Data recording apparatus and data recording method

• US 20050149493A1
• Filed: 01/05/2005
• Published: 07/07/2005
• Est. Priority Date: 01/07/2004
• Status: Abandoned Application

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Kato, Yuichi, Yamashita, Kazuhiko
• Application Number:
  US11/028,614
• Publication Number:
  US 20050149493A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 11/1435 using file system or storage system metadata
• CPC Class Codes: G06F 16/10 File systems; File servers

Abstract

A data recording apparatus is provided with a recording medium. In addition, the data recording apparatus is provided with a file data list management unit and a file index list management unit. The file data list management unit receives file data constituting a plurality of files, on a file-by-file basis, and then records the received file data to the recording medium. Upon completion of the recording of the file data to the recording medium, the file index list management unit generates specification information associated with the files to which the received file data relates. The file index management unit then records the generated specification information to the recording medium 107.

Claims

1. A data recording apparatus having a recording medium, for accessing files on the recording medium with reference to specification information used for specifying storage locations of the files, comprising:

a data receiving unit operable to receive file data constituting a plurality of files, on a file-by-file basis;

a data recording unit operable to record the received file data onto the recording medium; and

a specification information recording unit operable to, on completion of the recording of the received file data, generate and record to the recording medium specification information for the files constituted of the received file data.

2. The data recording apparatus according to claim 1, wherein

the recording medium stores (i) file data constituting files being a pre-update version of the files constituted of the received file data, and (ii) specification information for the pre-update version of files, and

the specification information recording unit invalidates the previously stored specification information, and validates the specification information generated on completion of the recording of the received file data.

3. The data recording apparatus according to claim 2, further comprising:

a storage location recording unit operable to, each time the recording of the received file data is completed for one file, generate and record to the recording medium a piece of storage location information showing a storage location of the file, an access to the file being made with reference to the storage location information, wherein

the specification information specifies a storage location of each piece of storage location information, and

the specification information recording unit generates the specification information, on completion of the recording of the storage location information for the files constituted of the received file data.

4. The data recording apparatus according to claim 3, wherein

the recording medium includes:

a file data recording area composed of a plurality of clusters; and

a table recording area storing a cluster usage table showing a usage condition of the clusters, and

the data recording unit includes;

a cluster specifying subunit operable to specify, with reference to the cluster usage table, unused clusters available for storing the received file data;

a cluster recording subunit operable to record the received file data to the specified clusters;

an updated table generating subunit operable to generate a cluster usage table in which a usage condition of the specified clusters is updated; and

a table update subunit operable to record the generated cluster usage table to the recording medium, on completion of the recording of the storage location information for the files.

5. The data recording apparatus according to claim 4, further comprising:

a group file specifying unit operable to specify a plurality of files to be updated as a group, wherein

the data receiving unit receives the file data for the specified group of files.

6. A data recording method for use by a data recording apparatus having a recording medium and accessing files on the recording medium with reference to specification information used for specifying storage locations of the files, the data recording method comprising the steps of:

receiving file data constituting a plurality of files, on a file-by-file basis;

recording the received file data onto the recording medium; and

generating and recording to the recording medium, on completion of the recording of the received file data, specification information for the files constituted of the received file data.

7. A program for use by a data recording apparatus having a recording medium and accessing files on the recording medium with reference to specification information used for specifying storage locations of the files file, the program comprising:

code operable to cause the apparatus to receive file data constituting a plurality of files, on a file-by-file basis;

code operable to cause the apparatus to record the received file data onto the recording medium; and

code operable to cause, on completion of the recording of the received file data, the apparatus to generate and record to the recording medium specification information for the files constituted of the received file data.

8. A computer-readable recording medium storing a program for used by a data recording apparatus having another recording medium and accessing files on said another recording medium with reference to specification information used for specifying storage locations of the files, the program comprising:

code operable to cause the apparatus to receive file data constituting a plurality of files, on a file-by-file basis;

code operable to cause the apparatus to record the received file data onto the recording medium; and

code operable to cause, on completion of the recording of the received file data, the apparatus to generate and record to the recording medium specification information for the files constituted of the received file data.