RU2225043C1 - Memory device (alternatives) - Google Patents

Abstract

FIELD: recording and reproducing digital data on mirror disk. SUBSTANCE: writable and/or re-writable data recording medium has initial area, final area, and user data area. Record medium stores record protection information capable of protecting data written on record medium against unwanted superposition or erasing of record; record protection information is stored as backup file in plurality of initial area locations. As an alternative, record protection information is stored as backup file in initial area, record medium being universal random- access digital disk. EFFECT: enhanced reliability of diskrecorded data protection against unwanted recording or erasing. 9 cl, 20 dwg, 2 tbl

Description

FIELD OF THE INVENTION
The present invention relates to optical recording and / or reproduction for recording digital data on a disc and / or reproducing data from it and, more specifically, a storage device for storing user-recorded data on a write-once or rewritable medium and protecting it from unwanted recording or erasure , and a recording medium for storing write protection information.

State of the art
The writeable digital versatile disc standard (DVD-R, DLC) and the write-once and multiple-read standard (WORM, OZMC) are standards for write-once discs, and the digital versatile random-access disc standard (DVD-RAM, DAC) and the standard rewritable digital versatile disc (DVD-RW, DPS) are the standards for rewritable disc.

 According to the DACCS standard published in July 1997 under the title “CAC Specifications for a rewritable disc, Part 1“ Physical Specifications, Version 1.0, ”the DACCS contains a cassette containing a disc, and discs from type 2 and type 3 cassettes can be used after removal from the cassette in the form of open discs.

 The following three types of cassettes are defined for the DACC drive. A Type 1 cartridge has a single-sided disc or double-sided disc, and the installed disc cannot be removed from the chassis. A single-sided disc is installed in a Type 2 cassette, and the installed disc can be removed from the housing. However, when the disk is removed from the housing once, the opening of the sensing element capable of sensing the removal of the disk constantly changes to the open state so that the opening of the sensing element cannot be changed to the closed state again. Thus, it is possible to determine whether the disk has been removed from the case or not. In a Type 3 cassette, the opening of the sensing element, also capable of determining whether the disk was removed from the case or not, opens at an early stage, so the disk can be removed from the case and installed in it without restriction.

 In addition, the cassette has a recording prohibition hole (alternatively called a “recognition switch for recording protection”), and in accordance with the standard (p.69), recording is possible when the recording prohibition hole is closed and impossible when the recording prohibition hole is open . That is, when the user intends to protect the data recorded by him from unwanted recording overwriting or erasing, the corresponding recording prohibition hole in the closed state changes to the open state, so that the recording device cannot record onto the disc of the corresponding cartridge.

 However, in a case using a Type 2 or Type 3 cartridge, a frameless disk can be used without a case, as described above. This is because the disc can be used in a thin recording-reproducing device, for example in a compact portable computer, in which it is impossible to install a cassette. However, the above specifications will not define any write protection aside from the recording prohibition hole attached to the cassette.

 For example, when a user, after removing a disc installed in a case that protects against writing, inserts the disc into a thin recording-reproducing device in which it is not possible to insert a cassette, the write protection by the recording prohibition hole is no longer valid.

 In addition, there are many specifications related to the DAC, for example, the DAC specification for read-only memory (DVD-ROM specification, ROM for the DAC), the DAC specification (the DAC specification for a recordable disc). In addition, you can take into account many specifications for rewritable DACs that are not yet defined, for example, the DAC specification for a rewritable and readable disc, which is very similar to the DAC specification and the DAC specification for a higher density disc. This series of specifications with the prefix of the DAC is called the “DAC family”.

 A computer-based system also contains various attributes, for example, read-only and write protection, which is able to prevent arbitrary changes in recorded data using the attributes of the file in which the data is recorded. However, when disk management is performed at a lower level than that of the file system for managing the file, for example, when recording and playback are not performed directly through the file system, when the disk is initialized, where the entire file system is not referenced, or in the case when the attributes each file cannot be taken into account, this method is not a reliable way of protection. Therefore, the way to protect the data of the open DACC from undesirable overwriting or erasing is not yet widespread.

 In the case of the DACC, the disc can be used in an unpacked condition, as well as in the housing. However, in the case of a DLC or PLCA, it is not possible to use a disk in a case, so that the need to protect a frameless disk from unwanted recording or erasure increases. However, when using a case-free disk removed from the case, it is impossible to use the recording prohibition hole, therefore, write protection must be provided on the disk itself.

 The DVAC specification, specification 3.95GB (version 1.0), and specification 4.7GB (final plan, version 1.9) do not mention the write protection method for an open disk. Meanwhile, the specifications of the PZCUD were prepared on the basis of the specifications of the PLCA, and, in particular, version 1.9 defines the use of a housing without a case. However, if the additional specification defines the use of the disk in the case (for example, continued use), then the write protection method to the caseless disk will not be applicable, since the usual write protection method is used, which is applied to the DACU using the recording prohibition hole.

 If the PZUDA specification allows the use of a housing, then recording can be prevented by using the recording prohibition hole, as in the DACS. However, if the user has forgotten to put the state of the write inhibit hole into the write ban position, then an unexpected erasure or data recording overlay may occur.

SUMMARY OF THE INVENTION
An object of the present invention is to provide a storage device for storing write protection information on a recording medium in order to protect data recorded on the recording medium from unwanted recording overwriting or erasure.

 Another objective of the present invention is to provide a storage device for backing up write protection information in an initial area of a recording medium in order to protect data recorded on the recording medium from undesired overwriting or erasing.

 To solve the first problem, a storage device is proposed comprising a recordable and / or rewritable recording medium including a start area, an end area and a user data area, and a cassette having a housing that receives a recording medium, the recording medium storing write protection information for protect data recorded on the recording medium from unwanted recording overwriting or erasing, while the recording medium is a digital random access disk (DAC).

 To solve the second problem, a storage device is proposed comprising a recordable and / or rewritable recording medium including a start area, an end area and a user data area, and a cassette having a housing that receives a recording medium, the recording medium storing write-back information in the initial area for protecting data recorded on the recording medium from unwanted recording overwriting or erasing, wherein the recordable and / or rewritable recording medium is digital th versatile disc random access (TSUDPD).

Brief Description of the Drawings
The above objectives and advantages of the present invention will become clearer from the detailed description of its preferred embodiments with reference to the accompanying drawings, in which:
FIG. 1 is a perspective view of a cassette for a digital universal random access disk (DACC) having a recording prohibition hole;
Figure 2 illustrates the structure of a conventional DACC;
FIG. 3A and 3B illustrate the data structure of a defect management area (DMA) of a conventional DACC;
FIG. 4A and 4B illustrate examples of a data structure of a DACC DACS for storing write protection information in accordance with the present invention;
5A and 5B illustrate further examples of the data structure of the DACC DACS for storing write protection information in accordance with the present invention;
FIG. 6, 6a are a flowchart illustrating a write protection method according to a preferred embodiment;
FIG. 7 is a flowchart illustrating a method of adjusting write protection information;
FIG. 8 illustrates the structure of a disc identification area for storing write-protect information in accordance with the present invention;
FIG. 9 illustrates the data structure of the write protection information stored in the disc identification area shown in FIG.
FIG. 10 illustrates a disc structure satisfying the general specifications of a DAC and a DAC;
11 illustrates the structure shown in figure 10 of the initial area;
FIG. 12 illustrates the structure of the control data area shown in FIG. 11;
FIG. 13 illustrates the contents of a Record Management Data Field (DLD) of a Record Management Area (DLD) in accordance with the specifications of the DAC and the DAC;
FIG. 14 illustrates the contents of the conventional 0 field SAR shown in FIG. 13;
FIG. 15 illustrates the contents 0 of a DLD field for storing write protection information in accordance with the present invention, and
FIG. 16 is a flowchart illustrating another write protection method.

Description of preferred embodiments of the invention
Figure 1 shows the recording prohibition hole of the cartridge corresponding to the DACS specification, note that reference numeral 1 shows the recording prohibition hole, and reference numeral 2 shows the hole of the sensing element used to determine whether the disc has been removed from the case.

 In figure 1, the closed hole 1 of the prohibition of recording indicates that the recording is allowed, and the open hole 1 of the prohibition of recording indicates that the recording is prohibited. Thus, when the recording prohibition hole 1 in the corresponding DACCM recording / reproducing device is opened, data recording to the disc is prohibited even if a write command is input from the outside, so that information recorded on the disc can be protected from unwanted recording overwriting.

 Figure 2 shows the structure of a disk that meets the specifications of the DAC. The disk consists of three parts, that is, the start area, the user data area, and the end area in the function aspect. In addition, the disc can be divided into a rewritable area and a non-rewritable area. In particular, the initial region comprises a read-only zone in the innermost part, which is a zone of unwritable relief data having recesses, and a region of rewritable data after the read-only zone, in which both recording and reproduction can be performed. Meanwhile, the final area and the user data area contain only the rewritable data area. The read-only zone of the initial area contains information about the physical characteristics of the disk. The rewritable data area of the initial region and the final region contains four defect management areas OUD1, OUD2, OUD3 and OUD4, in which information about disk defects is recorded, a disk test area for use by the manufacturer of the disk when checking the condition of the disk, and a drive test zone for testing recording and playback operations in the recording-reproducing device, the protective track area and the disc identification area.

 In version 1.0 of the DACC specification, the purpose of using the disk identification zone and its contents are not yet clearly described.

 On figa and 3B shows the data structure in the field of defect management (OUD), in particular described on p.155-158 specifications DACS, and especially they show the data structure of the sign of certification of data and sign of certification of the group, respectively, in the field of the structure of the definition of the disk (SOD )

 All four defect management areas OUD1, OUD2, OUD3 and OUD4 are in the initial region and the final region, with OUD1 and OUD2 are in the initial region and OUD3 and OUD4 are in the final region, and identical information regarding disk defects and disk initialization. The recording of such identical information in different areas, that is, in two areas of the OUD1 and OUD2 of the initial region and two regions of the OUD3 and OUD4 of the final region, is carried out to prevent the problem of unsuitability of data for use due to disk defects.

 As shown in FIG. 3A, in the 3rd byte position, that is, BP3 of the disc definition structure (SOD), there is a disc certification sign, and the disc certification sign contains “in progress” information showing the initialization state of the disc, the sign of “user certification” indicating whether the disk is allowed by the user, and the sign of “certification of the disk manufacturer” indicating whether the corresponding disk is allowed by the disk manufacturer, and the indicative information recorded in byte position BP3 is information about the entire disk.

 In addition, in byte positions 16-39, that is, BP16-BP39, each byte has a group certification attribute, as shown in FIG. 3B, in an identical configuration. Byte positions BP16-BP39 have initialization information of approximately 24 recorded areas, that is, a group defined in version 1.0 of the DACS specification. That is, each group certification attribute has “in progress” information showing the initialization status of the corresponding group, and a “user certification” attribute indicating whether the user has allowed the disk. Here the group indicates the special recordable areas of the disc.

 In FIG. 4A and 4B illustrate examples of data structures of a disc certification feature and a group certification feature of a disc definition structure (SOD) area of a defect management (DMA) area in which write protection information is recorded in accordance with the present invention. In the data structure shown in FIG. 4A of the disc certification attribute, the “write-protect disc” information is stored in the binary bits b4 and b3 of the backup backup certification attribute of the disc, in contrast to the data structure shown in FIG. 3A of the disc certification attribute, and is determined as follows.

Disc write protection
b4, b3 = 00b - the disk is not write-protected.

 10b - the disk is write protected. Recording will not be performed on the entire disc, with the exception of the drive test area and the OUD area.

 11b - the disk is write protected. It will not record on the entire disc. These binary bits will not change to other values.

 Others are backups.

 In the same manner, the data structure of the group certification attribute shown in FIG. 4B stores the “write protection of the group” information in binary digits b4 and b3 of the backup certification attribute of the “Backup” group, as opposed to the data structure of the group certification attribute, shown in FIG. 3B, and defined as follows.

Group write protection
b4, b3 = 00b - the group is not write protected.

 10b - the group is write protected. User data will not be written to this block.

 Others are backups.

 Table 1 shows the status of the binary bits b4 and b3 of the sign of certification of the disk and the status of the binary bits b4 and b3 of the sign of certification of the group.

 In Table 1, flexible write protection means that write protection can be released (unlocked), that is, the write protection state can be changed to a rewritable state by setting the corresponding binary bit b4 to "0". Hard write protection also means that write protection applies to the end area as well as the start area, so that the write protection state cannot be restored to a rewritable state.

 Hard write protection for a group that makes part of the disk hard-written, does not provide advantages for the user in use, but not in the technical aspect, and, in particular, there is a processing problem in the corresponding group when the entire disk is re-initiated. Thus, it is not practical to set hard write protection for a group.

 As shown in the data structure of FIGS. 4A and 4B, the disc write protection information is recorded in the disc definition structure (SOD) of the defect management area (ODM), and the identical write protection information is recorded four times on the same disc, so that the disk increases the reliability of the write protection information.

 When a write-protected casing is inserted for use in a case whose write-protect hole is in a rewritable state, or if a casing that is not write-protect is inserted in a case whose write-protect hole is in a write-protected state stored on disk write protection information cannot be matched with the state of the recording prohibition hole of the case.

 In this case, if either the disc or the case is write-protected, they prefer such operation that it is suitable for the write-protect state. This is because, in the user's position, it is preferable that the content of the data in this case is also checked without overwriting, instead of important data being corrupted due to overwriting.

 FIGS. 5A and 5B show further examples of data structures of a disc certification feature and a group certification feature, respectively, of a disc definition structure (SOD) area of a defect management (DMA) area that stores write protection information in accordance with the present invention.

 In the case where the write protection information is in the disc certification attribute shown in FIG. 5A, only one binary bit b4 can be used, regardless of whether the write protection information is intended for hard write protection or for flexible write protection, which is defined as follows.

Disc write protection
b4 = 0b - the disc is not write protected.

 1b — Cannot be written to the entire disc, with the exception of the drive test area and the EAL area.

 Referring to FIG. 5B, a group test flag may store write protection information using only one binary bit b4, which is defined as follows.

Group write protection
b4 = 0b - the group is not write protected.

 1b — the group is write protected. User data will not be written to this block.

 In this case, it is preferable to use the binary bit b4 of the disc certification tag and the binary bit b4 of the group certification tag. However, instead of using the binary bit b4 of the disk certification flag or the group certification flag, any “Backup” binary bit can be used.

 In addition, you can not use the binary bit b4 sign of the group certification, that is, the sign of "write protection of the group." This is effective in a drive in which only a special group is not write-protected, in which case the binary bit b4 of the group certification flag is “Backup”, as in the normal specifications.

 The present invention can be applied to a case without a recording prohibition hole, and information on a disk can be effectively protected in that case using write-protected information stored on the disk.

 In FIG. 6 is a flowchart illustrating a write protection method according to a preferred embodiment of the present invention. First, it is checked whether the disk is installed in the case (step S101), and if the disk is installed in the case, the condition of the write-off hole of the case is checked (step S102). That is, when the recording prohibition hole is closed, this means that the cassette is not write protected. When the recording prohibition hole is open, it means the cassette is write-protected.

 If it is determined in step S101 that the disc is not installed in the case, or after checking in step S102 the state of the write inhibit hole, the sign of write protection of the disc is checked (step S103). That is, the signs of write protection are checked in the sign of disk certification and the sign of group certification.

 At step S104, it is determined whether the write protection information is consistent with the state of the recording ban recording hole. That is, when the write protection information is recorded on the disc and the case of the write prohibition hole of the case is open, it is determined whether the write protection flag of the disk certification mark is set to the "write protection" state (step S105). Otherwise, the user is informed that the write protection information of the disc is not consistent with the state of the case of the write ban of the case (step S106).

 If the write protection flag of the disc certification attribute is set in step S105 as a write protection state, or if either the disk or the case shows a write protection state, even if both write protection states of the disk and the case are not consistent in step S106, check ( step S107) whether the disc is set to the "hard write protection" state. If the disk is set to the "hard write protection" state, it is prohibited (step S108) to write data on the entire disk, including the start area and the end area, but not the user data area. Otherwise, it is prohibited (step S109) to write data in the user data area, and not in the drive test area and the defect management (OA) area.

 If it is determined in step S105 that the write protection flag of the disc certification attribute is not set to the "write protection" state, then it is checked whether the write protection flag of the group certification attribute is set to the "write protection" state (step S110). If the group certification attribute is set to the "write protection" state, then data recording in the corresponding group is prohibited (step S111). Otherwise, data recording is allowed in the rewritable area (step S112).

 Shown in FIG. 6, the write protection method corresponds to the case of using the disc certification feature containing the hard write protection feature shown in FIG. 4A and the group certification feature shown in FIG. 4B. When the disc certification attribute shown in FIG. 5A and the group certification attribute shown in FIG. 5B are used, the steps S107 and S108 shown in FIG. 6 are not performed. When, in step S105, the disc certification flag is set to the "write protection" state, data recording in the user data area in step S109 is prohibited.

 FIG. 7 is a flowchart illustrating a method of setting a rewritable disc in a write-protect state or changing a write-protect state of a disc to a rewritable state. A method for correcting write protection information will now be described with reference to the one shown in FIG. 7 block diagram.

 As shown in FIG. 7, when a disc or cassette is inserted in the recording / reproducing apparatus, the write protection information is checked (step S201). Then, it is determined (step S202) whether the user has entered the write protection information, and after the user has entered the write protection information, it is determined (step S203) whether the user has set the write protection information. If the user-set information is write-protect information, then the corresponding write-protect flag of the disc is set to the write-protect state (step S204).

 If the information set by the user in step S203 is not the write protection information, then it is determined (step S205) whether the information set by the user is the write protection release information. If the user-set information is write-protection release information, it is determined (step S206) whether the current disk is in a hard-write-protected state. If the current disk is in a hard write protection state, the user is informed (step S207) that the write protection cannot be released. If it is determined in step S206 that the disc is not in a state of hard write protection, then the corresponding write-protect flag of the disc is set to the overwrite state (step S208).

 In addition, when completing the write protection setting or releasing the write protection of the disc, that is, when completing steps S204, S207 or S208, and installing the disc in the case, it is determined in step S209 whether the state of the write-protect hole of the case is consistent with the write protection information, stored on disk. If the state of the case of the write-inhibiting case is not consistent with the state of the disc, the user is informed of such a difference (step S210), and then the procedure is completed.

 The method for correcting write protection information shown in FIG. 7 can be performed by inserting a case-free disk or inserting a disk into the case and can be performed after the write protection control using the write protection information, as described with reference to FIG. 6.

 In a preferred embodiment of the present invention, disc write protection information is recorded in the disc defect management area. However, instead of the disc defect management area, the disc identification area shown in FIG. 2 can be used. A disc identification area is present in the start area and in the end area, similar to the disc defect management area. Thus, recording identical information two or more times in the disc identification zones located in the initial region and in the final region can guarantee reliability to the same extent as in the field of disk defect management.

 Since the disk identification zone is not currently used for a specific purpose, the advantage is that the disk identification zone does not contradict the information recorded in the disk defect management area. In particular, the information of the defect information area applies only to the DACS, so it is difficult to maintain compatibility between discs for optical recording-reproduction. Meanwhile, since the disc identification area is not limited to a special disc, the disc identification area can be maintained consistent with another disc satisfying similar specifications.

 An example of storing write protection information using the disc identification area will be described with reference to FIGS. 8 and 9.

 As shown in FIG. 8, in the structure of the disk identification zone that stores the write protection information for the open disk, four signs for write protection are simultaneously recorded in the disk identification zone and two or more conventional signs of the four signs are read. If the contents of the read indicia are consistent with each other, it is considered that the write protection of the disc is set.

 For example, four features are recorded only in the disc identification area of the start area, and disc identification information of a block size of 1 block (equal to 1 byte) is sequentially recorded four times in four blocks from the start of the disc identification area of the start area, and all first bytes of the disc identification information contain a security feature from the record. The identification information of the disk 1 block size summarize, as shown in table 2.

 The write protection feature (ST) of the disc identification information corresponds to the oldest binary bit (BSS) of the first byte, as shown in FIG. 9. When the value of the feature (indicated by the "ЗЗ" symbol) represents 1b (binary), this means that the entire area of the disc is write-protected, except for the disc identification area and the disc test area. In addition, when the attribute value represents 0b, this means that the entire area of the disk is rewritable. That is, "ZZ" in Fig.9 is defined as follows.

 ЗЗ = 1b - the entire area of the disk is write-protected, with the exception of the drive test zone and the disk identification zone.

 = 0b - the entire area of the disk is not prohibited for writing.

 The reason for reading only two common signs from the four recorded signs of write protection is as follows. In the event that only one write protection feature is recorded, an error can be created in the area in which the corresponding feature is recorded, so that the area cannot be used. In addition, if only reading is allowed, and not writing, then there is the possibility of abnormal operation, so that information may not be permanently written to disk due to erroneous reading of the corresponding attribute.

 Meanwhile, when recording write protection information in a large number of locations, the problem is that the time required to read the corresponding information is increased. That is, the time required for a number of processes, from inserting a disk, including reading various information from the disk and recognizing the information required to control the disk by the microcontroller, can increase.

 However, in the case of correcting the write protection information, only the correction operation is performed. That is, due to the fact that information is not read, the recording time in units of several hundred milliseconds should hardly be taken into account. Thus, recording at four locations is performed due to the reliability of the information, and the possibility of correcting errors during reading is taken into account. That is, if two errors are not created or usually corrected signs are read and two of them coincide with each other, then the write protection status of the disk is set without reading the rest of the signs, thereby increasing the speed of work.

 The write protection method proposed above is not limited only to the DAC, but it can be applied to a disk that has technical data that is physically the same as the ZTSUD-PZTSUD disks and similar to the DAC specifications that will now be described.

 Figure 10 shows the structure of the disk corresponding to the general specifications of the disks ZTSUD and PZTSUD. The disc is roughly divided into two parts with respect to functionality, including an information recording area (H) and an information area. The information area H is divided into a power calibration area (OKM) for power calibration and a recording management area (RAM) showing general information regarding the recording, that is, information about the disc recording mode, recording status, optimal power control and framing area, and the information area is divided into the start area, the area of recorded data in which the user can record data, and the end area, which is not yet defined in the specifications of the DAC and PZCUD.

 As shown in FIG. 11, the initial region contains an initial zone (content: 00h) for which a specific purpose is not defined, a reference code zone (channel binary code 3T-6T-7T) used to control the RF correlator in the drive, the first and second buffer zones (contents : 00h) and a control data area including the contents shown in FIG.

 12, information on the physical format of the control data zone represents information on types and versions of specifications, disk size, maximum transfer rate, wild structure (one-way / two-way), recording density and distribution of the data area, and information about the manufacture of the disc is not associated with compatibility .

 In FIG. Figure 13 shows the contents of the Record Management Data Field (DLC) of the Record Management Area (DLC) corresponding to the specifications of the DAC and the DAC. The SCL contains the initial SCL area, which includes the system reserve field (content: 00h) and the unique identification field and the CRM field. As shown in Fig. 13, one field of remote sensing consists of 16 sectors, in which the first sector is assigned as the area of communication loss, ordinary disk information is stored in 0 field of remote sensing, information related to optimal power control (UOM) is stored in 1 field DUZ, special user data (content: 00h) are stored in the 2 DUZ field, and information about the border zone is stored in the 3 DUZ field. In addition, in the case of a ZCDU disk that meets the specifications of version 1.9, whenever a recording is made in 4-12 fields of remote sensing, information of the Z-zone (recording zone), which includes recording elements, is stored, and 13-14 fields of remote sensing are reserved.

 In the case of a rewritable or erasable disc of the CPSU, the specifications of which have not yet been determined, the 3-zone information is stored in the 4th remote control field, and the 5th remote control field and the 12th remote control field are assigned to store information related to the management and certification of defects, taking into account the reliability used, certification before using the disk and defect management. The 13th DLM field and the 14th DLM field are also reserved.

 On Fig shows the contents of the usual information of the disk stored in 0 field DLD of Fig. 13. In Fig. 14, the byte positions BP0 and BP1 store information about the DPS format (recorded only from 0001h), the byte position BP2 stores information about the state of the disk, and the byte position BP3 is reserved. Byte positions BP4-BP21 store information about the unique identifier of the disk, which stores the date and time of data recording in the form of an ASCII code (American Standard Code for the exchange of information). In the byte positions BP22-BP85, the information of preliminary excavations is copied, and the remaining byte positions BP86-BP2047 are reserved. Here, on the ZCDU disk, information about the state of the disk stored in the byte position of BP2 is determined as follows.

BP2 - disk status
00b - indicates that the disk is empty.

 01b - indicates that the disc is in instant recording mode.

 02b - indicates that the disc is in incremental recording mode.

 03b — Indicates that the drive is terminating when incremental recording is used.

 Others are backups.

 On Fig presents an example of a table showing the state when the write protection information is stored on a disk containing the specifications of the drives ZUDA and PZUDA, corresponding to the present invention, using the usual information of the drive stored in 0 field DLD of Fig.13.

 That is, by determining the subsequent use of the backup byte position BP3 0 of the DPS field, information can be transmitted to the drive that the current disk is write protected.

 BPZ - a sign of write protection.

 00b - Indicates that the disc is not write protected.

 01b - indicates that the disk is write protected (hard).

 02b - indicates that the disk is write-protected (flexible). Recording will not be performed on the entire disc, except for OKM and so on.

 In the recording protection information of the present invention, 00b indicates that the disc is not write protected. 01b indicates that the entire disk is write-protected (hard write protection), and 02b shows that the entire disk, with the exception of part of the disk (for example, OKM), is write-protected (flexible write protection). In the present embodiment, the write protection information indicates that the entire disc is write protected or not write protected. However, information associated with the previous data is recorded in the DLD field of FIG. 13 whenever new data is recorded, so that write protection can only be set for recorded data corresponding to the DLD.

 For example, even if the write protection information is stored in the byte position BP3 0 of the remote sensing field, in addition to the remote sensing area, it is possible to write the write protection information on the open disk using the start region and end region shown in Fig. 10. In addition, the byte position of BP2 0 of the DLD field stores information about the state of the disc, so that write protection information can be stored in the byte position of BP2 of the DLD.

 Since the write protection information cannot be adjusted in the DVAC after the recording, given the consistency with the family of the DAC disks, the write protection information can be displayed through finalization, which means recording in a specific start area and end area. That is, the fact that the finalization is completed indicates that the DAC is write-protected. Otherwise, this means that there is no write protection.

 In addition, since in the field of defect management OUD1, OUD3 and OUD4 of the DACCD disc, the same content is recorded many times in order to eliminate errors, this guarantees reliability. In the WLCA and PWCA, such reliability is guaranteed by grouping the data of the remote sensing data of the special educational institution and providing the data of remote sensing belonging to the same group with the same content.

 The drive must include format information whenever the current drive is a DVR or PZUD, so that the DVZ drive and the PZUD drive are compatible in the same drive. As shown in Fig. 15, the format of remote sensing can be determined using the byte positions BP0 and BP1 of the remote sensing field as follows.

BP0, 1 - DUZ format
0001h - for writing.

 0002h - for rewriting.

 0003h - for recording and rewriting compatible mode.

 FIG. 16 is a flowchart illustrating a write protection method taking into account the distribution of application to the DSCD contained in the housing. FIG.

 First, it is determined (step S301) whether the disk is installed in the case. If the disk is installed in the case, then check (step S302) the condition of the write-off hole of the case. That is, if the recording prohibition hole of the case is closed, this means that the cassette is not write-protected, and if the recording prohibition hole is open, this means that the cassette is write-protected.

 If the disc in step S301 is not installed in the case, or when the state of the write inhibit hole is checked in step S302, the sign of write protection of the disc is checked (step S303). That is, they check the sign of write protection in the 0 field of remote sensing.

 Then, it is determined whether the write protection information corresponds to the state of the case of the write ban of the case (step S304). That is, when the write protection information is recorded on the disc and the case of the write ban on the case is open, it is determined (step S305) whether the write protection flag is in the “write protection” state. Otherwise, the user is informed that the write-protect information of the disc does not correspond to the state of the write-protect hole of the case (step S306).

 If, in step S305 or after step S306, the write-protect flag of the disc is set to the "write-protect" state, i.e. if either the disk or the case is in a “write protection” state, even if the write protection information of the disk is not consistent with the state of the write-ban hole of the case, it is determined (step S307) whether the disk is set to the “hard write protection” state. If the disk is in the “hard write protection” state, then the entire disk, including the user data area, is write protected (step S308). Otherwise, only the user data area is protected from writing (step S309). In addition, if in step S305 the write-protect flag is not in the “write-protect” state, the disc is not write-protected (step S310).

 On a recordable and / or rewritable medium according to the present invention, for example, a disk that complies with the specifications of the DAC, for example, DACS, DACS, and DACS, the data of a housing that is not contained in the housing can be effectively protected. In addition, when either the case or the disk is in write protection, data recording is prohibited and the user is given the opportunity to check the status of the disk or cartridge. As a result, data recorded on a disc can be effectively protected from unwanted overwriting or erasure.

Claims (9)

1. A storage device comprising a recordable and / or rewritable recording medium including a start area, an end area and a user data area, and a cassette having a housing that receives a recording medium, the recording medium storing write protection information to protect data, recorded on the recording medium from unwanted recording overwriting or erasing, while the recording medium is a digital random access disk (DAC). 2. The storage device according to claim 1, characterized in that the housing has a recording prohibition hole. 3. The storage device according to claim 1, characterized in that the recording medium stores write protection information for protecting data stored on the recording medium from undesired overwriting of write protection information or erasure using write protection information stored in physically separated Recording media locations 4. The storage device according to claim 3, characterized in that the recording medium is a disk, and the write protection information is stored in the initial area many times. 5. The storage device according to claim 4, characterized in that the write protection information is stored four times. 6. The storage device according to claim 5, characterized in that the length of the write protection information is at least one byte. 7. A storage device comprising a recordable and / or rewritable recording medium including a start area, an end area and a user data area, and a cassette having a housing that receives a recording medium, the recording medium storing back-up write protection information in the initial area to protect data recorded on the recording medium from unwanted recording or erasure, the recordable and / or rewritable recording medium is an arbitrary digital disc nym access (TSUDPD). 8. The storage device according to claim 7, characterized in that the write protection information is stored four times. 9. The storage device of claim 8, wherein the length of the write protection information is at least one byte.

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