Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2001-07-20
2004-07-13
To, Doris H. (Department: 2655)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S030040, C707S793000, C707S793000
Reexamination Certificate
active
06762984
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a data storage medium to which files managed using a volume/file structure are recorded and reproduced, and in which the number of data recording operations to any same area is limited, and to a data recording and reproducing method and data recording and reproducing apparatus using this data storage medium. More particularly, the present invention relates to a data storage medium wherein start address information for integrity information indicative of a volume status is located outside the volume space, and to a data recording and reproducing method and a data recording and reproducing apparatus which use this data storage medium.
BACKGROUND ART
While media of various types have been used in recent years for recording digital data, CD-R discs in particular have quickly become commonly used as a low-cost recordable optical disc medium. The multi-session method is now well known as a technique for appending data to these CD-R discs; a data recording operation using this multi-session method is described next below with reference to the accompanying figures.
FIG. 15
shows the data structure of a CD-R disc to which files managed using the volume/file structure defined in the ISO 9660 standard are recorded using a multi-session method. In a multi-session recording method, files and volume/file structure for managing the files are recorded in session units. Each session has a lead-in area, an inner link area, a user data area, and a lead-out area. It is to be noted that only the first session does not have a lead-in area. In addition, an outer link area is formed between sessions.
When recording data by session unit, a file and volume/file structure for managing the file are first recorded to the user data area. The lead-out area is then recorded. This lead-out area is recorded to make data reproduction easier on a CD-ROM drive which is unable to detect a location in an unrecorded data area on a CD-R disc because it is unable to detect the wobble address recorded to the CD-R disc. Data indicative of the address for a next session or user data area is then recorded to the lead-in area. A run-in block and run-out block are additionally recorded at the beginning and end of each area when recording to the user data area, lead-in area, or lead-out area. The run-in and run-out blocks are also partially overwritten on disc, and these overwritten areas are referred to as link blocks. An inner link area comprising a run-out block, link block, and run-in block is thus formed between a lead-in area and user data area and between a user data area and lead-out area, and an outer link area having the same configuration is formed between a lead-out area and lead-in area.
FIG. 16
shows the directory structure used for managing files recorded to a CD-R disc in conjunction with the data structure shown in FIG.
15
. The directory structure shown in
FIG. 16
has a subdirectory (Dir-A) for managing a data file (File-a), a subdirectory (Dir-B) for managing a data file (File-b), and a subdirectory (Dir-C) for managing a data file (File-c) below the root directory. When data file (File-a), data file (File-b), and data file (File-c) are sequentially recorded during a first session, second session, and third session in accordance with this directory structure, the data structure described above with reference to
FIG. 15
is formed on the CD-R disc.
FIG. 17
is a flow chart describing a recording operation for forming the data structure shown in
FIG. 15
on a disc. The data recording operation performed each session is described next below according to the steps shown in this flow chart.
(Step S
1701
) When a CD-R disc is inserted into the disk recorder, the disk recorder accesses the lead-in area reserved at a specific location at the inside circumference of the disc, and attempts to read the TOC data from this lead-in area. This TOC data is a table of contents for the data recorded on the data storage medium. If the TOC data is reproduced from the lead-in area, a step (S
1702
) for retrieving the following session data is performed. However, if the data could not be reproduced because the lead-in area is unrecorded, the session data recording operation is performed according to the procedure beginning in step (S
1703
).
(Step S
1702
) If the TOC data is reproduced from the lead-in area, the disk recorder reads the start address of the following session contained in this TOC data, returns to step (S
1701
), and then tries to reproduce data from the lead-in area of the following session.
(Step S
1703
) When a lead-in area to which no data is recorded is detected, the file recorded as the session data and the volume/file structure for managing said file are generated as follow.
First, when data is not reproduced from the first lead-in area, the data file (File-a) to be recorded as the data for the first session, subdirectory (Dir-A) for managing data file (File-a), a directory file for managing the root directory, and volume/file structure, such as a primary volume descriptor and path table, for managing these files and the directory file, are generated according to the ISO 9660 standard.
If TOC data is reproduced from the first lead-in area, the volume/file structure and directory file are read using the user data area start address contained in the last read TOC data. For example, with a disc to which only a first session has been recorded, data is read from user data area
1502
; with a disc that has been recorded from a first session to a second session, data is read from user data area
1505
. The content of the volume/file structure is then updated by adding the file newly recorded to the read data and a directory file for managing said file. For example, data file (File-b) and the directory file (Dir-B) of the subdirectory for managing data file (File-b) are added to the data read from user data area
1502
on a disc to which only a first session has been recorded, and a new volume/file structure is then generated; data file (File-c) and the directory file (Dir-C) of the subdirectory for managing data file (File-c) are added to the data read from user data area
1505
on a disc to which a second session has also been recorded, and a new volume/file structure is then generated.
(Step S
1704
) When the volume/file structure to be recorded to a user data area is generated, a lead-in area and run-out block of predetermined recordingsize are skipped, and the recording data generated in step (S
1703
) to which a predefined link block/run-in block and link block/run-out block have been added therebefore and thereafter is continuously recorded.
(Step S
1705
) When data recording to the user data area is completed, recording data having a predefined link block/run-in block and link block/run-out block added before and after the data recorded to the lead-out area is generated. The resulting recording data is then recorded continuously from the link block following the run-out block recorded in step (S
1704
). When recording the first session, for example, this operation records lead-out area
1503
and the link block/run-in block and run-out block/link block located therebefore and thereafter. When recording a second session, this operation records lead-out area
1506
and the link block/run-in block and run-out block/link block located therebefore and thereafter.
(Step S
1706
) When data recording to the lead-out area is completed, the start address of the next session is calculated with consideration for the predetermined recordingsize of the outer link area. The calculated start address of the next session is then embedded in the TOC data recorded to the lead-in area together with the start address for the user data area recorded in step (S
1704
).
Recording data comprising predefined link block/run-in block and run-out block/link block units before and after the recording data for the lead-in area is then generated. The resulting recording data is then recorded continuously from a specific position at the inside circumference of the disk if the first s
Fukushima Yoshihisa
Goto Yoshiho
Sasaki Miyuki
Ortiz-Criado Jorge L
To Doris H.
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