecessary confidential information recorded on the CD-E1 can be prevented. .
Further, pattern data for overwriting the sub-channel is used in a conventional optical disk recording device such as a CD or CD-R.
Can be easily defined as new pattern data that will not be used in the sub-channel, and even if the CD-E1 in which the pattern data is recorded in the sub-channel is used in the conventional optical disk recording device, there is a bad influence such as erroneous reproduction. It is possible to maintain compatibility with the conventional optical disk recording device.

(4) In still another optical disk recording apparatus CD-E embodying the present invention, information can be additionally written in the blank area in the same manner as the CD-R. However, when information is logically erased by overwriting predetermined pattern data in the area designated by the user as in the above optical disk recording apparatus, some pattern data is actually recorded in the overwritten area. However, since it is different from the blank area in which nothing is written, it is treated as a recorded area and it becomes impossible to additionally write to that area.

That is, C is placed in the logically erased area of the CD-E.
In order to record information in the same manner as DR, it is necessary to treat the area in the same manner as the physically erased area, and the logically erased area is the same as the physically erased area. It must be treated as a new recordable area with no information. Therefore, in still another optical disk recording apparatus embodying the present invention, the area on the CD-E1 in which the predetermined pattern data is overwritten is treated in the same manner as a newly recordable area. Therefore, in still another optical disk recording apparatus embodying the present invention, the controller 9 also functions as a unit for treating the area overwritten with the predetermined pattern data as an area where information is not recorded.

FIG. 7 is a flow chart showing an optical disc information erasing process in still another optical disc recording apparatus embodying the present invention. In this process, when a request for erasing information in the area designated by the user is received in step (indicated by "S" in the figure) 31, the process proceeds to step 32 and the designated area is overwritten with predetermined pattern data and designated. The information in the area is erased, the process proceeds to step 33, and the recognition processing is performed in which the area overwritten with the pattern data is treated as a blank area, and this processing ends.
In this way, the area overwritten with the pattern data for erasing the information is treated as a blank area after the erasing of the information, so that the information can be easily re-written in the same manner as the normal information-writing to the CD-R. Therefore, the recording area of the medium can be effectively used. Thus, according to still another optical disk recording apparatus embodying the present invention, the area where the predetermined pattern data on the CD-E1 is overwritten and logically erased is made equivalent to the area where information is not recorded and physically erased. By handling it, it is possible to easily recognize the area as a blank area in which information is not recorded and rewrite the information again.

(5) The recording areas of still another optical disk recording apparatus CD-E (including CD, CD-R, etc.) for carrying out the present invention are classified into various areas, as shown in FIG. , A track 24 in which user information is recorded, a lead-in area 23 having various information about the medium including table of contents information (TOC) such as a start address and an end address of the track 24,
Intermediate recording area (PMA) for recording the contents of the lead-out area 25 and track 24 temporarily
There are 22. Since the recording formats of these areas are different from each other, it is necessary to make different the pattern data to be overwritten when logically erasing. Therefore, if the user performs a designation operation when logically erasing each area of the recording area as in the above-described optical disk recording apparatus, the work load on the user is increased and the operability is not good.

Further, if the user can easily erase an arbitrary area by designating, the information on the CD-E medium cannot be kept consistent, and a nonstandard illegal medium is created. The CD-E may become unusable. Therefore, when erasing the information on the CD-E medium, it is necessary to limit the variation of erasing and to erase the information on the medium so as to maintain the consistency. In still another optical disk recording apparatus embodying the present invention, the entire surface of the CD-E1 is erased.
This full erasure is a process of completely erasing a used CD-E1 and returning it to a new medium on which no information is recorded. Therefore, in still another optical disk recording apparatus embodying the present invention, the controller 9
However, the CD-E1 is irradiated with a laser beam to record, erase, and overwrite information, and at the same time, functions as a unit for erasing the entire recording area on the CD-E1.

FIG. 8 is a flow chart showing a blank erasing process of an optical disc in still another optical disc recording apparatus embodying the present invention. In this process, when a request for erasing the entire surface of information in the area designated by the user is received in step (indicated by "S" in the figure) 41, step 42
Proceed to to erase PMA information, proceed to step 43 to erase lead-in area information, proceed to step 44 to erase information of all tracks, proceed to step 45 to erase lead-out area information. Then, this process ends. In this way, by erasing the information on the entire surface of the CD-E1 medium and treating it like a new medium, the CD
-E1 can be reused. This is an erasure to re-use the media from the beginning like the reformatting of a floppy disk.

In the erasing process described above, the order of erasing the PMA, lead-in area, track, and lead-out area information is not limited to the above order, and as a result, the CD-E recording area is erased. The information may be erased in any order as long as the information in all areas is erased. In this way, still another optical disk recording apparatus embodying the present invention erases the entire recording area on the CD-E1 so that it can be treated as a new medium,
The information recorded on the E1 can be made completely unreproducible, and leakage of unnecessary confidential information recorded on the CD-E1 can be prevented. Furthermore, the CD-E1 after the entire recording area is erased can be reformatted and easily reused.

(6) Optical Disk Recording Apparatus According to Claims 1 to 4 of the Present Invention When the entire surface of the CD-E1 medium is erased as in the case of another optical disk apparatus for carrying out the present invention, the erase execution time is extremely long. It will be long. For example, the information recording speed is 74
It takes a little less than 40 minutes to erase the minute media. Therefore, in order to use it as a new medium in a short time, the minimum necessary information for making the information on the CD-E1 unreproducible may be erased. That is, the track itself on which the user information is recorded on the CD-E1 is not erased, but the table-of-contents information indicating the presence or absence of the track is erased so that there is no track.

As the area having the table of contents information of the track on the medium of the CD-E1, as shown in FIG.
22 and a lead-in area 23. By erasing these areas, it is possible to prevent the track 24 from existing on the medium. In addition, multiple lead-in areas can exist on the media and are numbered from the inside of the media, but each lead-in area can be specified from the lead-in area immediately before (inner) the media. Therefore, it is possible to eliminate the lead-in area on the medium at all by erasing the lead-in area of the first re-inner circumference on the medium. Furthermore, there is an incomplete track as the only track in which the table of contents information is not recorded in the PMA and the lead-in area. This incomplete track is a track in which information has been recorded halfway, and the recording information of the incomplete track is not recorded in the PMA or lead-in area but is recorded in the pregap existing at the head of the incomplete track itself. .

At most one incomplete track can exist on the medium, and no other track exists after the incomplete track. Therefore, in the optical disk recording apparatus according to the first to fourth aspects of the present invention, by deleting the minimum necessary information from the CD-E1, it becomes impossible to reproduce the information recorded on the CD-E1 and the information is recorded for a short time. To make a new media. Therefore,
In the optical disc recording apparatus according to claims 1 to 4 of the present invention,
The controller 9 irradiates the CD-E1 with a laser beam to record, erase, and overwrite information, and at the same time, C
It functions as a means for erasing the PMA on D-E1, the first lead-in area, and the pre-gap area of the first track.

FIG. 9 is a flowchart showing the entire surface erasing process of the optical disc in the optical disc recording apparatus according to the first to fourth aspects of the present invention. In this process, when a request to completely erase the information in the area designated by the user is received in step (indicated by "S" in the figure) 51, the process proceeds to step 52 to erase the PMA information, and proceeds to step 53 to execute the media operation. The information of the first lead-in area (first lead-in area) above is erased, and the process proceeds to step 54 to erase the information of the pre-gap of the first track, and this processing is ended. Thus, the PMA 22, the first lead-in area 23, and the pre-gap 26 of the first track 24 on the CD-E 1 are
By erasing the information of No. 2, the table of contents information of all tracks 24 and the incomplete tracks cannot be referred to, and reproduction cannot be performed.

Further, even if the substance of the information on the track 24 is left, the medium can be artificially made like a new one, and the information can be recorded and reused. Furthermore, the erasing time can be shortened as much as the substance of the information on the track 24 is not erased. For example, assuming that the total length of the PMA 22, the first lead-in area 23, and the first pre-gap 26 is about 2 to 3 minutes, if the information in those areas is erased at double speed, the erase time will be 1 to 2 minutes. . In the erasing process described above, the order of erasing the information of the PMA, the first lead-in area, and the pre-gap of the first track is not limited to the above order, and as a result, the information in those areas is erased. If it is performed, it may be deleted in any order.

Thus, according to the optical disk recording apparatus of the first to fourth aspects of the present invention, the PM on the CD-E1 is
A22, the first lead-in area 23, and the area of the pregap 26 of the first track 24 are erased to erase the contents of the track and the presence of the incomplete track, so that the information recorded on the CD-E1 is erased. It can be made unreproducible, and leakage of unnecessary confidential information recorded on the CD-E1 can be prevented. In addition, CD-
By deleting the minimum necessary area for making the information on E1 unreproducible, the processing time can be greatly shortened.

(7) The unit of information recording of the optical disk recording apparatus CD-E (also CD-R) which implements the present invention or is another is a packet. FIG. 10 is a diagram showing an example of a packet format which is a recording unit of the CD-E1 used in the optical disc recording apparatus shown in FIG. Each packet 41 starts with a link block 42 and a plurality of run-in blocks 43 (here, four), and ends with a plurality of run-out blocks 45 (here, two), and user data between the run-in block 43 and the run-out block 45. Block 44 is allocated.

Information cannot be recorded or erased on the CD-E 1 in packet units, and the information cannot be recorded or erased at any position in the packet 41. Then, if a region that starts from a part that is not the boundary of the packet 41 or ends in a part that is not the boundary is recorded or erased, the format consistency on the medium is lost and the medium becomes an illegal medium. In other words, if the format on the medium is ignored and arbitrary information is erased or overwritten, the medium cannot be used.

Therefore, another optical disk recording apparatus embodying the present invention enables only the recording and erasing of information from the boundary of the packet, and prohibits the recording and erasing of the other designated area and the CD. -Preventing E1 from becoming illegal media. Therefore, in another optical disk recording apparatus embodying the present invention, the controller 9 prohibits the erasing operation and causes an error when the boundary of the designated area does not match the boundary of the packet 41 of the information recording unit. Acts as a means of reporting.

FIG. 11 is a flowchart showing the information erasing process of the optical disc in the optical disc recording apparatus embodying the present invention or another one. In this process, when a request to erase information in the area designated by the user is received in step (indicated by “S” in the figure) 61, step 62
Then, it is judged whether the boundary of the designated area coincides with the boundary of the packet which is the recording unit on the medium. If they coincide with each other, the routine proceeds to step 63, where the information in the designated area is erased and coincides. If not, the process proceeds to step 64, prohibits the operation of erasing the information in the designated area, reports an error, and terminates this processing. The error report may be sent to the host computer, which may display it on the display to alert the user.

Thus, according to another embodiment of the optical disk recording apparatus for carrying out the present invention, the CD-E1
When the boundary of the above designated area does not match the boundary of the packet 41 of the information recording unit, the erasing operation is prohibited and an error is reported, and the boundary of the area to be erased matches the boundary of the packet 41. The information recording unit packet 4 on the CD-E1 is executed by executing the information erasing operation only on the
It is possible to keep the format of the recording area consistent and prevent the medium from becoming an unauthorized medium without breaking 1.

In the above embodiment, the optical disc 1 is used.
Although the case where the CD-E is used is explained as above, the present invention can be applied to all other rewritable media capable of additionally recording data. The optical disc recording apparatus according to the embodiment of the present invention makes full use of the characteristics of rewritable media such as CD-E that information can be recorded, erased, and overwritten, and the unnecessary information recorded on the medium is eliminated. Can be reliably prevented from playing.

[0040]

As described above, according to the optical disk recording apparatus of the present invention, it is possible to prevent the leakage of confidential information by making the information recorded on the re-recordable optical disk unreproducible. .

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an optical disc recording apparatus according to an embodiment of the present invention.

2 is a diagram showing an example of a format of a recording area of a re-recordable optical disc used in the optical disc recording apparatus shown in FIG.

FIG. 3 is a flowchart showing an information erasing process of an optical disc in the optical disc recording apparatus embodying the present invention.

FIG. 4 is a flowchart showing an information erasing process of an optical disc in another optical disc recording apparatus embodying the present invention.

FIG. 5 is a diagram showing an example of a format of a sub-channel in a sector of a minimum unit of information of an optical disc used in another optical disc recording apparatus embodying the present invention.

FIG. 6 is a flowchart showing information erasing processing of an optical disc in another optical disc recording apparatus embodying the present invention.

FIG. 7 is a flowchart showing an optical disc information erasing process in still another optical disc recording apparatus embodying the present invention.

FIG. 8 is a flow chart showing an entire optical disc erasing process in still another optical disc recording apparatus embodying the present invention.

FIG. 9 is a flow chart showing the entire surface erasing process of the optical disc in the optical disc recording apparatus according to the first to fourth aspects of the present invention.

10 is a diagram showing an example of a format of a packet which is a recording unit of a re-recordable optical disc used in the optical disc recording device shown in FIG.

FIG. 11 is a flowchart showing an information erasing process of an optical disc in an optical disc recording apparatus embodying the present invention or another one.

[Explanation of symbols]

1: Optical disk 2: Motor 3: Optical pickup 4: Coarse motor 5: Rotation control system 6: Coarse motor control system 7: Pickup control system 8: Signal processing system 9: Controller 10: External interface 21: Power calibration area (PCA) 22: Intermediate recording area (PMA) 23: Lead-in area 24: Track 25: Lead-out area 26: Pre-gap 27: User data area 31: Sub-channel 32: Sub-code Q area 33: ADR 41: Packet 42: Link block 43: Run-in block 44: User data block 45: Runout block

Claims (4)

[Claims] 1. An optical disc recording apparatus for irradiating a rewritable optical disc with a laser beam to record, erase, and overwrite information, when a request for erasing information in an area designated by a user is received, An optical disk comprising means for erasing the intermediate recording area, the first lead-in area, and the pre-gap area of the first track on the optical disk so that the index information of all tracks and incomplete tracks cannot be referred to. Recording device. 2. The optical disc has the intermediate recording area, the first lead-in area, and the first track pre-gap area from the inner circumference side, and the intermediate recording area,
The optical disc recording apparatus according to claim 1, wherein the erasing is performed in the order of the first lead-in area and the first track pre-gap area. 3. An optical disc recording apparatus for irradiating a rewritable optical disc with a laser beam to record, erase, and overwrite information, when a user requests to erase information in an area designated by the user. An optical disk recording apparatus comprising means for erasing the index information indicating the presence or absence of the track without erasing the track itself on which the information is recorded. 4. The optical disk recording apparatus according to claim 3, further comprising means for erasing recorded information of a track on which information has been recorded halfway.