JP3816455B2 - Optical disk recording device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to an optical disc recording apparatus that records, erases, and overwrites information by irradiating a laser beam onto a re-recordable optical disc such as a CD-E.
[0002]
[Prior art]
  Compact disc dedicated to reproducing information (referred to as “CD”), compact disc capable of additionally recording information (referred to as “CD-R”), compact disc capable of re-recording information (referred to as “CD-E”), etc. Information is formed on the optical disk by signals called pits, and the contents of the information are represented by the presence or absence and length of the pits.
[0003]
  2. Description of the Related Art Conventionally, an optical disc recording apparatus provided with means for setting a delete flag for arbitrary information recorded on a CD-R and prohibiting reproduction of information with the delete flag set (see, for example, Japanese Patent Laid-Open No. 7-78341) was there.
  On the other hand, CD-E is a medium on which information can be recorded, reproduced, erased, and overwritten. The CD-E is used on the CD-E by changing the power of laser light applied to the CD-E. In many cases, an optical disk recording apparatus that records, erases, and overwrites pits on the recording surface and enables information to be recorded, erased, and overwritten.
[0004]
[Problems to be solved by the invention]
  However, in an optical disc recording apparatus using CD-E, a delete flag is set for arbitrary information recorded on the optical disc as in the conventional optical disc recording apparatus using CD-R, and the delete flag is set. Even if the reproduction of the recorded information is prohibited, the delete flag recorded on the CD-E can be easily deleted, so that the information can be easily reproduced, and the leakage of confidential information cannot be prevented. There was a problem.
  The present invention has been made in view of the above points, and an object of the present invention is to prevent information recorded on an rewritable optical disc from being reproduced, thereby preventing leakage of confidential information.
[0005]
[Means for Solving the Problems]
  In order to achieve the above object, an optical disc recording apparatus for recording, erasing, and overwriting information by irradiating a re-recordable optical disc with a laser beam is an information erasing request for an area specified by a user. When receiving the intermediate recording area on the optical disc, MostFirst lead-in area, And the pre-gap area of the first trackTo delete all track contents informationAnd imperfect trackIs provided to prevent reference to.
[0006]
  Further, the optical disc has the intermediate recording area, the first lead-in area, and the first track pre-gap area from the inner periphery 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 pregap regions.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
  FIG. 1 is a diagram showing a schematic configuration of an optical disk recording apparatus according to an embodiment of the present invention.
  This optical disk recording apparatus is equipped with a spindle motor (hereinafter referred to as “motor”) 2 that rotates a re-recordable optical disk (hereinafter referred to as “CD-E”) 1 such as CD-E, and a semiconductor laser. -An optical pickup 3 for irradiating the recording area of E1 with laser light L, and a coarse motion 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.
[0008]
  Further, the rotation control system 5 that controls the rotation of the motor 2, the coarse motion motor control system 6 that controls the drive of the coarse motion motor 4, the pickup control system 7 that controls the optical pickup 3, and the optical pickup 3 read. A signal processing system 8 for transmitting and receiving information signals and information signals to be written in the recording area of the CD-E1, and a controller 9 for performing processing according to the present invention together with the control of the control systems 5 to 7 and the signal processing system 8. I have.
  Further, the controller 9 is connected to the host computer via the external interface 10, and performs processing for sending information read from the CD-E1 to the host computer and receiving information to be written to the CD-E1 from the host computer.
[0009]
  Then, the optical pickup 3 is moved in the radial direction of the CD-E1 while the CD-E1 is rotated by the motor 2, and the laser beam L is irradiated from the semiconductor laser of the optical pickup 3 onto the recording area of the CD-E1. Information is recorded, erased, overwritten, and reproduced.
  Further, this optical disk recording apparatus can reproduce a reproduction-only CD, and record and reproduce on a recordable CD-R.
[0010]
  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 with the recording power, and records various information on the CD-E1.
  Further, when information is reproduced under the control of the controller 9, the laser beam L is irradiated from the optical pickup 3 to the recording area of the CD-E1 with reproduction power, and the information recorded in the recording area is reproduced based on the reflected light. To do.
  In this optical disk recording apparatus, processing for making it impossible to read information on the CD-E 1 according to the present invention is performed under the control of the controller 9.
[0011]
  FIG. 2 is a diagram showing an example of the format of the recording area of the CD-E 1 used in the optical disc recording apparatus shown in FIG.
  The recording area of the CD-E 1 includes a power calibration area (PCA) 21, an intermediate recording area (program memory area, referred to as “PMA”) 22, a lead-in area 23, a plurality of tracks 24, A lead-out area 25 is provided.
[0012]
  The PCA 21 is an area for obtaining optimum laser power for recording information by trial writing (test recording) predetermined information to adjust the laser power.
  The PMA 22 is a recording area for temporarily storing the table of contents information of the track 24.
  The lead-in area 23 is an area having various information related to the CD-E1 medium, such as table of contents information (TOC) such as the start address and end address of the track 24.
[0013]
  The track 24 is an area for recording user information to be recorded, reproduced, and used on the CD-E1.
  Each track 24 includes 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” or the like and is well known, and thus detailed description thereof is omitted.
[0014]
  Hereinafter, the optical disc recording apparatus according to the present invention will be described in order by the optical disc recording apparatus.
(1) This inventionFirst reference technologyOptical disc recording device
  The controller 9 irradiates the CD-E1 with laser light to record, erase, and overwrite information, and at the same time functions as means for erasing information recorded in a specified area on the CD-E1. Fulfill.
  FIG. 3 shows the present invention.First reference technology10 is a flowchart showing information erasure processing of CD-E1 in the optical disc recording apparatus of FIG.
  When this process receives a request for deleting information in the area designated by the user in step (indicated by “S” in FIG. 1), the process proceeds to step 2 to erase the information in the designated area and terminate this process. To do.
  In this way, the present inventionFirst reference technologySince the optical disk recording apparatus of FIG. 1 actually erases the information in the designated area on the CD-E1, the information recorded on the CD-E1 can be made completely unreproducible. It is possible to prevent leakage of unnecessary confidential information recorded above.
[0015]
(2) This inventionSecond reference technologyOptical disc recording device
  In CD-E, pits can be erased and overwritten (information erased and overwritten), but erasing of pits is not recommended because the recording surface of the medium is more deteriorated than recording and overwriting.
  Methods for erasing information on the CD-E include a physical erasing method by pit erasing and a logical erasing method in which information is logically erased by overwriting predetermined pattern data.
  Since this logical erasing method is physically overwritten, the recording surface of the medium is less deteriorated than the physical erasing method and is an effective means for erasing information.
  Therefore, this inventionSecond reference technologyIn the optical disc recording apparatus, the desired information on the CD-E1 is overwritten with predetermined data and the information is erased.
  Therefore, this inventionSecond reference technologyIn the optical disc recording apparatus, the controller 9 irradiates the CD-E1 with laser light to record, erase, and overwrite information, and also records information recorded in a designated area on the CD-E1. When erasing, it functions as means for overwriting predetermined pattern data in the area.
[0016]
  FIG. 4 shows the present invention.Second reference technology10 is a flowchart showing information erasure processing of CD-E1 in the optical disc recording apparatus of FIG.
  In this process, when a request to delete the information of the area designated by the user is received in step (indicated by “S” in FIG. 11), the process proceeds to step 12 and the designated area is overwritten with predetermined pattern data. The information in the area is erased, and this process ends.
  In this way, the present inventionSecond reference technologyAccording to the optical disc recording apparatus, when the information in the designated area on the CD-E1 is erased, the predetermined pattern data is overwritten in the area and erased, so 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.
  Further, it is not necessary to erase information by erasing physical pits formed on the CD-E1, and it is possible to prevent deterioration of the recording surface due to physical erasure of information on the CD-E1.
[0017]
(3) This invention3rd reference technologyOptical disc recording device
  The minimum unit of information to be recorded / reproduced on a CD is called a sector, and the sector comprises a main channel for recording user information, which is actual information, and a subchannel for recording the address and attribute of the sector.
  The main channel is an area for recording user information. Since all pattern data is recorded, it is difficult to determine predetermined pattern data to be overwritten in order to erase the information.
  On the other hand, the sub-channel is an area where the recorded content is defined by the regulations such as “Orange Book Part 2 Version 2.0”, and new pattern data that is not used in normal CDs and CD-Rs can be easily obtained. Can be defined.
  Therefore, in another optical disc recording apparatus embodying the present invention, predetermined pattern data is newly defined in the sub-channel of CD-E1, and the information is erased by overwriting the pattern data.
  Therefore, this invention3rd reference technologyIn the optical disk recording apparatus, the controller 9 irradiates the CD-E1 with a laser beam to record, erase, and overwrite information, and information recorded in a designated area on the CD-E1. When erasing data, it functions as means for overwriting predetermined pattern data in the subchannel region in the region.
[0018]
  FIG. 5 is a diagram illustrating an example of a format of a subchannel in a sector of a 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 in the sub-code Q area 32 in the sub-code is data indicating the address, attribute, etc. of user information. is there.
  In the ADR byte of the ADR (area) 33 in the subcode Q, ADR = 0 is not defined according to normal CD and CD-R specifications.
  Therefore, predetermined pattern data to be overwritten for erasing user information is defined as ADR = 0.
[0019]
  FIG. 6 shows the present invention.3rd reference technology5 is a flowchart showing an optical disc information erasing process in the optical disc recording apparatus of FIG.
  In this process, when a request for deleting 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. The predetermined pattern data (ADR = 0) is overwritten, the subchannel information in the designated area is erased, and this process is terminated.
  In addition, because of the characteristics of recording information on an optical disc including a CD-E, it is not possible to overwrite only the sub-channel while leaving the main channel. User information is also deleted.
[0020]
  The pattern data to be overwritten on the main channel does not need to be specified in particular, and all “0” pattern data may be overwritten.
  In this way, the present invention3rd reference technologyAccording to the optical disc recording apparatus, when erasing information on a designated area on the CD-E1, the predetermined pattern data is overwritten and erased on a subchannel indicating the address and attribute of the area, and the disc medium is erased. As a result, the user information of the main channel is also erased from the recording characteristics of the CD-E1, so that the information recorded on the CD-E1 can be made unreproducible, and the information recorded on the CD-E1 becomes unnecessary. It is possible to prevent leakage of confidential information.
  Furthermore, the pattern data to be overwritten on the subchannel can be easily defined as new pattern data that is not used in the CD and CD-R used in the conventional optical disk recording apparatus. Even if the CD-E1 recorded in the above is used in a conventional optical disk recording apparatus, compatibility with the conventional optical disk recording apparatus can be maintained without adverse effects such as erroneous reproduction.
[0021]
(4) This invention4th reference technologyOptical disc recording device
  In CD-E, information can be additionally written in the blank area in the same manner as CD-R.
  However, when information is logically erased by overwriting predetermined pattern data in an area designated by the user as in the optical disc recording apparatus, pattern data is actually recorded in the overwritten area. Since it is different from a blank area where nothing is written, it is treated as a recorded area and cannot be additionally recorded in that area.
[0022]
  That is, in order to add information to the CD-E logically erased area in the same manner as the CD-R, it is necessary to treat the area in the same manner as the physically erased area, and the logically erased area is deleted. As with the physically erased area, it is necessary to treat the area as a new recordable area having no information.
  Therefore, this invention4th reference technologyIn the optical disk recording apparatus, the area over which the predetermined pattern data on the CD-E1 is overwritten is handled in the same manner as the area where new recording is possible.
  Therefore, this invention4th reference technologyIn the optical disk recording apparatus, the controller 9 also functions as means for handling the area where the predetermined pattern data is overwritten in the same manner as the area where information is not recorded.
[0023]
  FIG. 7 shows the present invention.4th reference technology5 is a flowchart showing an optical disc information erasing process in the optical disc recording apparatus of FIG.
  In this process, when a request for deleting information in the area designated by the user is received in step (indicated by “S”) 31, the process proceeds to step 32 to overwrite the designated pattern data in the designated area and designate it. The information in the area is erased, and the process proceeds to step 33 where a recognition process is performed in which the area overwritten with the pattern data is treated as a blank area, and this process ends.
  In this way, the area in which the pattern data is overwritten in order to erase the information is treated as a blank area after the information is erased. Therefore, the information is easily added again in the same manner as the information addition to the normal CD-R. And the recording area of the media can be used effectively.
  In this way, the present invention4th reference technologyAccording to the optical disc recording apparatus of FIG. 1, the area erased by overwriting the predetermined pattern data on the CD-E1 is handled in the same manner as the physically erased area where the information is not recorded, so that the information is stored in the area. It is easy to recognize information as an unrecorded blank area and add information again.
[0024]
(5) This invention5th reference technologyOptical disc recording device
  Recording areas of CD-E (including CD, CD-R, etc.) are classified variously. As shown in FIG. 2, the track 24 for recording user information, the start address and end address of the track 24, etc. In addition to the table of contents information (TOC), there are a lead-in area 23 having various information related to the medium, a lead-out area 25, and an intermediate recording area (PMA) 22 for temporarily storing the table of contents information.
  Since the recording formats of these areas are different from each other, it is necessary to change the pattern data to be overwritten when logically erasing.
  Therefore, if the user performs a designation operation when performing logical erasure for each area of the recording area as in the above-described optical disc recording apparatus, the user's work load increases and the operability is not good.
[0025]
  If an arbitrary area can be easily deleted by user designation, the consistency of information on the CD-E media cannot be maintained, and non-standard illegal media will be created. There is also a risk that E cannot be used.
  Therefore, when erasing information on a CD-E medium, it is necessary to limit erasing variations and to erase the information on the medium so as to maintain consistency.
  This invention5th reference technologyIn this optical disk recording apparatus, the entire surface of the CD-E1 is erased. This full erasure is a process of erasing the used CD-E1 entirely and returning it to a new medium on which no information is recorded.
  Therefore, this invention5th reference technologyIn the optical disk recording apparatus, the controller 9 performs the function of means for irradiating the CD-E1 with laser light to record, erase and overwrite information, and erase the entire recording area on the CD-E1. Fulfill.
[0026]
  FIG. 8 shows the present invention.5th reference technology5 is a flowchart showing the entire optical disc erasing process in the optical disc recording apparatus of FIG.
  In this process, when a request to completely erase the information in the area specified by the user is received in step (indicated by “S” in the figure) 41, the process proceeds to step 42 to erase the PMA information, and proceeds to step 43 to read. The in-area information is erased, the process proceeds to step 44, the information of all tracks is erased, the process proceeds to step 45, the information of the lead-out area is erased, and this process is terminated.
  Thus, the CD-E1 can be reused by erasing the information on the entire surface of the CD-E1 and treating it as if it were a new medium. This is an erasure to re-use the media from the beginning as with the reformatting of the floppy disk.
[0027]
  In the above-described erasing process, the order of erasing the information in the PMA, lead-in area, track, and lead-out area is not limited to the above order, and as a result, the entire recording area of the CD-E is recorded. If information is erased, it may be erased in any order.
  In this way, the present invention5th reference technologyIn the optical disk recording apparatus, the information recorded on the CD-E1 can be made completely unreproducible by erasing the entire recording area on the CD-E1 so that it can be handled as a new medium. , It is possible to prevent leakage of unnecessary confidential information recorded on the CD-E1. Furthermore, the CD-E1 after the entire erasure of the recording area can be reformatted and reused easily.
[0028]
(6) This inventionExampleOptical disc recording device
  UpLightIf the entire medium of the CD-E1 is erased like a disk device, the execution time of the erase becomes very long. For example, when erasing a 74-minute medium at a double speed that is twice the speed of a normal CD, it takes a little less than 40 minutes.
  Therefore, in order to be able to use it as a new medium for a short time, it is only necessary to erase the minimum necessary information for making the information on the CD-E1 unreproducible.
  That is, the track itself in which the user information on the CD-E1 is recorded 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.
[0029]
  As shown in FIG. 2, there are a PMA 22 and a lead-in area 23 as the area having the table of contents information on the CD-E1 medium. By erasing these areas, it is possible to prevent the track 24 from existing on the medium.
  Also, multiple lead-in areas can exist on the media, and numbers are assigned from the inside of the media, but each lead-in area can be specified from the lead-in area immediately preceding (inside). Therefore, if the first inner lead-in area on the medium is erased, there can be no lead-in area 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 or lead-in area. This incomplete track is a track in which information is recorded halfway, and the recorded information of the incomplete track is not recorded in the PMA and lead-in area, but is recorded in the pregap existing at the head of the incomplete track itself. .
[0030]
  Only one incomplete track can exist on the medium, and no other track exists after the incomplete track.
  Therefore, the present inventionExampleIn this optical disc recording apparatus, the minimum information necessary for the CD-E1 is erased so that the information recorded on the CD-E1 cannot be reproduced, and a new medium is obtained in a short time.
  Therefore, this inventionExampleIn the optical disk recording apparatus, the controller 9 irradiates the CD-E1 with laser light to record, erase, and overwrite information, and at the same time, the PMA on the CD-E1, the first lead-in area, and the first It functions as a means for erasing the pre-gap region of the track.
[0031]
  FIG. 9 shows the present invention.Example5 is a flowchart showing the entire optical disc erasing process in the optical disc recording apparatus of FIG.
  In this process, when a request to completely erase the information in the area designated by the user is received in step 51 (indicated by “S” in the figure), the process proceeds to step 52 to erase the PMA information, and the process proceeds to step 53. The information on the first lead-in area (first lead-in area) above is erased, and the process proceeds to step 54 to erase the information on the pre-gap of the first track, and this process ends.
  In this way, by deleting the information of the PMA 22, the first lead-in area 23, and the pre-gap 26 of the first track 24 on the CD-E1, the table of contents information and the incomplete track of all the tracks 24 cannot be referred to and reproduction is not possible. Can be possible.
[0032]
  Further, even if the information substance of the track 24 is left, the medium can be made pseudo like a new medium, and the information can be recorded and reused.
  Further, the erasure time can be shortened by the amount that the information of the track 24 is not erased. For example, if 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, erasing time is only 1 to 2 minutes if the information in these areas is deleted at double speed. .
  In the above-described erasing process, the order of erasing the PMA, the first lead-in area, and the pre-gap information of the first track is not limited to the order described above. As a result, the information in those areas is erased. If necessary, they may be deleted in any order.
[0033]
  In this way, the present inventionExampleAccording to the optical disk recording apparatus, the PMA 22, the first lead-in area 23, and the pre-gap 26 area of the first track 24 on the CD-E1 are erased to erase the track table of contents information and the presence of incomplete tracks. As a result, the information recorded on the CD-E1 can be made unreproducible, and unnecessary confidential information recorded on the CD-E1 can be prevented from leaking.
  Furthermore, the processing time can be greatly shortened by erasing the minimum necessary area to make the information on the CD-E1 unreproducible.
[0034]
(7) This invention6th reference technologyOptical disc recording device
  The recording unit of information of CD-E (same for CD-R) is a packet.
  FIG. 10 is a diagram showing an example of a format of a packet which is a recording unit of 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), 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 assigned.
[0035]
  On the CD-E1, information is recorded or erased in units of packets, and information cannot be recorded and erased at an arbitrary position in the packet 41.
  If an area that starts from a portion that is not the boundary of the packet 41 or ends at a portion that is not the boundary is recorded or erased, the consistency of the format on the medium is lost and the medium becomes an illegal medium. That is, if any information is erased or overwritten by ignoring the format on the medium, the medium becomes unusable.
[0036]
  Therefore, this invention6th reference technologyThe optical disc recording apparatus in FIG. 1 enables only the recording and erasing of information from the packet boundary and prohibits the recording and erasing of the other designated areas to prevent the CD-E1 from becoming illegal media.
  Therefore, this invention6th reference technologyIn the optical disc recording apparatus, the controller 9 functions as a means for prohibiting the erasing operation and reporting an error when the boundary of the designated area does not coincide with the boundary of the packet 41 of the information recording unit.
[0037]
  FIG. 11 shows the present invention.6th reference technology5 is a flowchart showing an optical disc information erasing process in the optical disc recording apparatus of FIG.
  In this process, when a request to erase the information of the area designated by the user is received in step (indicated by “S” in the figure) 61, the process proceeds to step 62, and the packet whose boundary of the designated area is a recording unit on the medium. If it matches, the process proceeds to step 63 to erase the information in the designated area. If not, the process proceeds to step 64 to prohibit the erase operation of the information in the designated area. Then, an error is reported and the process is terminated.
  The error report is sent to the host computer, which may display it on the display to alert the user.
[0038]
  In this way, the present invention6th reference technologyAccording to the optical disc recording apparatus, when the boundary of the designated area on the CD-E1 does not coincide with the boundary of the packet 41 of the information recording unit, the erase operation is prohibited, an error is reported, and the area to be erased By executing the information erasing operation only when the boundary of the packet coincides with the boundary of the packet 41, it is possible to maintain the consistency of the format of the recording area without breaking the packet 41 of the information recording unit on the CD-E1. It is possible to prevent unauthorized media.
[0039]
  In the above-described embodiment, the case where the CD-E is used as the optical disk 1 has been described. However, the present invention can be applied to other re-recordable media on which data can be additionally written.
  The optical disc recording apparatus according to the embodiment of the present invention makes unnecessary use of the information recorded on the medium by making full use of the characteristics of recording, erasing and overwriting of information on a re-recordable medium such as CD-E. Can be reliably prevented from being reproduced.
[0040]
【The invention's effect】
  As described above, according to the optical disk recording apparatus of the present invention, information recorded on an optically recordable optical disk cannot be reproduced and leakage of confidential information can be prevented.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an optical disk recording apparatus according to an embodiment of the present invention.
FIG. 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. 3First reference technology5 is a flowchart showing an optical disc information erasing process in the optical disc recording apparatus of FIG.
FIG. 4Second reference technology5 is a flowchart showing an optical disc information erasing process in the optical disc recording apparatus of FIG.
FIG. 53rd reference technologyIt is a figure which shows an example of the format of the subchannel in the sector of the minimum unit of the information of the optical disk used with the optical disk recording device of.
FIG. 63rd reference technology5 is a flowchart showing an optical disc information erasing process in the optical disc recording apparatus of FIG.
FIG. 74th reference technology5 is a flowchart showing an optical disc information erasing process in the optical disc recording apparatus of FIG.
FIG. 85th reference technology5 is a flowchart showing the entire optical disc erasing process in the optical disc recording apparatus of FIG.
FIG. 9 shows the present invention.Example5 is a flowchart showing the entire optical disc erasing process in the optical disc recording apparatus of FIG.
10 is a diagram showing an example of a format of a packet that is a recording unit of a re-recordable optical disc used in the optical disc recording apparatus shown in FIG. 1. FIG.
FIG. 116th reference technology5 is a flowchart showing an optical disc information erasing process in the optical disc recording apparatus of FIG.
[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: Subchannel 32: Subcode Q area
33: ADR 41: Packet
42: Link block 43: Run-in block
44: User data block
45: Run-out block

Claims (2)

In an optical disc recording apparatus that records, erases, and overwrites information by irradiating a laser beam to a re-recordable optical disc.
When receiving the deletion request for information of the designated area by the user, an intermediate recording area on the optical disc, the TOC information of the erase The first lead-in area, and a pre-gap area of the first track all tracks not An optical disk recording apparatus comprising means for preventing reference to a complete track . The optical disc has the intermediate recording area, the first lead-in area, and the first track pre-gap area from the inner periphery side. The intermediate recording area, the first lead-in area, and the first track pre-gap optical disc recording apparatus according to claim 1, characterized in that to perform said erase in order of region.

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