JPH10247363A - Information storage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information storage system realizing optimum arrangement control of data between different kinds of media, in which characteristics of various kinds of disk type recording media are considered. SOLUTION: A media controller 13 detects data (or data, of which rewriting frequency is less than a prescribed value), of which rewriting has not been performed during a fixed period out of data arranged in a reloadable type disk, this detected data is rearranged in a DRAW type disk. Also, in the case of that a writing system for this DRAW type disk is a system in which writing operation is performed with one time per one disk, when total sum capacity of data (detected data) to be rearranged exceeds the prescribed value, rearrangement is performed in the same DRAW type disk en bloc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to, for example, a CD-ROM.
The present invention relates to an information storage system using an autochanger capable of removably storing a plurality of disc-type recording media such as a ROM, a CD-R, a DVD-R, a DVD-RAM, etc., and in particular, various disc-type recording media The present invention relates to an information storage system that realizes optimal arrangement control of data between different types of media in consideration of characteristics of the information.

[0002]

2. Description of the Related Art In recent years, the spread of computers in offices and the like has been remarkable, and the amount of data handled has been increasing with the spread. Under such circumstances, various information storage systems for efficiently storing a huge amount of information have been developed. One of them is an autochanger (a plurality of disk-type recording media which can be detachably stored). There is an information storage system using an information storage system (which may be referred to as a jukebox or the like).

In this autochanger, a plurality of magneto-optical disks are stored in a magazine case, and the changer replaces the magneto-optical disks loaded in the magneto-optical disk drive as needed, thereby providing a virtual change. This realizes a mass storage device. In the information storage system using this autochanger, in order to make data accessible more efficiently, optimal arrangement control such as relocating frequently accessed data to the same magneto-optical disk is performed. ing. By this optimal arrangement control, for example, the operation of replacing the magneto-optical disk by the changer can be minimized, and the response time of the entire system can be greatly reduced.

[0004]

As described above, in the information storage system using the conventional autochanger, by performing the optimal arrangement control, a desired data can be selected from all the data arranged on a plurality of disk type recording media. Makes data accessible efficiently.

On the other hand, recently, various types of disk-type recording media have been developed as described below. (1) Read-only disc (-ROM: Read Only memory) (2) Write-once disc (-R: Recordable) (3) Rewritable disc (-RAM: Randam Access Memory) Of these, write-once disc of (2) As a writing method, there are a writing method in which a writing operation is performed once per disk and a writing method in which additional writing can be performed a plurality of times.

[0006] These disk-type recording media (1) to (3) have various characteristics such as price, storage capacity, and the number of rewritable times, and the user can properly use the disk-type recording media in consideration of those characteristics. I was doing.

However, in the information storage system using the above-described autochanger, it is assumed that only a single type of disk-type recording medium is stored in the magazine case of the autochanger. Optimal arrangement control such as rearrangement between different types of media in consideration of the characteristics of the recording medium has not been performed.

The present invention has been made in view of such circumstances, and has as its object to provide an information storage system which realizes optimal arrangement control of data between different types of media in consideration of the characteristics of various disk-type recording media. And

[0009]

According to the information storage system of the present invention, for example, an MO
(Magneto-Optical disk) or other data that has not been rewritten for a certain period of time (or data whose rewriting frequency is lower than a predetermined value) is recorded on a CD (Compact Disc) -R Optimum allocation control, such as relocation to a write-once disk, is performed. As a result, for data such as document data that is likely to be updated only for a while after being created, first place it on a rewritable disc, and after the contents have hardened, write it to a write-once disc. As a result, the data storage cost can be reduced.

At this time, in the information storage system of the present invention, the execution timing of the rearrangement is controlled in consideration of, for example, whether writing to the write-once disc is performed by a method capable of performing additional writing a plurality of times. For example, when using the method that can be performed multiple times, relocation is performed each time data to be relocated is detected. On the other hand, when using the method that writes once per disk, relocation is performed. For example, when the total capacity of data to be exceeded exceeds a predetermined value, relocation is collectively performed on the same disk type recording medium. As a result, the write-once disc can be effectively utilized to the maximum without waste even when writing is performed once per disc.

Further, the information storage system of the present invention has a C
Data located on a read-only disk such as a D-ROM and having an access frequency equal to or higher than a predetermined value is converted into relocatable data by copying the data to a rewritable disk such as an MO. Perform optimal placement control.

Further, the information storage system of the present invention manages information for judging the replacement time of a plurality of types of disk-type recording media for each type of disk-type recording medium, so that the characteristics of each disk-type recording medium are Execute the exchange management that conforms to.

Further, the information storage system of the present invention controls a storage element for storing a disk-type recording medium in consideration of a moving distance between a drive device of an autochanger and a storage element in a magazine case. In other words, control is performed so that a disk-type recording medium in which frequently accessed data is arranged is stored in a storage element whose replacement time by the changer is relatively short. As a result, optimal placement control is also performed for the storage location of the disk-type recording medium itself.

Further, the information storage system of the present invention sets, for each data, whether to execute the data rewriting by overwriting or to execute while rewriting the data before rewriting as a history. Optimum placement control, such as sorting the types of disk-type recording media, is performed. That is, the data set to be executed by overwriting is arranged on a rewritable disk-type recording medium, and the data set to be executed while leaving the data before rewriting as a history is arranged on a write-once disk-type recording medium. As a result, optimal arrangement control that matches the characteristics of various disk-type recording media is performed.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of an information storage system according to an embodiment of the present invention. As shown in FIG. 1, in this information storage system 10, under the control of a file server computer 10, an autochanger 2
All kinds of disk-type storage media 23a to 23b accommodated in magazine cases 22a to 22b in each of 0a to 20b are handled as one virtual mass storage device 40, and respond to various access requests transmitted via the network 30. Then, data is read from and written to the disk-type storage media 23a to 23b.

This file server computer 10
It comprises a CPU 11, a main memory 12, and a media management controller 13. The CPU 11 controls the entire file server computer 10. The main memory 12 has a CP
It is a memory device that stores various application programs including the operating system 50 and utilities that are controlled by the execution of U11, and various data used for executing these. Then, the media management controller controls the autochangers 20a to 20a so that the data in the virtual mass storage device 40 is optimally arranged.
0b, and is operated by a unique CPU mounted on the same expansion board. This media management controller is, for example, a CD-ROM,
CD-R, MO, DVD (Digital Video-Disc) -RO
In order to control access to each of a plurality of types of disk-type recording media such as M, DVD-R and DVD-RAM, a plurality of types of file systems are provided. Further, the media management controller 13 has a unique disk cache 14.

The main memory 12 stores the CPU 11
Operating system 50 whose execution is controlled by
, The file management application program 51 and the device driver 52 operate independently. The file management application program 51
This is a program for processing various access requests transmitted via the network 30, and sends an access command corresponding to the access to be processed to the device driver 52.
And a program for receiving and returning the results. Then, the device driver 52 executes the file management application program 5
1 drives the media management controller 13 in response to the access command issued by It should be noted that the file management application program 51 operating under the control of the operating system 50 is conscious of what type of disk-type storage medium (or whether it is allocated) the data to be accessed. The media management controller 13 performs all the optimal placement control of data between different types of media including relocation.

In the information storage system shown in FIG.
One virtual large-capacity storage device 40 is constructed by two autochangers 20a to 20b. For example, the autochanger (A) is for MO, and the autochanger (B) is used.
In the system as a whole, a plurality of types of disk-type storage media may be mixed by using different types of disk-type storage media for each autochanger, such as for a CD and a DVD, or a plurality of types of disk-type storage media A plurality of types of disk-type storage media may be mixed by storing the media.

The automatic changers 20a to 20b
A plurality of drive devices 21a to 21b are provided, and a plurality of disk-type storage media 23a to 23b are stored in storage elements of the magazine cases 22a to 22b. In addition, the changers 24a to 24b include a drive device 21a.
-Type storage media 23a-23 loaded in the storage media 21a-21b
Replace b if necessary. The autochangers 20a to 20b and the file server computer 1
0 is the media management controller 13 of SCSI2.
(Small Computer System Interface 2).

(First Embodiment) Here, a first embodiment of the information storage system having such a configuration will be described.

In the first embodiment, an example will be described in which data arranged on a rewritable disc is relocated to a write-once disc. The media management controller 13 of the first embodiment uses two management tables, the media management table shown in FIG. 2 and the file management table shown in FIG. 3, to control the execution of the relocation. The media management table is a table for managing information of each of the disk-type storage media 23a to 23b, which is a component of the virtual mass storage device 40, and has an internal serial N
o, media type, media serial number, use start date, last access date (Read / Write), access count (Read / Write), storage location, and the like are managed. Among these, the storage location manages information indicating that the disk type storage media 23a to 23b is stored in which storage element of which autochanger, or is in a state of being removed from the autochanger (offline).

On the other hand, the file management table is a table for managing information of each data file stored in the virtual mass storage device 40.
The last access date (Read / Write), the number of accesses (Read / Write), storage media, storage expiration date, accompanying information, and the like are managed. Among them, various flag areas and the like described later are secured in the accompanying information.

The operation procedure of the media management controller 13 according to the first embodiment will now be described with reference to FIG. The media management controller 13 reads the file management data from the beginning (steps A1 to A2), and determines whether a file corresponding to the read file management data is arranged on a rewritable disk (step A3). . This determination is made based on information managed as a media type in the detected media management data by detecting the corresponding media management data from the media management table using the internal serial number managed as the storage medium as a search key. . When the media management controller 13 determines that the file corresponding to the read file management data is located on the rewritable disk (Y in step A3), it determines whether to relocate the file to the write-once disk. A determination process is performed (step A4).

This determination can be made, for example, by determining that relocation to a write-once disc is to be performed when a predetermined period has elapsed from the last rewrite date obtained from the last access date, or from the number of accesses. When the total number of accesses exceeds a predetermined value, and the ratio of rewriting (rewriting frequency) in the total access number is lower than the predetermined value, it is determined that relocation to the write-once disc is performed. It is performed by things. In addition,
The first embodiment is characterized by the optimal arrangement control of data between different types of media such as rewritable discs and write-once discs, and is not characterized by this determination rule or criteria. Therefore, the determination rules and criteria are not limited to these, and various determination rules and criteria can be applied.

When the result of this determination is that the disc is to be relocated to a write-once disc (step A5).
(Y), the media management controller 13 relocates the file corresponding to the file management data from the rewritable disc to the write-once disc, and updates the media management data and the file management data accompanying the relocation. Is executed (step A6). Then, the media management controller 13 repeats the above-described processing until the determination of all files is completed (Y in step A7) (N in step A7, step A8, step A2).
~).

As described above, the media management controller 13
By executing the optimal arrangement control, the information storage system of the first embodiment can rewrite data such as document data, whose update concentrates only for a while after creation, at first. The data is stored on the write-once disk after the contents are almost solidified, and the data storage cost can be reduced.

For example, when writing data onto a write-once disc in a manner in which a write operation is performed on one disc at a time, the above-described steps A5 to A6 in FIG. 4 are replaced with steps B1 to B5 in FIG. Is valid.

That is, the media management controller 13
Turns on a predetermined flag secured in the accompanying information of the file management data when the result of the determination processing is to perform relocation to a write-once disc (Y in step B1) (step S1). B2). At this time, the media management controller 13 obtains the total capacity of the file corresponding to the file management data for which this flag is ON, and only when the total capacity has reached a predetermined value (Y in step B3). ), And relocate the files collectively to the same write-once disk (step B).
4). After the rearrangement is completed, the media management controller 13 turns off the flag of the file management data of the relocated file (step B5).

As a result, the write-once disc to be written by the method in which the writing operation is performed once per disc can be effectively utilized to the maximum without waste. (Second Embodiment) Next, a second embodiment of the present invention will be described.

In the second embodiment, an example will be described in which data arranged on a read-only disk is converted into relocatable data by copying the data to a rewritable disk. As in the first embodiment, the media management controller 13 of the second embodiment controls the execution of the conversion process by two media management tables, a media management table shown in FIG. 2 and a file management table shown in FIG. Use a table.

Here, an operation procedure of the media management controller 13 of the second embodiment will be described with reference to FIG. The media management controller 13 reads the file management data from the beginning (steps C1 and C2), and determines whether a file corresponding to the read file management data is arranged on a read-only disk (step C3). This determination is made based on information managed as a media type in the detected media management data by detecting the corresponding media management data from the media management table using the internal serial number managed as the storage medium as a search key. . When the media management controller 13 determines that the file corresponding to the read file management data is located on the read-only disk (Y in step C3), it determines whether or not to perform copying to a rewritable disk. Is performed (step C4).

This determination is made, for example, by determining that copying to a rewritable disk is performed when the number of readings obtained from the number of accesses exceeds a predetermined value. The second embodiment is characterized by control of conversion from a read-only disk to data that can be relocated by copying from a read-only disk to a rewritable disk, and does not feature this determination rule or determination criterion. Therefore, the determination rules and criteria are not limited to these, and various determination rules and criteria can be applied.

If the result of this determination is that copying to a rewritable disk is to be performed (Y in step C5), the media management controller 13 reads the file corresponding to the file management data from the read-only disk. The data is copied onto a rewritable disk, and the media management data and the file management data are updated with the copy (step C6). Then, the media management controller 13 repeats the above-described processing (N in step C7, step C8, step C2) until the determination of all files is completed (Y in step C7).

As described above, the media management controller 13
Performs the data conversion control, whereby the second
In the information storage system of the embodiment, for example, a plurality of CDs
-Frequently accessed data scattered in the ROM can be aggregated on a frequently driven rewritable disc, and the response time of the entire system can be shortened.

(Third Embodiment) Next, a third embodiment of the present invention will be described. In the third embodiment, for example, CD-ROM, CD-R, MO, DVD-ROM,
An example in which the replacement time of a plurality of types of disk-type recording media such as a DVD-R and a DVD-RAM is controlled for each type will be described. The media management controller 13 of the third embodiment uses two management tables, a media management table shown in FIG. 2 and a replacement time management table shown in FIG. 7, to control the replacement time. The exchange time management table is a table for managing information for determining the exchange time of the disk-type recording medium for each type, and manages the media type, usage period, number of rewrites, and the like.

Here, the operation procedure of the media management controller 13 of the third embodiment will be described with reference to FIG. The media management controller 13 reads the media management data from the beginning (Step D1 to Step D2), and determines whether or not the disk type recording medium corresponding to the read media management data has come to be replaced (Step D3). . This determination is made based on whether the elapsed period obtained from the use start date exceeds the usage period of the medium, or whether the number of rewrites obtained from the number of accesses exceeds the number of rewrites of the medium. It should be noted that the third embodiment is characterized in that the replacement time is controlled for each type of medium, and is not characterized by this determination rule or criterion. Therefore, the determination rules and criteria are not limited to these, and various determination rules and criteria can be applied.

When the result of the determination is that the replacement time has come (Y in step D4), the media management controller 13 outputs a warning message prompting replacement of the disk type storage medium (step D5). ). Then, the media management controller 13 repeats the above processing (N in step D6, step D7, step D2) until the determination of all files is completed (Y in step D6).

As described above, the media management controller 13
In the information storage system according to the third embodiment, the replacement management that matches the characteristics of the disk-type recording medium is performed by determining the replacement time of the disk-type recording medium for each type.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, drive devices 21a to 21b and magazine cases 22a to 22b
An example in which the storage element that stores the disk-type recording medium is determined in consideration of the movement distance between the storage elements 22b will be described. The media management controller 13 of the fourth embodiment uses the storage element management table shown in FIG. 9 to determine the storage element that stores the disk-type recording medium. The storage element management table is a table for managing the priority of storage elements provided in the magazine cases 22a to 22b,
The priority and the storage element No. are managed.

Here, the magazine cases 22a to 22b
Is provided with 100 storage elements, and the storage elements closest to the three drive devices 22a to 22b are (25), (50) and (75), respectively. At this time, the changer 24
Since the storage elements having the shortest replacement time by a to 24b have the shortest moving distances (25), (50) and (75), the three storage elements (25), (50) and (75) are used. Register the highest priority storage element in the storage element management table.

Then, the storage element adjacent to (25), (50) and (75), that is, (24)
And (26), (49) and (51), and (74) and (76) are registered in the storage element management table as the storage element with the next highest priority.

Then, the media management controller 13
With reference to the storage element management table registered in this way, the information storage system according to the fourth embodiment stores the disk-type recording medium with a high access frequency in the storage element with the shortest replacement time. And the response time of the entire system can be shortened.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described. In the fifth embodiment, it is set for each data whether the data rewriting is to be performed by overwriting or to be performed while leaving the data before rewriting as a history. An example in which optimal arrangement control such as sorting types is executed will be described. The media management controller 13 of the fifth embodiment uses a file management table obtained by adding a rewriting method to the file management table shown in FIG.

The operation procedure of the media management controller 13 according to the fifth embodiment will be described with reference to FIGS. FIG. 10 shows an operation procedure when new data is written.

When a new file is written, the media management controller 13 receives setting information as to whether to execute data rewriting by overwriting or to execute while rewriting the data before rewriting as a history. The setting method is stored in the rewriting method of the created file management data (step E1). If the set contents are to be executed while leaving the data before rewriting as a history (Y in step E2), the media management controller 13 stores this file in a write-once disc (step E3). On the other hand, if the file is to be executed by overwriting (Y in step E2), this file is stored in a rewritable disc (step E4).

That is, by the arrangement control of the media management controller 13, in the information storage system of the fifth embodiment, the optimal arrangement control conforming to the characteristics of the disk-type recording medium is performed.

FIG. 11 shows an operation procedure for actually rewriting data. When actually rewriting the data, the media management controller 13 reads the file management data corresponding to the file from the file management file (step F1), and determines the file to be rewritten by the rewriting method of the read file management data. It is determined whether rewriting is set to be performed by overwriting or set to be performed while leaving data before rewriting as a history (step F).
2). If the result of this determination is to execute by overwriting (N in step F2), the media management controller 13 rewrites the data located on the rewritable disk and media management data accompanying this rewriting. Then, the file management data is updated (step F3).

On the other hand, if the data is to be executed while leaving the data before rewriting as a history (step F2).
Y), after the file name managed in the file management data corresponding to the data before rewriting is changed according to a predetermined rule (step F4), new data is written to any write-once disc (step F4). F
5). At this time, the media management controller 13 determines whether or not the total number of data before rewriting (which may be a total capacity) remaining as a history exceeds a predetermined value (step F6). If it exceeds (Y in step F6), a warning message notifying the fact is output (step F7).

As described above, the media management controller 1
By the rewriting control performed by 3, operation support such as warning of the existence of unnecessary data is implemented.

For example, instead of outputting the warning message shown in step F7 of FIG. 11, it is also effective to relocate the data from a write-once type disk-type recording medium to a rewritable type disk-type recording medium. is there. In this case, for example, it is possible to automatically prevent unnecessary data from increasing.

[0051]

As described above in detail, according to the present invention, for example, a read-only disk (CD-ROM,
VD-ROM), write-once disc (CD-R, DVD-
R) and rewritable discs (MO, DVD-R)
AM), an information storage system using an autochanger capable of removably storing a plurality of types of disk-type recording media in a mixed manner, such that data between different types of media in consideration of the characteristics of various types of disk-type recording media. Optimal arrangement control and replacement time management will be realized.

Further, according to the present invention, the storage location control of the disk-type recording medium itself is performed in consideration of the moving distance between the drive device and the storage element in the magazine case.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an information storage system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a media management table according to the first embodiment of the present invention.

FIG. 3 is a view showing a file management table according to the first embodiment;

FIG. 4 is an exemplary flowchart for explaining the operation procedure of the media management controller according to the first embodiment;

FIG. 5 is a flowchart illustrating an operation procedure of a media management controller according to a modification of the first embodiment.

FIG. 6 is a flowchart illustrating an operation procedure of a media management controller according to a second embodiment of the present invention.

FIG. 7 is a diagram showing a replacement time management table according to a third embodiment of the present invention.

FIG. 8 is a flowchart illustrating an operation procedure of the media management controller according to the third embodiment.

FIG. 9 is a diagram showing a storage element management table according to a fourth embodiment of the present invention.

FIG. 10 is a flowchart illustrating an operation procedure when the media management controller according to the fifth embodiment of the present invention writes new data.

FIG. 11 is a flowchart illustrating an operation procedure when the media management controller according to the fifth embodiment of the present invention rewrites data.

[Explanation of symbols]

10: File server computer, 11: CPU, 1
2 ... main memory, 13 ... media management controller, 14
... Disk cache, 20a, 20b ... autochanger, 21a, 21b ... drive device, 22a, 22b
.. Magazine racks, 23a and 23b disk-type recording media, 24a and 24b changers, 30 networks, 40 virtual mass storage devices, 50 operating systems, 51 file management application programs, 52 device drivers.

Claims (11)

[Claims] In an information storage system using an autochanger capable of removably storing a plurality of types of disk-type recording media in a mixed manner, a final type of data recorded on a rewritable disk-type recording medium is selected. Detecting means for detecting data whose elapsed time since rewriting exceeds a predetermined time period, and converting the data detected by the detecting means from a rewritable disk-type recording medium to a write-once-type disk-type recording medium. An information storage system comprising: a rearrangement means for rearranging information. 2. An information storage system using an autochanger capable of removably storing a plurality of disc-type recording media in a mixture of a plurality of types of disc-type recording media, wherein data is rewritten from data recorded on a rewritable disc-type recording medium. Detecting means for detecting data whose frequency is lower than a predetermined value; and relocation for relocating data detected by the detecting means from a rewritable disk-type recording medium to a write-once-type disk-type recording medium. And an information storage system. 3. The relocation means, when the total capacity of the data detected by the detection means exceeds a predetermined value, collectively stores the data on the same write-once disc type recording medium. 3. The information storage system according to claim 1, further comprising means for rearranging information. 4. In an information storage system using an autochanger capable of removably storing a plurality of types of disk-type recording media in a mixed manner, a read frequency is selected from data recorded on a read-only disk-type recording medium. Detecting means for detecting data exceeding a predetermined value, and converting means for copying the data detected by the detecting means onto a rewritable disk-type recording medium and converting the data into relocatable data. An information storage system, comprising: 5. An information storage system using an autochanger capable of removably storing a plurality of types of disk-type recording media in a mixed state, wherein replacement time data including at least one of a use period and a number of rewrites is stored in said information storage system. Replacement time data storage means for storing the disk type recording medium for each type; managing the replacement time of the disk type recording medium for each type of the disk type recording medium based on the replacement time data stored by the replacement time data storage means An information storage system, comprising: a replacement time management unit that performs the replacement. 6. In an information storage system using an autochanger capable of removably storing a plurality of types of disk-type recording media in a mixed manner, determining a relocation execution time of data arranged on the disk-type recording medium. Relocation determination data storage means for storing the relocation determination data for each type of the disk-type recording medium, and performing the relocation of the data based on the relocation determination data stored by the relocation determination data storage means. And relocation execution control means for controlling the type of the disk-type recording medium on which the data is arranged, wherein the frequency of occurrence of relocation is variable for each type of the disk-type recording medium. Storage system. 7. An information storage system using an autochanger in which a plurality of disk-type recording media are detachably stored in a magazine case, wherein a drive device loaded with the disk-type recording medium and a storage element in the magazine case. Storage element priority storage means for storing the priority of each of the storage elements determined according to the moving distance between, and recording medium priority calculation means for calculating the priority of each of the disk-type recording medium, A storage element for storing the disk-type recording medium is determined from the priority of the storage element stored by the storage element priority storage unit and the priority of the recording medium calculated by the recording medium priority calculation unit. An information storage system comprising a storage location determining means. 8. In an information storage system using an autochanger capable of removably storing a plurality of disc-type recording media by mixing a plurality of disc-type recording media, data rewriting is executed by overwriting or data before rewriting is left as a history. Rewriting setting means for setting for each data whether or not to execute, while arranging the data set to be executed by overwriting by the rewriting setting means on a rewritable disk type recording medium, while leaving the data before rewriting as a history An information storage system, comprising: a data arranging means for arranging data set when executed on a write-once disk type recording medium. 9. A name for changing the name of the data before rewriting according to a predetermined rule when rewriting the data set by executing the data rewriting while leaving the data before rewriting as a history by the rewriting setting means. 9. The information storage system according to claim 8, further comprising changing means. 10. A warning means for issuing a warning when the total capacity of data before rewriting of the same data left as a history in the write-once disc type recording medium exceeds a predetermined value. The information storage system according to claim 8 or 9, wherein: 11. When the total capacity of data before rewriting for the same data left as a history on the write-once disk type recording medium exceeds a predetermined value, the data is written on the write-once disk type recording medium. 10. The information storage system according to claim 8, further comprising relocation means for relocating from the medium to a rewritable disk-type recording medium.