JP2003006017A - Method and device of recording - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device of recording to restore information to point a recorded place of substantive data of a file when a fault is generated in the information. SOLUTION: The method of recording to record data in a recording medium based on a hierarchical file system is constituted so that management information to manage hierarchical structure of the file system is recorded in a specific area SMA of the recording medium, an unused area in the specific area SMA is handled as a special file SMF, the information FE to point a place in which actual data of the file is recorded is doubly recorded in the recording medium as normal information and backup information and specific information FID to point places where the normal information and the backup information are recorded in an area which becomes vacant in the specific area SMA by reducing size of the special file SMF.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording method for recording data on a rewritable recording medium in a hierarchical file system, and in particular, a failure has occurred in information indicating a substantial data recording location of a file. In this case, the present invention relates to a recording method capable of recovering the information. The present invention also relates to a recording device that uses the recording method.

[0002]

2. Description of the Related Art In recent years, DVD (Digital Versatile Disc)
The development of high-density optical discs, represented by, is progressing, and the standardization of standards is in progress. Thus, for the purpose of absorbing the difference in various physical storage modes depending on the media type as much as possible and constructing a logical structure that provides a highly common information storage unit for applications, the UDF
(Universal Disk Format) was established. Rewritable DVD-RAM (DVD-Random Access Memory) is
A logical format according to this UDF is used. And a writable CD-R or a rewritable CD
-RW can also apply this UDF.

The UDF is composed of a hierarchical file system, and sub directories and substantial files are referred to by the information stored in the root directory. Then, the UDF refers to another sub-directory from the information stored in the sub-directory,
A substantive file reference is made. Hereinafter, the directory is abbreviated as “Dir.”.

The recording area on the disc is accessed with a sector as a minimum unit. For example, in a DVD-RAM,
Access is made from the inside to the outside of the disc. From the innermost side, a system area in which volume information is written is arranged following the lead-in area, and VRS (Vol
ume Recognition Sequence), MVDS (Main Volume Des
criptor Sequence), LVIS (Logical Volume Integri)
ty Sequence) and AVDP (Anchor Volume Descriptor)
or Pointer) is written.

Root Dir. File entry (F
Ile Entry, hereinafter abbreviated as “FE”. ) Is written in the recording area from AVDP to MVDS and FS.
It is recognized by sequentially referring to D. The FE is composed of attribute information of files and directories and an allocation descriptor (Allocation Descriptor, hereinafter abbreviated as "AD"). AD is information on the logical address and the size (length) of the file or directory, and by this, the recording area in which the actual data (actual data) of the file is recorded or the recording area in which the substance of the directory is recorded. Is shown.

Root Dir. In FE of AD, the root as an entity by AD ・ Dir. The logical address and size of Root Dir. Is one or more file identifier descriptors.
r, hereinafter abbreviated as "FID". ), And by FID, the root Dir. The sub-Dir. FE
Or the FE of the file is referenced. By these FEs, the corresponding sub-Dir. And the entity of the file is referred to by each AD. In addition, sub D
ir. The entity of can further include one or more FIDs. That is, in UDF, the root Di
r. Except the sub Dir. Recorded on the disc.
And files use FID and FE as pointers, and
The ID, FE and entity are accessed and recognized in this order. In UDF, this FID, FE, and substance may be written anywhere in the recordable area.

[0007]

By the way, when the disc is in use or the like, the FE of the file indicating the recording area (location) in which the actual data of the file is recorded has some trouble, and the drive device is In some cases, the FE cannot be read. In such a case, the FE of the file cannot be read even if the actual data of the file, for example, the moving image data, the audio data, or the like has not failed, and thus the actual data cannot be accessed. was there.

Therefore, the object of the present invention is to FE the file.
By providing a backup, the recording method and apparatus are provided which can restore the FE of a file by referring to the backup when the FE of the file has a failure.

[0009]

According to the present invention, a recording method for recording data on a recording medium based on a hierarchical file system records management information for managing a hierarchical structure of the file system in a specific area of the recording medium. In this way, the unused area in the specific area is treated as a special file, and the information indicating the location where the actual data of the file is recorded is dually recorded on the recording medium as the regular information and the preliminary information. By making the size of the special file small, the designated information indicating the place where the regular information and the preliminary information are recorded is recorded in the empty portion in the specific area.

Further, according to the present invention, the recording apparatus for recording data on the recording medium based on the hierarchical file system, means for recording management information for managing the hierarchical structure of the file system in a specific area of the recording medium, Means for treating an unused area in a specific area as a special file, means for dually recording information indicating a location where actual data of the file is recorded on a recording medium as regular information and auxiliary information, By reducing the size of the special file, a unit for recording designation information indicating a place where the regular information and the preliminary information are recorded is provided in a portion vacated in the specific area. In such a recording method and recording apparatus, since the information indicating the location where the actual data of the file is recorded is double recorded, it is possible to improve the security of the information.

According to the present invention, in such a recording method and recording apparatus, if the regular information is unreadable due to a failure or the like, the regular information is newly restored onto the recording medium. You can Therefore, even if the regular information cannot be read, the actual data of the file can be read. Further, when the regular information cannot be read, the regular information is restored each time using the preliminary information, so that the actual data of the file can be read unless the regular information and the preliminary information cannot be simultaneously read. .

Further, according to the present invention, in the above-mentioned recording method, the entire specific area is directly copied to another area, and the entire copied specific area is treated as one backup file. When the data cannot be read, the data corresponding to the part in the backup file is used to reduce the size of the special file to manage the unreadable data in the empty part generated in the specific area. Recover some of the information.

In such a recording method, since the original management information can be restored by using the backup file, even if a part of the management information fails,
It is possible to reliably reproduce the actual data recorded on the recording medium. Since the data to be restored is placed in the specific area where the original management information is placed, the management information can be put together in the specific area after the restoration. Therefore, even after the restoration, the hierarchical structure of the file system can be read at high speed, and the reproduction start time can be shortened as compared with the conventional case.

Further, according to the present invention, in the above-mentioned recording method, the information regarding the initial location and size in the special file and the information regarding the current location and size in the special file are recorded in the specific area. .

In such a recording method, the information on the initial location and size in the special file and the information on the current location and size in the special file are recorded in the specific area. The location and size of can be surely recognized.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In each figure, the same components are designated by the same reference numerals.

FIG. 1 is a schematic diagram showing the logical format of a disc-shaped recording medium in association with the disc shape.

In FIG. 1, the logical format of the disk-shaped recording medium 10 is UDF (Universal Disk Format).
According to. In the disc-shaped recording medium 10, a lead-in area 11 is arranged at the innermost circumference. A logical sector number (Logical Sector Number, hereinafter abbreviated as "LSN") is assigned from the outside of the lead-in area 11, and the volume information area 12 and the RSA (Reserved Space Are) are arranged in that order.
a) 15, SMA (Space Management Area) 16, FSA
(Free Space Area) 17 and volume information area 1
3 is arranged, and the lead-out area 14 is arranged at the outermost circumference. With respect to the logical sector number, the first sector of the volume area 12 becomes the reference “0”. On the other hand, RSA15, SMA16
In addition, the FSA 17 has a logical block number (Logical Block Numbe
r, hereinafter abbreviated as "LBN". ) Is assigned.

VRS, MVDS, and LVIS are written in the volume information area 12 based on the UDF regulations. AVDP is placed in the LSN 256 in the volume information area 12. Furthermore, the AVDP includes the sector of the final logical sector number and (final logical sector number-2
It is also written in sector 56). The contents of the MVDS are stored in the volume information area 13 inside the lead-out area 14 in the RVDS (Reserve Volume Descriptor Seq).
uence) is written twice.

A partition area is provided between the logical sector numbers 272 and (final logical sector number -272). RSA15, SMA16 and FSA17
Are arranged in this partition area. The RSA 15 provided on the innermost side of the partition area is FSDS (File Set Descriptor Sequenc
e) and SBD (Space Bitmap Descriptor), and F
SDS consists of FSD (File Set Descriptor) and TD (Termi
nating Descriptor). The SBD stores information indicating the entire free recording area of the disk-shaped recording medium 10, and expresses this by setting a flag for each sector. FSD is the root of the hierarchical structure of the file system. The logical address and size of the FE for

The SMA 16 is a root Dir. FE of
Root Dir. BOS (Backup Of Space ma)
nagement file) FE, SMF (Space Management Fil)
This is the area where the FE and SMF entities of e) are placed.
The SMA 16 has a sub-Dir. F
E, a sub-Dir. Containing a FID that points to a file Is placed. That is, the FID and the FE of the directory are recorded together in the SMA 16.

The SMF is composed of two entities,
It is pointed to by AD [0] and AD [1] in F's FE, respectively. The first entity of SMF is AD [0]
This area is reserved for describing the logical address and size information of the area initially designated as the second entity of the SMF and indicated by. The second entity of the SMF is pointed to by AD [1], and is reserved for use for the FID and the FE of the directory created during the recording of data on the disc-shaped recording medium 10 after the formatting process. Area.

In this way, the SMF is divided into two entities, and the information about the initial location and size of the second entity is described in the first entity, so that the location and the route where the FE of the SMF is recorded are recorded. Dir. The SMA 16 can be defined regardless of the location where the FE is recorded. In addition, sub-Dir. Delete or root Dir. You can flexibly deal with the deletion of the files below.

In such an SMF, an unused area of the SMA 16 is secured in advance with a predetermined capacity at the time of formatting as a file having a specific attribute. SM unused area
By processing as a file as F, the above SB
In D, this unused area can be prevented from being recognized as an empty recording area.

Here, the root Dir. FE, Root Dir. The sector for storing the entity of SMF and the sector for storing the FE of SMF may be located anywhere in the SMA 16, but from the viewpoint of accessing these at high speed, it is desirable to record continuously as shown in FIG.

As already mentioned in the conventional example, FE indicates the logical address and size of the substance of the file or directory. This information is written by the AD in the FE.
The FID is the name of the file or directory and the F
F by ICB (Information Control Block) in ID
The logical address and size of E are shown.

The FSA 17 is an area in which the FE of the file and the actual data (data) of the file are placed, and B
The substance of the OS (actual data of BOS) is also placed here. B
The substance of the OS is a file for backing up the management information collectively recorded in the SMA 16, and the SM obtained by referring to the substance of AD [0] of the SMF.
It is a complete copy of A16. The BOS FE indicating the logical address and size of the BOS entity is recorded in the SMA 16 and backed up in the BOS entity.

In the FSA 17, it is preferable that the FE of the file and the actual data of the file corresponding to the FE are arranged consecutively in terms of address. When a file is added, it is preferable that the FEs of the file to be added are arranged consecutively in address to the existing file, and the data of the file are arranged consecutively in address. Thus, by arranging the FE of the file and the actual data of the file consecutively in terms of address, the file can be accessed at high speed.

Next, an example of a method of formatting the disc-shaped recording medium 10 will be described. The lead-in area 11 and the lead-out area 14 are, for example,
It is assumed that the disk-shaped recording medium 10 already exists before the formatting process, such as created in advance during the press process in the manufacturing process. The formatting process proceeds from the inner circumference side to the outer circumference side of the disc-shaped recording medium 10.

When the format process is started, AVDP is first written in a plurality of predetermined addresses,
The above-mentioned VRS, MVDS and LVIS are written from outside the lead-in area 11.

Next, a partition is created. In the partition, first, RSA15 is created, and F
SDS is written to the root Dir. The position of is determined. Then, the SBD is created. At this time, the SMF area is secured by setting the above-mentioned SMF area as a used area in the SBD.

When the SBD is created and the RSA 15 is created, then the SMA 16 is created from the outside of the RSA 15.

In creating the SMA 16, first, RSA
Based on the FSD written in 15, the route Dir. Sectors and roots that describe the FE of the Dir. Sectors that describe the substance of the are secured in succession, and the root Dir. The FE and entity of is written.

Root Dir. The entity of the parent Dir. FID, SMF FID and BOS FID. SMF FID
Specifies the location of the SMF FE and the BOS FID is
Specify the FE location of BOS.

At this time, the attributes of SMF and BOS are specified in each FID. SMF and BOS specified
The attributes of SMF and BOS are other devices and OS (Opera
tingSystem) to prevent erasing, rewriting, moving, etc. For example, “hidden file attribute” is designated as an attribute of SMF and BOS, respectively. The “hidden file attribute” is an attribute that makes it impossible to browse a file in which this attribute is set by a normal method.

Next, the FE of the BOS is created, and the AD that specifies the location and size of the BOS entity is placed here. Here, the size of the BOS entity is such a size that the BOS entity can completely copy the information of the SMA 16.

Next, the SMF FE is created. SMF
The FE of AD specifies AD [0] that specifies the location and size of the first entity in the file and AD [1] that specifies the location and size of the second entity in the file. It is equipped with.

Since the file exists just by designating the FE, the FE of BOS and the FE of SMF.
By creating, the area for placing the SMF entity and the area for placing the BOS entity are secured respectively.

Further, in each FE of BOS and SMF,
"Read-only file attribute" and "system file attribute" are designated respectively. The “read-only file attribute” is an attribute indicating that the file to which this attribute is set is read-only and that modification or deletion is prohibited by the system. "System File Attributes"
Is an attribute indicating that the file to which this attribute is set is a file necessary for the system. These 3
By designating these two attributes to BOS and SMF respectively, it is possible to prevent the BOS and SMF from being erased, rewritten, moved, or otherwise processed except for an intentional operation. Note that these attributes can be canceled by a well-known predetermined method.

Next, the root Dir. The first entity of the SMF is created so as to be contiguous to the sector that describes the entity of, and the initial logical address and size of the second entity of the SMF are described therein. That is, the logical address and size of the second entity of the SMF secured during the format processing are described in the first entity of the SMF. The format of this description is described in AD format in accordance with UDF, and in this specification, this pseudo AD is represented by [AD]. Then, the second entity of SMF is extended [A
Since there is a possibility that there are multiple D], in order to show this number, AED (Allocation Exten
t Descriptor) format. This pseudo AE
In the present specification, D is expressed as [AED].

As described above, by allowing the SMF to exist in the SMA 16, the empty area of the SMA 16 can be secured by the SMF. After the formatting process, the sub Dir. If the FE and entity of is written,
The area in the second entity of the SMF is deleted so that these sub-Dir. FEs and entities are created in SMA 16.

In this way, the SMA 16 is created.
The outside of SMA16 is FSA17. The BOS entity is created in the FSA 17 using a part thereof. B
The substance of the OS is actual data in which the management information for managing the hierarchical structure of the file system recorded in the SMA 16 is filed. That is, at the time of formatting, the substance of the BOS is the root Dir. FE, Root Dir. Of the BOS FE, the SMF FE, and the SMF entity. Is the parent Dir. FID, SMF FID and BOS
FID.

Then, the FSA excluding the real area of the BOS
Reference numeral 17 denotes an unused area, in which the actual data of the file is recorded after the formatting process. And FSA1
The RVDS is created by jumping over the area designated as 7. RVDS is created and the disc-shaped recording medium 1
The 0 format process is completed.

Next, after the formatting process, the sub Di
r. And how to add files.

First, the sub-Dir. 1, ..., Sub Di
r. A case where X, ... Is added will be described.

Root Dir. Sub-substance
Dir. The FID indicating 1 is added. At this time,
Root Dir. If there is a free space in the sector in which the entity is stored, the sector is added. on the other hand,
If there is no free space in the sector, after reducing the size of the area in the second entity of SMF,
The sub-Dir.
1 FID is added.

Next, the sub-Dir. Since the FE of 1 is added, the size of the area in the second entity of the SMF is reduced.

Next, the sub-Dir. One entity (eg,
Parent Dir. , And the child file FID), the size of the SMF in the second entity is further reduced.

Next, the AD [1] information in the FE of the SMF is updated to reflect the change in the size of the second entity of the SMF so far.

Next, the BOS substance is rewritten to reflect the change in the SMA 16. That is, SMA16
The content of is read and written as it is to the area allocated to the BOS entity. BOS is the root
Dir. FE, Root Dir. Of BOS, F of BOS
E, FE of SMF, entity pointed to by AD [0] of SMF, sub-Dir. 1 FE and sub-Dir. The root Dir. Is the parent Di
r. FID, SMF FID, BOS FID and sub-Dir. It consists of 1 FID and sub-Di
r. 1 is the parent Dir. FID and child file
Of the FID.

Such an operation is performed by the sub-Dir. 2, Sub-Dir. 3, ..., Sub-Dir. X, ...

In the above process, the contents of the BOS entity that backs up the contents of the SMA 16 are changed every time the contents of the SMA 16 are changed, but the present invention is not limited to this. The timing (timing) of changing the content of the BOS entity is calculated when the disc-shaped recording medium 10 is inserted into or removed from the drive device, after a predetermined fixed period of time elapses, and the FID added to the root / Dir entity is counted. It may be a predetermined number, for example, every three times, or a user's instruction.

On the other hand, in the above, the case of adding a directory has been described, but in the case of adding a file,
It will be as follows.

Root Dir. The FID indicating the new file is added to the entity. At this time, the root Dir. If there is a free space in the sector in which the entity is stored, the sector is added. On the other hand, when there is no free space in the sector, the size of the area in the second entity of the SMF is reduced, and then the FID of the new file is added to the empty area due to the reduction.
In this case, since the size of the second entity of the SMF is changed, the AD-1 information in the FE of the SMF is updated. Next, the FE of the new file is FSA1
7 areas are added. Next, the substance of the new file is FS
It is added to the area of A17. Thus the file FE
And the entity is located in FSA17.

As a result of such an operation, the new file is the root Dir. The information about the new file added below and the added new file will be recorded together in the SMA 16 together with the information about the already recorded directory.

By the way, for example, the route Dir. Below many sub-Dir. Or a new file is added, the root Dir. FID in the entity of the sub Dir. FE, Sub-Dir. A large number of FIDs of new files in the entity of will be added. As a result, SM is added by the added FE and FID.
It is possible that A16 will be full.

In such a case, if there is a free space in the FSA 17, the free space is used to allocate the FSA 17 to a plurality of SMA areas, so that S
A second SMA 16-2, which is an expanded area of the MA 16, and a second FSA 17-2, which corresponds to an FSA for recording data, are newly created outside the position where the file exists in the FSA 17.

Next, the sub-Dir. The operation of backing up the FE of a file when a file is created will be described.

FIG. 2 is a schematic diagram for explaining the structure of the SMA and FSA before making a backup for the file entry of the child file.

FIG. 3 is a diagram showing a file identification descriptor.

FIG. 4 is a schematic diagram for explaining how to make a backup for a file entry of a child file.

FIG. 5 is a diagram showing a format of implementation use.

In FIG. 2, FIG. 2 is a schematic diagram in which recording areas arranged concentrically or spirally on the disk-shaped recording medium 10 are expressed linearly, and FIG. 2A is mainly an SM.
2A represents FSA17.

In the disc-shaped recording medium 10 shown in FIG.
By the above-mentioned operation, the route Dir. A plurality of sub-Dir. Is created and the sub-Dir. Under the sub-Dir. Or file is created. For example, a plurality of sub-Dir. Sub-Dir. X is the root Dir. Created under the sub-Dir. A child file (child File) is created in X.

Sub-Dir. 2A is created, the SMA 16 returns to the root D as shown in FIG. 2A.
ir. FE, Root Dir. Of BOS, F of BOS
E, SMF FE, SMF AD [0] entity, a plurality of sub-Dir. FE, these sub-Dir. The entity of
The entity of AD [1] of SMF is recorded. Route Di
r. Is the parent Dir. FID, SMF FID,
BOS FID and multiple sub-Dir. Of the FID.

As shown in FIG. 2B, the FSA 17 is composed of the substance of the BOS, the FE of the file, the actual data of the file, and an empty recording area (a recording area in which substantially meaningful information is not recorded). It For example, sub-Dir. The location of the FE of the child file in X is sub-Dir. I of the FID of the child file in the entity of X
AD in FE of this child file stored in CB
The location of the actual data of the child file is stored in [0].

In UDF, as shown in FIG. 3, the FID is a descriptor tag (Descriptor Tag), a file version number (File Version Number), a file character (File Characteristics), and a length of file identifier (Length Of File Identifie).
ier), an ICB, a length of implementation use, an implementation use, a file identifier, and padding.

The details will be given to the UDF standard, but to be briefly explained, the Descriptor Tag is an identifier for identifying the descriptor, and the Desc
It is determined whether it is a riptor. File Version Number is
The version number of the file. FileCharacteristics is a file attribute such as whether it is a hidden file or a directory. Length Of File Identifier
Is the size (length) of the file ID. ICB is
As described above, the logical address and size of FE are stored. Length Of Implementation Use is the size of implementation use. Implementation Use
Will be described later. File Identifier is an identifier of a file. Since the FID has a variable length, the padding is inserted to arrange the FID into an integral multiple of 4 bytes.

Then, as shown in FIG. 4, BFE (Backupped File Entr) for backing up the FE of the child file
y) is created in FSA17. The BFE which is a spare is created at the time when the FE of the regular child file is created.

In FIG. 4, the BFE is recorded following the actual data pointed to by the BFE.
The data may be recorded in any of the seven recording areas.

The BFE has the same contents as the FE to be backed up, and the logical address and size of the actual data of the child file to be backed up are stored in AD [0] thereof.

The Implementation Use in the FID of the child file is extended to indicate the BFE.

Implementation Use is, as shown in FIG. 5, Flag, Identifier, OS Class, OSIdentifier, Impl.
ementation Use Area and Logical Block Number Of B
Composed of ackupBFE.

Flag, Identifier, OS Class, OS Identif
ier and Implementation Use Area are based on the UDF standard, and Logical Block Number Of Backup BFE
Is an expanded part in this embodiment.

Details will be given to the UDF standard, but briefly explained. The OS Class and the OS Identifier are used in association with each other, and the operating system (the entire device including the drive device) is operating. OS).
The Implementation Use Area is an area that the implementation can use freely.

Logical Block Number Of Backup BFE
Stores the location of the BFE that backed up the regular FE, and this location is indicated by the logical block number.

The Logical Block Nu is also used for the implementation use of the FID of the child file in the body of the BOS.
mber Of Backup BFE is described.

The UDF standard is, for example, OST.
A (Optical Storage Technology Association) home page (http://www.osta.org/html/ostaudf.html)
It is open to everyone and can be downloaded from this homepage.

Next, the recovery operation when the FE of the regular child file placed in the FSA 17 cannot be read will be described.

FIG. 6 is a schematic diagram for explaining the processing for recovering the file entry of the child file in which the failure has occurred.

FIG. 6 is a schematic diagram in which recording areas arranged concentrically or spirally on the disk-shaped recording medium 10 are linearly expressed, and FIG. 6A mainly shows the SMA 16.
FIG. 6B represents FSA17.

In FIG. 6, the sub-Dir. FID of X
Is the root Dir. Placed in the entity of this sub Di
r. Sub Dir. The FE of X is indicated. This sub-Dir. Sub-by FE of X
Dir. The entity of X is pointed. Sub-Dir. The entity of X is the parent Dir. FID, child file FID, ...
The FE of the child file is indicated by the ICB in the FID of the child file.

In such a case, if the FE of the child file cannot be read due to a failure, Implementation refers to Implementation Use in the FID of the child file.

Next, the Implementation is the Implementation
The Logical Block Number of Backup BFE of Use is checked, and the logical block number of the spare BFE is acquired.

Next, the Implementation refers to the BFE from the logical block number of the BFE and sets its contents in the FSA17.
The FE is restored as the FE of the regular child file by copying it to the empty recording area of.

Next, the Implementation rewrites the contents of the ICB in the FID of the child file in the SMA 16 so as to point to the FE of the restored child file.

Next, the Implementation rewrites the contents of the FID of the child file in the substance of the BOS in the SFA 17 to reflect the rewriting of the contents of this ICB.

As a result, the FE of the restored child file
A new link is created, the FE of the restored child file is referenced from the FID of the child file, and the actual data of the child file can be read. And the FI of the child file
Even if some failure occurs in D, the FID of the child file is restored by referring to the FID of the child file in the body of BOS, and the FID of the restored child file is the FE of the restored child file. I will point you.

Further, when the FE of the regular child file cannot be read, the FE of the regular child file is restored using the spare BFE each time, so unless both FEs cannot be read at the same time. , The actual data of the file can be read.

Here, when there are a plurality of files, a plurality of BFEs also exist correspondingly, but these BFEs may be handled as one file. In this case, the FID of this BFE file is the root Dir. FE that is created in the entity of and that points to these BFEs is created in the SMA 16. BFE like this
However, an operating system that does not support BFE cannot use the function of backing up the FE of a file, but treats the disc-shaped recording medium 10 as a recording medium according to a general UDF. You can When setting the file attribute of BFE, "hidden file attribute" is specified in the FID of BFE, and "read-only file attribute" and "system file attribute" are specified in FE of BFE.

Next, a drive device applicable to the present invention will be described.

FIG. 7 is a diagram showing the configuration of an example of the drive device.

Here, the disc-shaped recording medium 1 described above is used.
0 is a recording medium using a phase change metal material for the recording layer,
The drive device 50 controls the temperature applied to the recording layer by adjusting the output of the laser to change the state to crystalline / amorphous by the phase change technique.
Data is recorded at 0.

In FIG. 7, a drive device 50 includes a spindle motor 51, an optical pickup 52, a laser driver 53, a recording equalizer 54, and a buffer memory 5.
5, encoder / decoder circuit 56 (hereinafter referred to as "ENC /
It is abbreviated as "DEC circuit". ) 56, thread mechanism 57,
RF signal processing circuit 58, address extraction 59, drive control microcomputer 60, interface (hereinafter, “I / F”)
Is abbreviated. ) 61, servo circuit 62 and memory 63
It is configured with.

The spindle motor 51 rotationally drives the chucked disk-shaped recording medium 10, and the rotational speed is servo-controlled by the servo circuit 62.

Recording and reproduction of data with respect to the disc-shaped recording medium 10 are performed by the optical pickup 52. The optical pickup 52 is sled transferred by the sled mechanism 57 in the radial direction of the disc-shaped recording medium 10.

Data from the external digital device 71 is transferred to the I / F 61, for example, SCSI (Small Computer System).
It is supplied to the drive device 50 via the stem interface). Here, the digital device 71 may be any digital device as long as it is capable of inputting / outputting a digital signal and having an appropriate interface, for example, a personal computer, a portable digital video recorder with a camera, a digital still camera and a mobile phone. Etc., and may be incorporated in these devices.

The I / F 61 has an ENC / DEC circuit 56.
And drive control microcomputer are connected, ENC / DE
A buffer memory 55, a recording equalizer 54, an RF signal processing circuit 58, a servo circuit 62, and a drive control microcomputer 60 are connected to the C circuit 56.

The memory 55 is a buffer memory for holding write data or read data. The write data is sent from the digital device 71 to the E via the I / F 61.
It is supplied to the NC / DEC circuit 56. The ENC / DEC circuit 56 generates data in the above-mentioned format at the time of recording, and thereafter encodes the data according to the format. Then, the ENC / DEC circuit 56 performs a decoding process at the time of reproduction and outputs digital data to the digital device 71 via the I / F 61.

The address is added as a subcode in the ENC / DEC circuit 56, for example, and is also added to the header in the data.

The data from the ENC / DEC 56 is supplied to the laser driver 53 via the recording equalizer 54. The laser driver 53 generates a drive waveform having a predetermined level necessary for recording data on the disc-shaped recording medium 10. The output of the laser driver 53 is supplied to the laser in the optical pickup 52, and laser light having an intensity corresponding to the output is applied to the disc-shaped recording medium 10 to record data. Further, the laser driver 53 uses the APC (A
utomatic Power Control), as described above,
The intensity of laser light is appropriately controlled.

On the other hand, the signal generated by the optical pickup 52 due to the return light from the disc-shaped recording medium 10 is RF.
It is supplied to the signal processing circuit 58. Address extraction circuit 59
Extracts address information based on the signal supplied from the RF signal processing circuit 58. The extracted address information is supplied to the drive control microcomputer 60.

Further, the RF signal processing circuit 58 generates a tracking error signal TE and a focus error signal FE by the matrix amplifier calculating the detection signal of the photodetector in the optical pickup 52.
Tracking error signal TE, focus error signal F
E is supplied to the servo circuit 62.

The drive control microcomputer 60 uses addresses to control the seek operation, and uses control signals to control laser power. Drive control microcomputer 6
0 is a CPU (Central Processing Unit), a RAM (Rand)
om Access Memory) and ROM (Read Only Memory), etc., and includes I / F 61, ENC / DEC circuit 56, R
It controls the entire drive such as the F signal processing circuit 58 and the servo circuit 62. Therefore, the drive control microcomputer 60
Is the sub-Dir. The various processes described above are performed when adding / deleting files and adding / deleting files. Further, the memory 63 can be connected to the drive control microcomputer 60.

Further, the RF signal obtained by reproducing the disc-shaped recording medium 10 is supplied to the ENC / DEC circuit 56, and the ENC / DEC circuit 56 demodulates the modulation process performed at the time of recording and outputs the error correction code. Decoding according to a predetermined format such as decoding (that is, error correction) is performed. The ENC / DEC circuit 56 stores the reproduction data in the buffer memory 55, and the digital device 71
Upon receiving a read command from, the read data is transferred to the digital device via the I / F 61.

The frame synchronizing signal from the RF signal processing circuit 58, the tracking error signal TE and the focus error signal FE, and the address information from the address extracting circuit 59 are supplied to the servo circuit 62. The servo circuit 62 includes a tracking servo and a focus servo for the optical pickup 52 and a spindle motor 51.
And a sled servo for the sled mechanism 57.

In the above description, the disc-shaped recording medium 10 is used.
Format data for the ENC / DEC circuit 56
However, this is not limited to this example. Format data is the drive control microcomputer 6
Can be generated with 0. Further, the format data may be supplied from the digital device 71.

In the above description, the case where the present invention is applied to a drive device of a rewritable rewritable disc-shaped recording medium such as an optical disc drive device or a magneto-optical disc drive device has been described. The present invention is applicable without being limited to this. The present invention relates to a recording medium drive device, in which data recorded on a recording medium is managed by predetermined management information existing on the recording medium,
For example, it is also applicable to a fixed drive device such as a hard disk drive device.

[0109]

As described above, according to the present invention, since the information indicating the location where the actual data of the file is recorded is double recorded, the security of such information can be improved.

In the present invention, the preliminary information is used when the regular information is unreadable due to a failure or the like.
It is possible to newly restore the legitimate information on the recording medium.
Therefore, even if the regular information cannot be read, the actual data of the file can be read.

Further, according to the present invention, when the regular information cannot be read, the regular information is restored each time using the preliminary information. Therefore, except when the regular information and the preliminary information cannot be simultaneously read, the file Actual data can be read.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a logical format of a disc-shaped recording medium in association with a disc shape.

FIG. 2 is a schematic diagram for explaining a structure of SMA and FSA before creating a backup for a file entry of a child file.

FIG. 3 is a diagram showing a file identification descriptor.

FIG. 4 is a schematic diagram illustrating creation of a backup for a file entry of a child file.

FIG. 5 shows an implementation of the present embodiment.
It is a figure which shows the format of a youth.

FIG. 6 is a schematic diagram for explaining a process for recovering a file entry of a child file in which a failure has occurred.

FIG. 7 is a block diagram showing a configuration of an example of a drive device.

[Explanation of symbols]

10 Disk Recording Medium 15 Reserved Space Area 16 Space Management Area 17 Free Space Area 21 Root Directory File Entry 22 Root Directory Entity 23 Space Management File File
entry

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G11B 27/00 G11B 27/00 DF term (reference) 5B082 DC02 5D044 CC04 DE37 DE52 DE62 DE73 5D090 AA01 BB04 CC14 DD01 FF24 FF27 GG36 5D110 AA17 DA07 DB13 DB19

Claims (5)

[Claims] 1. A recording method for recording data in a recording medium based on a hierarchical file system, wherein management information for managing a hierarchical structure of a file system is recorded in a specific area of the recording medium, The unused area is treated as a special file, and the information indicating the location where the actual data of the file is recorded is dually recorded on the recording medium as the regular information and the spare information, and the size of the special file is reduced. By doing so, the designated information indicating the place where the regular information and the preliminary information are recorded is recorded in the vacant portion in the specific area. 2. The recording method according to claim 1, wherein when the regular information becomes unreadable, the preliminary information is used to restore the regular information to the recording medium. 3. The entire specific area is copied to another area as it is, and the entire copied specific area is treated as one backup file. When a part of the management information cannot be read, the backup file By using the data corresponding to the part of the inside, by reducing the size of the special file, it is possible to restore a part of the management information that can not be read to the empty part generated in the specific area The recording method according to claim 1, wherein: 4. The information about the initial location and size of the special file and the information about the current location and size of the special file are recorded in the specific area. The recording method described in 1. 5. A recording apparatus for recording data on a recording medium based on a hierarchical file system, means for recording management information for managing a hierarchical structure of a file system in a specific area of the recording medium, Means for treating an unused area as a special file, means for dually recording information indicating a location where the actual data of the file is recorded on a recording medium as regular information and auxiliary information, A recording device comprising: means for recording designation information indicating a location where the regular information and the preliminary information are recorded in a portion vacated in the specific area by reducing the size.