JPS63220317A - Writing area management system for rewriting disable medium - Google Patents

Abstract

PURPOSE:To sharply save an idle area information label area by saving an idle area information label to a saving device, updating data only in the saving device at the time of forming a new file to be frequently generated or expanding an already existing file, and only at the time of ejecting a rewriting disabled medium from a file device, writing data in the rewriting disable medium. CONSTITUTION:Only when it is necessary to form a new file or expand an already existing file in the rewriting disable medium 2, an idle area information label updating means 1-2 inputs a saved label 3-1 from the saving device 3, updates the contents of the label 3-1 and newly writes the updated contents as a saved label 3-1. When the ejection of the medium 2 is requested, an idle area information label restoring means 1-3 inputs the saved label 3-1 from the device 3 only when the label 3-1 is updated, writes a new idle area information label L4 in the medium and ends the writing to eject the medium 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a write area management system for non-rewritable media used in file devices.

[Conventional technology]

In the write area management method for non-rewritable media used in conventional file devices, a free space information label area is provided on the non-rewritable media, and this is used when creating a new file or saving an existing file on the non-rewritable media. When expanding, a new free space information label is written on the non-rewritable medium each time.6 [Problems to be solved by the invention] The above-mentioned conventional write area management method for non-rewritable media is used. Then, each time you create a new file or extend an existing file, a new free space information label is written on the non-rewritable medium, so the free space information created on the non-rewritable medium There is a problem that the number of labels increases unnecessarily and a large free space information label area is required.

In addition, as the number of free space information labels on non-rewritable media increases, it becomes more difficult to load non-rewritable media into a file device, create new files on non-rewritable media, and expand existing files. When you do,
Each method has the disadvantage that it takes a long time to search for the required free space information label.

An object of the present invention is to reduce the number of free space information labels created on a non-rewritable medium, effectively utilize the area on the non-rewritable medium, and shorten the search time for free space information labels. The object of the present invention is to provide a method for managing a writing area of a medium.

[Means for solving the problem] The write area management method for non-rewritable media of the present invention is as follows:-
Write area management for non-rewritable media where data cannot be written again to the area where data has been written once. In the method, a rewritable saving device is provided for saving and storing the free space information label, and the free space information label is saved to the saving device when the non-rewritable medium is loaded into the file device. a free space information label saving means, and a free space for updating the free space information label being saved in the saving device when there is a change in the free space information of the non-rewritable medium such as creating a new file or extending an existing file. an area information label updating unit; and when the free space information label being saved in the saving device has been updated, the updated free space information label is rewritten before the non-rewritable medium is removed from the file device. and a free space information label restoring means for writing to an unwritten area different from the original position on the disabled medium.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a write area management system for non-rewritable media according to the present invention.

In FIG. 1, a data processing device 1 includes free space information label saving means l-1 and free space information label updating means 1-2.
and a free space information label restoring means 1-3, and the non-rewritable medium 2 loaded in the file device is stored in the free space information label area 2-1 in order of LL and L from the oldest one.
2. Free space information labels L3 and L4 are stored, indicating that the file area 2-2 includes a written area for storing one or more files and an unwritten area into which new data can be written in the future. The evacuation device 3, which uses a magnetic disk in which stored data is not lost even in the event of a power outage, has an evacuation label 3-, which is a free space information label, saved by the free space information label evacuation means 1-1. 1 is included.

Note that the above free space information labels L1 and L2 are no longer needed because they were already updated when this non-rewritable medium 2 was used in the past, and the free space information label L3 is the one that is no longer needed for this non-rewritable medium 2. It is valid when the medium 2 is loaded, and the free space information label L4 indicates what is written when the current process is completed and the non-rewritable medium 2 is removed from the file device.

Next, the operation of the write area management system for non-rewritable media in this embodiment will be explained.

Figure 2 shows that a non-rewritable medium 2 is loaded in the file device,
2 is a flowchart showing a processing operation from the time when file processing involving the creation of a new file or the extension of a file to the non-rewritable medium 2 to the time when the non-rewritable medium 2 is removed.

Further, FIGS. 3, 4, and 5 respectively show the free space information label saving means 1-1. It is a flowchart showing the processing operations of the free space information label updating means 1-2 and the free space information label restoring means 1-3.

In FIG. 2, when the operation is started and the non-rewritable medium 2 is loaded in the file device, the free space information label saving means 1-1 is activated in step 21 to save the non-rewritable medium 2 in step 31 as shown in FIG. 2 to free space information label L
3 is input, and this is written in the evacuation device 3 as an evacuation label 3-1 in step 31.

Next, the process moves to step 22, and only when it is necessary to create a new file or expand an existing file on this non-rewritable medium 2 (YES), in step 23, the free space information label updating means 1-2 updates the fourth As shown in the figure, the evacuation label 3-1 is input from the evacuation device 3 in step 41, its contents are updated in step 42, and it is newly written as the evacuation label 3-1 in step 43.

Next, the process proceeds to step 24, but if there is no request to remove the non-rewritable medium 2 (No), the process returns to step 22 and repeats the above operations. If there is a request to remove the non-rewritable medium 2 (YES), the process moves to step 25, and the free space information label restoring means 1-3 determines that the evacuation label 3-1 has been updated in step 51, as shown in FIG. Only in this case, the evacuation label 3-1 is input from the evacuation device 3 in step 52, and a new free space information label L4 is written to the non-rewritable medium 2 in step 53, and the process ends. Can be removed.

〔Effect of the invention〕

As explained above, the present invention saves the free space information label to the save device, updates it only on the save device when creating a new file or expanding an existing file, which occurs frequently, and saves the free space information label to the save device, thereby saving the free space information label to the save device and updating it only on the save device when creating a new file or extending an existing file, which occurs frequently. By writing on non-rewritable media only when removed from the file device,
The number of free space information labels created on non-rewritable media is significantly reduced, resulting in a significant saving in free space information label space, and the search time for free space information labels when loading non-rewritable media. This has the effect of shortening the processing time, and it is no longer necessary to search for a free space information label on a non-rewritable medium when creating a new file or expanding an existing file, thereby significantly shortening the processing time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flowchart showing the processing operation of an embodiment of the invention, FIG. 3 is a flowchart showing the processing operation of the free space information label saving means, and FIG. The figure is a flowchart showing the processing operation of the free space information label updating means, and FIG. 5 is a flowchart showing the processing operation of the free space information label restoring means. 1... Data processing device, 1-1... Free space information label saving means, 1-2... Free space information label updating means, 1-3... Free space information label restoring means, 2...
- Non-rewritable medium, 2-1 free space information label area,
2-2...File area, 3...Evacuation device, 3-1
...Evacuation label. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] Write area management for non-rewritable media where one or more files and a free space information label containing information on free space are written and used. Once data has been written, it is not possible to write again. In the method,
A rewritable saving device for saving and storing the free space information label; and free space information for saving the free space information label to the saving device when loading the non-rewritable medium into the file device. label evacuation means;
a free space information label updating means for updating the free space information label being saved in the saving device when there is a change in the free space information of the non-rewritable medium such as creation of a new file or expansion of an existing file; If the free space information label being saved to the save device has been updated, the updated free space information label is replaced with the original position on the non-rewritable medium before the non-rewritable medium is removed from the file device. 1. A write area management method for a non-rewritable medium, comprising a free space information label restoring means for writing to another unwritten area.