JPS62109280A - Recording and reproducing system for postscript type storage device - Google Patents

Abstract

PURPOSE:To record all of bits of management information in a file of large capacity and to reduce an access time in a short time by recording bits of data management information fractionating them into segments when the bits of management information in plural files of large capacity are recorded and reproduced. CONSTITUTION:When a recording is performed, a data, the bit of management information of the data, and a bit of segment management information are fetched in a central processing part 2 through an input device 1, and the data is stored at the data storage area 7a of a postscript type storage medium. When the bit of data management information is a new file, one of segments at a management information storage area 7b is allocated and given to it, and the capacity of the bit of data management information stored within the bit of administration information of the segment is stored at a memory 3. Next, the bit of segment management information within the memory 3 is stored at a segment management area 7c, and also, the memory 3 is updated. And a disc controller 4 issues an instruction to a disc drive device 5 by a command from the central processing unit 2 and the bit of data management information is recorded with the said segment of the management information storage area 7b.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording/reproducing method in a write-once storage device, and more particularly to a recording/reproducing method for management information of a plurality of large-capacity files.

BACKGROUND OF THE INVENTION Conventionally, as shown in Fig. 1, this type of device consists of a device (IN) 1 for inputting data such as document images and management information, and a central processing unit (CPU) for processing the data and management information.
, 13LOCK) 2, a disk controller (DISK, CTL) 4 that controls a disk drive device (DISK) 5 according to a command from the central processing unit 2, and a destination address of a write-once storage medium (not shown) according to a command from the disk controller 1. It consists of a disk drive device (DISK) 5 that writes and reads data and management information to and from the storage device, and when storing a large amount of file information, the management information storage area is divided for each file and the management information is stored. Was.

Problems to be Solved by the Invention However, with such a configuration, since the management information recording area is divided and fixed, there is a problem that it becomes impossible to store all the management information.

The above problem arises for the following reasons. In other words, since write-once storage media are not rewritable, the management information cannot be rewritten, and especially in large-capacity storage media, the management information also has a large capacity, so the management information recording area This is because the access speed to the destination address is increased by dividing and fixing the address.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a recording/playback method for a write-once storage device that can store all management information of a large-capacity file without slowing down the access speed. With the goal.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention divides the storage area of a storage medium into a data recording area, a data management information recording area consisting of subdivided segments, and a segment. The segment management information is configured to be a management area and record the segment management information.

According to the above configuration, the present invention records data in the data storage area of the storage medium, allocates one segment of the data management information recording area, records data management information therein, and records the data in the segment. If data management information is recorded in the segment, a new segment is allocated, the remaining data management information is stored in it, and the management information of the segment in which the data management information is recorded is recorded in the segment management area. When reproducing the data, ζ stores segment management information in a memory, reads data management information based on this segment management information, and reproduces data based on this data management information.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a write-once storage device according to the present invention, and the same components as those of the device shown in FIG. 4 described above are given the same reference numerals.

This device includes an input device (IN) 1 for inputting data such as document image information and management information of the data, and a central processing unit CCPU-B for processing the data and data management information.
LOCK) 2, memory for temporarily storing segment management information (described later) MOI%Y) 3,
The disk drive device 5 receives a command from the central processing unit 2.
Disk controller that controls (1) ISK-CTL
) 4, a disk drive device (DISK) 5 that writes and reads data, data management information, and segment management information to and from a destination address of a write-once storage medium (not shown) according to a command from the disk controller 40, and The output device (OUT) 6 is generally constructed from an output device (OUT) 6 for outputting the data.

FIG. 2 is an explanatory diagram of the format stored in the write-once storage medium, and includes a data recording area 7a where data such as image information is recorded in document units, and a management information recording area where document management information of the data is stored. 7b, and a segment management area 7c.

The management information recording area 7b includes a plurality of segments (1), (
2)..., and the segment management area 7C has segment management sectors (1), (2), etc. corresponding to the aforementioned segments (1), (2)..., respectively.
It is subdivided into... Each segment management sector (
1) and (2), as shown in FIG. 3, the file name and segment capacity stored in the segment are stored.

The operation of the embodiment of the above configuration will be explained.

First, when recording, data, data management information, and segment management information are taken into the central processing unit 21 via the input device 1, and the data is recorded in the data storage area 7ai of the write-once storage medium. . In this case, if the data management information is a new file, 1 of the management information recording area 7b
In addition, the management information of this segment, such as the file name and the capacity of the data management information stored in the segment as shown in Figure 3, is stored in the memory 3ζ.

In the next step A, the segment management information in the memory 3 is stored in the segment management sector of the segment management area 7C, and the inside of the memory 3 is updated. And central processing unit 2
The disk controller 4 instructs the disk drive device 5 to record data management information in the corresponding segment of the management information recording area 7b.

It should be noted that once the management information is recorded in the segment funds added to the file, a new segment is added and the remaining management information is recorded in the same process as in the above case.

In the case of playback, when the disk drive device 5 is started up
The segment management information is read from this storage medium and stored in memory 3.
Store in. Next, in response to a request from an external device such as a search device, the segment management information stored in the memory 3 is referred to, and the address at which the desired data management information is stored is derived. Then, the disk controller 4 operates the disk drive device 5 according to instructions from the central processing section 2, and reads data management information from the storage medium. The data is reproduced based on the read data management information.

That is, since the data management information is read after the segment management information is read, the access time does not become long.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention provides a method for recording and reproducing management information of a plurality of large-capacity files in a write-once storage device by dividing the data management information into i segments. Therefore, it is possible to record all the management information of a large-capacity file, and the access time does not become long.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the write-once storage device according to the present invention, FIG. 2 is an explanatory diagram of a storage format used in the device shown in FIG. 1, and FIG. Fig. 4 is an explanatory diagram of the segment management area in the figure, and Fig. 4 is a block diagram of a conventional example. 2. Central processing unit, 3.. Memory, 7a.. Data recording area, 7b.. Management information recording area. , 7c...Segment management area. Name of agent: Patent attorney Toshio Nakao and 1 other list
1 Secret figure 2 of 3

Claims (1)

[Claims] A storage medium of a write-once storage device is divided into an area where data is recorded, a data management information recording area which is subdivided into a plurality of segments each having a predetermined capacity and where management information of the data is recorded, and a data management information recording area where the data management information is recorded. A segment management area is divided into a segment management area in which management information about the segment is recorded, and one segment of the data management information recording area is allocated to one file in which data is recorded in the data recording area of the storage medium to record the data management information. At the same time, other segments are allocated to other files, and if the data management information of the file corresponding to the entire allocated segment is recorded, new segments are allocated to the file in sequence. Data management information is recorded, and the management information of these segments is also recorded in the segment management area.When data is played back, the segment management information is stored in the playback unit memory, and data management is performed based on this segment management information. A recording/reproducing method for a write-once storage device characterized by reading information and reproducing data.