Information recording medium and region management method for a plurality of recording regions each managed by independent file system
First Claim
1. A region management method of an information recording medium, the information recording medium having a data recording region for storing data and a command receiver, the data stored in the recording medium being managed as a file by a file system, the region management method comprising:
- dividing the data recording region into a plurality of recording regions each managed by different file systems individually;
receiving a changeover command and a data read/write command, for the command receiver, from outside of the information recording medium, the changeover command specifying a region accessible from outside of the information recording medium and the data read/write command specifying a size and an offset of a region to be accessed; and
selecting one of the divided recording regions according to the received changeover command, as a region accessible from outside of the information recording medium,wherein a changeover to a different divided recording region occurs under a control of the received changeover command,wherein a plurality of independent file systems areas are disposed on the information recording medium, and the information recording medium is interpreted by different devices having different file systems, wherein data interchangeability between the different devices is provided, andwherein, when a region defined by the size and the offset specified by the data read/write command received from outside of the information recording medium exceeds the selected recording region, access to the region specified by the data read/write command is rejected.
2 Assignments
0 Petitions
Accused Products
Abstract
A region management method for an information recording medium capable of maintaining data interchangeability among devices and preventing malfunction when one information recording medium shared among devices different in type or number of file systems that can be interpreted by devices is provided. A recording region of the information recording medium is divided into a plurality of regions, and region information such as position and size of each region is held in the information recording medium. Different file systems are constructed in individual data recording regions. In response to a command from an information processing apparatus, accessible regions by the information processing apparatus are changed over by, for example, referring to validity flag information that indicates a presently valid region.
-
Citations
22 Claims
-
1. A region management method of an information recording medium, the information recording medium having a data recording region for storing data and a command receiver, the data stored in the recording medium being managed as a file by a file system, the region management method comprising:
-
dividing the data recording region into a plurality of recording regions each managed by different file systems individually; receiving a changeover command and a data read/write command, for the command receiver, from outside of the information recording medium, the changeover command specifying a region accessible from outside of the information recording medium and the data read/write command specifying a size and an offset of a region to be accessed; and selecting one of the divided recording regions according to the received changeover command, as a region accessible from outside of the information recording medium, wherein a changeover to a different divided recording region occurs under a control of the received changeover command, wherein a plurality of independent file systems areas are disposed on the information recording medium, and the information recording medium is interpreted by different devices having different file systems, wherein data interchangeability between the different devices is provided, and wherein, when a region defined by the size and the offset specified by the data read/write command received from outside of the information recording medium exceeds the selected recording region, access to the region specified by the data read/write command is rejected. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A region management method of an information recording medium, the information recording medium having a data recording region for storing data and a command receiver, the data stored in the recording medium being managed as a file by a file system, the region management method comprising:
-
dividing the data recording region into a plurality of recording regions each managed by different file systems individually; storing a plurality of storage blocks in a consecutive recording region in the information recording medium, the storage block having constant data size, each storage block storing a partition table which is provided to each divided recording region and is information about a region management which is used by each file system of each divided region; storing a valid block number indicating a storage block which includes the partition table for a region in the divided recording regions that is accessible from outside of the recording medium; receiving a changeover command and a data read/write command, for the command receiver, from outside of the information recording medium, the changeover command specifying a valid block number and the data read/write command specifying a size and an offset of a region to be accessed; and according to the received changeover command, referring to the valid block number, selecting one storage block from the plurality of storage blocks, and determining a partition table for a region to be accessible from outside of the information recording medium, wherein a changeover to a different divided recording region occurs under control of the received changeover command, wherein a plurality of independent file systems areas are disposed on the information recording medium, and the information recording medium is interpreted by different devices having different file systems, wherein data interchangeability between the different devices is provided, and wherein, when a region defined by the size and the offset specified by the data read/write command received from outside of the information recording medium exceeds the recording region related to the determined partition table, access to the region specified by the data read/write command is rejected. - View Dependent Claims (7, 8, 9)
-
-
10. An information recording medium, comprising:
-
a data recording region which is divided into a plurality of regions, a different file system for managing data stored in each region being constructed in each divided region; a command receiver for receiving a changeover command and a data read/write command from outside of the information recording medium, the changeover command specifying a region accessible from outside of the information recording medium and the data read/write command specifying a size and an offset of a region to be accessed; a region information storage that stores a validity flag showing a region in the divided plurality of regions accessible from an external device; and an access region judger that selects one valid region by referring to the validity flag and allows access to the selected one valid region by the external device, wherein a changeover to a different divided recording region occurs under a control of the received changeover command, wherein a plurality of independent file systems areas are disposed on the information recording medium, and the information recording medium is interpreted by different devices having different file systems, wherein data interchangeability between the different devices is provided, and wherein, when a region defined by the size and the offset specified by the data read/write command received from outside of the information recording medium exceeds the region shown by the validity flag, the access region judger rejects access to the recording region specified by the data read/write command.
-
-
11. An information recording medium having a data recording region for recording data, wherein
a) the data recording region is divided into a plurality of recording regions each managed by a different file system, and b) the information recording medium includes: -
a partition table storage that stores a plurality of storage blocks for storing a partition table which is information about a region management used by the file system in each divided region, a command receiver that receives a changeover command and a data read/write command from outside of the information recording medium, the changeover command specifying a valid block number and the data read/write command specifying a size and an offset of a region to be accessed, a region information storage that stores a valid block number indicating a storage block of the plurality of storage blocks in the partition table storage, the storage block including the partition table which is accessible from an external device, and an access region judger that selects one storage block from the partition table storage with reference to the valid block number, and determines the partition table which is accessible from the external device, on the basis of the changeover command received from outside of the information recording medium, wherein a plurality of independent file systems areas are disposed on the information recording medium, and the information recording medium is interpreted by different devices having different file systems, wherein data interchangeability between the different devices is provided, and wherein, when a region defined by the size and the offset specified by the data read/write command received from outside of the information recording medium exceeds the region related to the determined partition table, the access region judger rejects access to the region specified by the data read/write command.
-
-
12. A region management method of an information recording medium having a data recording region for storing data, the data stored in the recording medium being managed as a file by a file system, the region management method comprising:
-
receiving a changeover command and a data read/write command, for a command receiver, from outside of the information recording medium, the changeover command specifying a type of size of a data recording region accessible from outside of the information recording medium and the data read/write command specifying a size and an offset of a region to be accessed; storing a plurality of types of sizes of the data recording region accessible from outside of the information recording medium; and changing over a size of an accessible region according to the changeover command received from outside of the information recording medium, wherein a plurality of independent file systems areas are disposed on the information recording medium, and the information recording medium is interpreted by different devices having different file systems, wherein data interchangeability between the different devices is provided, and wherein, when a region defined by the size and the offset specified by the data read/write command received from outside of the information recording medium exceeds the accessible region, access to the region specified by the data read/write command is rejected. - View Dependent Claims (13, 14, 15, 16)
-
-
17. An information recording medium having a data recording region for recording data, comprising:
-
a region information storage that stores a plurality of types of sizes of the data recording region accessible from outside of the information recording medium, and valid region information which is information indicating the size which is presently valid in a plurality of types of sizes of data recording regions accessible from outside of the information recording medium; a command receiver for receiving a changeover command and a data read/write command from outside of the information recording medium, the changeover command specifying a type of a size of a data recording region accessible from outside of the information recording medium and the data read/write command specifying a size and an offset of a region to be accessed; and an access judger that, prior to accessing the data recording region in the information recording medium, recognizes a size of an accessible region by referring to the valid region information, and judges possibility of access, wherein a changeover to a different type of size of the data recording region occurs under a control of the received changeover command, wherein a plurality of independent file systems areas are disposed on the information recording medium, and the information recording medium is interpreted by different devices having different file systems, wherein data interchangeability between the different devices is provided, and wherein, when a region defined by the size and the offset specified by the data read/write command received from outside of the information recording medium exceeds the accessible region, the access region judger rejects access to the region specified by the data read/write command. - View Dependent Claims (18)
-
-
19. A region management method of an information recording medium having a data recording region for storing data, the data stored in the recording medium being managed as a file by a file system, the region management method comprising:
-
storing information providing size of data recording region to a specific register; receiving a changeover command and a data read/write command, for a command receiver, from outside of the information recording medium, the changeover command specifying information providing size of a data recording region accessible from outside of the information recording medium and the data read/write command specifying a size and an offset of a region to be accessed; setting the information providing size of data recording region in the register simultaneously with initialization of the information recording medium to a specific value smaller than an actual size of the data recording region; and setting, according to the changeover command received from outside of the information recording medium, the information providing size of the data recording region in the register to an actual size of the information recording medium, wherein a plurality of independent file systems areas are disposed on the information recording medium, and the information recording medium is interpreted by different devices having different file systems, wherein data interchangeability between the different devices is provided, and wherein, when a region defined by the size and the offset specified by the data read/write command received from outside of the information recording medium exceeds the data recording region of which size is provided by the information stored in the register, access to the region specified by the data read/write command is rejected. - View Dependent Claims (20, 21)
-
-
22. An information recording medium having a data recording region for recording data, comprising:
-
a register that stores information providing size of data recording region to a specific register; a command receiver that receives a changeover command and a data read/write command from outside of the information recording medium, the changeover command specifying information providing a size of a region accessible from outside of the information recording medium and the data read/write command specifying a size and an offset of a region to be accessed; and an access region judger that sets the information providing size of data recording region in the register simultaneously with initialization of the information recording medium to a specific value smaller than an actual size of the data recording region, and sets, according to the changeover command received from outside of the information recording medium, the information providing size of data recording region in the register to an actual size of the information recording medium, wherein a plurality of independent file systems areas are disposed on the information recording medium, and the information recording medium is interpreted by different devices having different file systems, wherein data interchangeability between the different devices is provided, and wherein, when a region defined by the size and the offset specified by the data read/write command received from outside of the information recording medium exceeds the data recording region of which size is provided by the information stored in the register, access to the region specified by the data read/write command is rejected.
-
Specification