JP2668938B2 - Data backup device for write-once optical disks - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a write-once optical disc device, and more particularly to a write-once optical disc backup device for securely holding data stored on a write-once optical disc.

[Conventional technology]

Recently, a write-once optical disc device has come to be used as an external storage device of an office computer or a personal computer. The write-once optical disc is about the same size as the floppy disc, has a much larger storage capacity (for example, 5.25-inch double-sided storage, 800 MB), and has the advantage of being low cost, and further scratches. It has many advantages, such as being resistant to dust and dust, removable and portable.

Conventionally, in the above-mentioned write-once optical disc, after registering the data, the same data is registered in the same write-once optical disc to hold the data, for fear of making the stored data unusable due to the destruction of the disc. Then the data is backed up. The reason for backing up data to the same write-once optical disk is that if the write-once optical disk has a large capacity and data is backed up using a magnetic tape or the like, several magnetic tapes are required for one write-once optical disk. This is because

[Problems to be solved by the invention]

The write-once optical disc cannot write new data once it has been written, but cannot write or read the data, unlike a floppy disk or a magnetic disk.

For this reason, once data is stored in a backup write-once optical disc, data cannot be stored in the same storage area, and a new write-once optical disc for data backup is created every time the data on the optical disc is backed up. Because of the necessity, there is a problem that the cost of the apparatus increases.

SUMMARY OF THE INVENTION It is an object of the present invention to minimize the time required for a data backup process and to maintain the consistency between a first write-once optical disc and a second write-once optical disc.

[Means for solving the problem]

The present invention is a write-once optical disc data backup device for backing up data of a first write-once optical disc 1 (see the functional block diagram of FIG. 1, the same applies hereinafter) to a second write-once optical disc 2, wherein: For each predetermined block of data in the first write-once optical disc 1, reading means 3 for reading in accordance with the arrangement order of the blocks, and erasing indicating that the data of the predetermined block read by the reading means 3 has been erased. If it is data, an erasing unit 4 for erasing the data of the corresponding block of the second write-once optical disc 2 corresponding to the predetermined block of the first write-once optical disc 1 from which the data was read, and the reading. When the data of the predetermined block read by the means 3 is write data indicating the written data, the data is read. It is determined whether or not the corresponding block of the second write-once optical disc corresponding to the specified block of the first write-once optical disc 1 is an unwritten block in which data has not yet been written. When it is determined that the block is a block, a write control unit 5 that writes the data of the predetermined block to the unwritten block is provided.

(Operation)

 The operation of the means of the present invention is as follows.

When backing up the data of the first write-once optical disc 1 to the second write-once optical disc 2, the reading means 3 reads the data in the first write-once optical disc 1 for each predetermined block in accordance with the arrangement order of the blocks. If the data of the predetermined block read by the reading means 3 is erased data indicating that the data has been erased,
The data of the corresponding block of the second write-once optical disc 2 corresponding to the predetermined block of the first write-once optical disc 1 from which the data has been read is erased, and the write control means 5 reads the predetermined block read by the read means 3. If the data is the write data indicating the written data, the corresponding block of the second write-once optical disc 2 corresponding to the predetermined block of the first write-once optical disc 1 from which the data was read is not yet formed. It is determined whether or not the block is an unwritten block in which data has not been written. If it is determined that the block is an unwritten block, the data of the predetermined block is written in the unwritten block.

Therefore, the time required for the data backup process can be minimized, and the consistency between the first write-once optical disc and the second write-once optical disc can be maintained.

(Example of the invention)

Hereinafter, an embodiment will be described with reference to FIGS. 2 to 6.

FIG. 2 is a block diagram showing a system configuration of an office computer to which the write-once optical disc backup device of the embodiment is applied.

In the figure, the CPU 6 has three registers described later inside.
Controls the entire system by executing a system program that has S ₁ , S ₂ , and B ₁ and is stored in the main memory unit 7 consisting of RAM (random access memory) and ROM (read only memory). The central processing unit controls the optical disk drive units 9 and 11 via the optical disk control unit 8 to write data to and read data from the write-once optical disks 10 and 12. In addition, the keyboard unit 13 has a command for formatting the write-once optical disk 10, a command for creating a volume of the formatted write-once optical disk 10, registering a data set or a member described later, and additionally writing data on the write-once optical disk 10. It is an input unit for inputting a command or the like to be stored (backed up) in the type optical disc 12. The command input from the keyboard unit 13 is sent to the CPU 6 via the keyboard control unit 14. The CPU 6 temporarily stores the input command in the work area in the main storage unit 7, analyzes the command, executes the program corresponding to the command, and drives the optical disc drive 9 via the optical disc control unit 8. Then, a data set label, a member label, member data, and the like, which will be described later, are written on the write-once optical disc 10. Further, the data written in the write-once optical disc 10 is stored in the write-once optical disc 12 as described later in detail.

The write-once optical discs 10 and 12 are removable cartridge type discs, and data can be written on both sides of the discs. The display unit 15 is a CRT (Cathode Ray T
ube) or a screen display device such as an LCD (liquid crystal display). A display control unit 16 reads out image data from a display memory 17 that stores screen data created by the CPU 6, and displays the image data on the display unit.
It is a circuit to be displayed on 15.

FIG. 3 shows a memory map of the write-once optical disks 10, 12. As shown in FIG. As shown in FIG. 1, the write-once optical discs 10 and 12 include a label area 18 and a data area 19, and the label area 18 further includes a volume label area 20 and a data set label area 2.
1, a member label area 22. The memory areas shown in the figure are respectively formed on the front and back surfaces of the write-once optical discs 10 and 12. The volume label area 20 is divided into, for example, 16 blocks, and each volume label includes information on a data set label area such as a volume identification name, a data set label size corresponding to this volume, and an initial address of the data set label. It is memorized.

In addition, the data set label area 21 is also configured so as to store a plurality of data set labels, and each data set label has a corresponding data set label name, and the number of member labels included in each data set label. Information about the member label area such as the initial address of the member label is stored.

Further, the member label area 22 is composed of a number of member label blocks, and each member label stores the name of the member label, the size of data included in the corresponding member label, the initial address of the data, and the like.

The data area 19 is an area in which actual data of the corresponding member label is stored.

When writing data to each area of the write-once optical disc 10 having the above configuration, for example, a predetermined key on the keyboard unit 13 is operated and a predetermined command is output to the CPU 6. Label area
20, data set label area 21, member label area 22,
Data areas 19 are sequentially allocated to the front and back surfaces of the write-once optical disc 15. Thereafter, by operating a predetermined key on the keyboard unit 13 to execute a data set registration program, a member set program, a data writing program, etc., the data set name, address data, etc. are written in the data set label. In rare cases, data such as the name of the member and the address of the member data are written in the member label, and necessary data is written in the data area 19.

FIG. 4 (a) is a view showing a state after data is written in the write-once optical disc 10 as described above.

In FIG. 9A, the label area 18 displayed in a shaded manner
And a data area 19 indicates an area where data is written. The shaded area indicates the erased area. That is, the volume label area 20a indicates that the volume label has been once written and erased, and the volume label area 20b indicates a volume label in which information such as a label name and a data set label is registered. Also, the dataset label area 21
The data set label areas 21b, 21b are also based on the volume label in the volume label area 20b described above.
b ′ indicates that the data set 1 label and the data set 2 label are registered. Also, the member label area 22
Indicates that the registration of the member 11 label and the member 12 label is performed based on the information of the data set 1 label, and the registration of the member 21 label is performed based on the information of the data set 2 label. In the data area 19, the member 11 label, the member 12 label, the member 11 data corresponding to the member 21 label, the member 12 data, and the member
21 Indicates that data is being registered. All areas in the write-once optical disc 10 other than the above are free areas.

On the other hand, the write-once optical disc 12 for backing up the above-mentioned registration data of the write-once optical disc 10 is an empty area (new article) at the initial stage as shown in FIG. 4 (b).

If you operate the setting key on the keyboard 13 in this state,
In response to a command input to the CPU 6, a program for backing up the registered data in the write-once optical disc 10 to the write-once optical disc 12 is executed. This processing is executed according to the flowchart of FIG.

That is, this process starts with label area 18, data area.
Assuming that each label and data in 19 is one block, a variable (i) indicating this block number is set to 0 (step
ST1), the data in the volume label area 20a, which is the head of the volume label area 20 in the optical disk 10, is read into the register S1 in the CPU 6 (ST2). CPU 6 determines whether the data read into register S1 is write data (ST
3). Here, the write data refers to a case where a label or data has already been written in the corresponding block, and the written data has been read. In the example of FIG. 4A, the data is erase data indicating that the data has been once written in the volume label area 20a and then the data has been erased. Therefore, the CPU 6 determines that the data read to the register S1 is not write data (ST3 is N (No),
According to 4), it is determined whether the data in the register S1 is erase data. In this case, since the data read into the register S1 is the erase data as described above (ST4 is YES), the CPU 6 executes the process of erasing the same area (the block area where i is 0) in the optical disk 12. (ST5). By this processing, the same area 20a 'of the optical disk 12 is erased as shown in FIG.

Then, i is incremented by 1 and it is determined whether the block number i corresponding to i exceeds the final block (ST6, ST7). Since i = 1 in this first processing, the processing returns to the processing (ST2) and the same processing as described above is repeated.

In the next process, as shown in FIG. 4 (a), since the data in the bloom label area 20b is read into the register S1 in the process (ST2), the data written in the register S1 is the write data, (ST3) becomes Y (yes) and processing (ST
8 、 ST9) is executed. In this process, the above-mentioned data read into the register S1 is also read into the register B1, and the data of the corresponding block on the write-once optical disc 12
It is read into register YS2 in CPU6. Next, CPU6
Determines whether the data read into the register S2 is unwritten data (ST10), and if it is unwritten data, processes (ST11)
The process proceeds to step (ST6) if the data is not unwritten data. Here, the unwritten data is a case where the data has not been written yet and the data can be written in the corresponding area in the future. In the above example, as shown in FIG. 4B, the corresponding area of the write-once optical disc 12 is an unwritten area, and the data read to the register S2 is unwritten data. Therefore, at this time, the judgment (ST10) becomes Y,
Corresponding volume label area 20 of the write-once optical disc 12
The data written in the register B ₁ , that is, the data of the volume label stored in the volume label area 20b of the write-once optical disc 10 is written in b ′ (ST
11). In this way, data is written in the volume label area 20b 'of the write-once optical disk 12 as shown in FIG. 4 (c). Volume label area 20 of the write-once optical disc 12
It goes without saying that the volume label written in b 'contains the address data of the data set 1 label and the data set 2 label as described above.

Next, when the process (ST6) is executed again, i = 2, and
Similar to the above, the process returns to the process (ST2) and the same process is repeated (ST7 → ST2 → ST3). Since the next block i = 2 in the volume label area 20 is an empty area, the diagnosis (ST3, ST3
Both 4) are N, and the write-once optical disc 12 is not written to the corresponding area of the write-once optical disc 12.
The corresponding area of is kept as an empty area.

After that, the same processing and judgment (ST2 → ・ ・ ・ → ST7) as i = 3 → 4 → 5 → ... are repeated, and the data set label area 21 → member label area 22 → data area in the write-once optical disc 10 is repeated. The data of 19 is written in the corresponding area in the write-once type optical disc 12 to create the data (after copying) shown in FIG. 4 (c).

Therefore, by performing the above-described processing, the completely same data as the data in the optical disk 10 is stored in the optical disk 12 (since the data is backed up). The data is safely stored on the write-once optical disc 12 even when the data is unusable.

Next, when the write-once optical disc 10 becomes unnecessary and the storage data in the write-once optical disc 12 in which data is stored as described above is also unnecessary, the conventional write-once optical disc 12 cannot be reused conventionally. In this example, this write-once optical disc
The data of the write-once optical disc 10 'on which other data has been written is stored by using the data 12. FIG. 6 (a) is a diagram showing data contents in a new write-once optical disc 10 '.
FIG. 2B is a diagram showing a memory map of the write-once optical disc 12 in a state where data in the write-once optical disc 10 is stored as described above. Also in this case, the processing is executed according to the flowchart of FIG. That is, when the volume label 20a ″ of i = 0 shown in FIG. 6A is erased, the corresponding area of the write-once optical disc 12 is also erased, and the same processing or determination as described above (ST1 → ST2S → ST3) is performed.
→ ST4 → ST5) is executed and the volume label area 20a ′ in the write-once optical disc 12 remains in the erased state. The volume label area 20b ″ of i = 1 already exists in the same volume label area 20b of the write-once optical disc 12.
Since the same volume label is also stored in b ′, processing or determination (ST2 → ST3 → ST8 → ST9 → ST10) is executed,
Volume label 20 because judgment (ST10) is N
The process of writing the data of "b" is not performed. Hereinafter, when the corresponding area of the write-once optical discs 10 'and 12 is an empty area, the processing and determination (ST2 → ST3 → ST4) are executed, and Is processing and judgment (ST2 → ST3 → ST8 → ST9 → ST1
0) to proceed to the next block without performing the process of writing the same data to the write-once optical disc 12.

On the other hand, if the data in the corresponding area in the write-once disc 12 is write data (for example, the data set label area 21b ″) even though the data in the write-once optical disc 10 ′ is erased, a new copy is performed. Processing and determination to match write-once optical disc 10 'to be performed (ST2 → ST3 →
Execute ST4 → ST5) to delete the corresponding area.

Also, if the corresponding area in the write-once disc 12 is an empty area despite the area where data in the write-once optical disc 10 'exists (for example, data set 3 label, member 22 label, member 22 data In the area), processing and judgment (ST2 → ST3 → ST8 → ST9 → ST10 → ST11) are performed to match the write-once optical disc 10 'to be newly copied, and a new label or data is written in the corresponding area. .

When the above processing is executed up to the last block, the sixth
A write-once disc 12 in which the data in the write-once optical disc 10 'shown in FIG. Therefore, by performing such processing, the write-once optical disc 12
Can be used again as a data backup disk for the write-once optical disk 10 '.

As described above, in the present embodiment, even if the write-once optical disc has been used as a data backup once, the above-described processing can be used to perform the data backup for the write-once optical disc that has been repeatedly changed. It can be used as a disc.

In this embodiment, the data write-once optical disk 12 for data backup is mounted on the drive device 9 of the write-once optical disk 10 or 10 'for which data backup is to be performed and the drive device 11 separate from the data write-once optical disk 10. The data backup device of the present invention can be constituted by a single optical disk drive device even if the optical disk drive device performs an operation of exchanging the write-once optical disks 12 and 10 or 10 'on the way.

〔The invention's effect〕

According to the present invention, only data of a block to be backed up on the second write-once optical disc among the data on the first write-once optical disc is written on the second write-once optical disc, and the data is written on the first write-once optical disc. Since the data of the block of the second write-once optical disc corresponding to the erased block is erased, the time required for the data backup process can be minimized and the first write-once optical disc can be minimized. And the second write-once optical disc.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of the present invention, FIG. 2 is a block diagram showing a system configuration of an office computer to which a backup device for a write-once optical disc according to one embodiment is applied, FIG. 3 is a diagram showing a data configuration, FIG. 6 (a) to 6 (c), FIGS. 6 (a) to 6 (c) are data configuration diagrams for explaining data backup processing, and FIG. 5 is a flowchart for explaining data backup processing. DESCRIPTION OF SYMBOLS 1 ... 1st write-once optical disc, 2 ... 2nd write-once optical disc, 3 ... read-out means, 4 ... erasing means, 5 ... write control means.

Claims (1)

(57) [Claims] An apparatus for backing up data from a first write-once optical disc to a second write-once optical disc, comprising: When the reading means for reading in accordance with the arrangement order of the block and the data of the predetermined block read by the reading means are erased data indicating that the data has been erased, the first data read out is the first data. An erasing unit that erases the data of the corresponding block of the second write-once optical disc corresponding to the predetermined block of the write-once optical disc, and a data indicating the written data by the data of the predetermined block read by the reading unit. If the data is read-in data, the data corresponds to a predetermined block of the first write-once optical disc from which the data has been read. It is determined whether or not the corresponding block of the second write-once read-many optical disc is an unwritten block in which data has not been written. If it is determined that the block is an unwritten block, the unwritten block is determined. And a write control means for writing the data of the predetermined block to the write-once optical disc data backup device.