JP2733192B2 - Disc copying method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of copying a disk in a computer system, and more particularly, to a method of efficiently and safely performing re-copying in which a copy source is changed and the same copy destination device is copied. It relates to a possible disk copying method.

[0002]

2. Description of the Related Art FIG. 5 is a diagram showing a general system configuration for performing a disk copy. In FIG. 5, reference numeral 11 denotes a processing unit, 12 denotes a main storage unit, 13 denotes a copy source disk,
Reference numeral 14 denotes a copy destination disk. In the above-described system, the disk copying process usually checks the volume label of the copy destination device in order to prevent erroneous copying due to erroneous designation of the copy destination device.

FIG. 6 is a diagram showing the above-described copying process.
As shown in FIG. 5A, a volume label is recorded in the copy destination device 14, and when copying is performed, as shown in FIG. Determine if there is a volume label,
If there is no copy, the copying process is performed in step S2, and if there is, the process is abnormally terminated as an erroneous copy.

In the above-described copying program, when recopying to the same copy destination device is performed by changing the copy source, such as when the designation of the copy source device is erroneously copied, the medium recovery program uses the medium recovery program. You cannot copy without deleting the volume label. FIG. 7 is a flowchart showing a conventional process in the case of the re-copying,
Conventionally, as shown in FIG.
In step 1, the medium recovery program is started, and step S
In step 2, the volume label of the copy destination device 14 is deleted. Next, in step S3, the medium recovery program is terminated, in step S4, the disk copy program is started, and in step S5, the copy destination device 1 is started.
The volume label of No. 4 is checked. If there is no volume label, the copying process is performed in step S6, and the process ends. If there is a volume label, the process ends abnormally as abnormal.

[0005]

In the conventional copying program, when re-copying, the volume label of the copy destination device has to be deleted by the medium recovery program as described above. This is inefficient and
In addition, there is a risk that data in the copy source device may be erroneously destroyed when the medium recovery program is used.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the conventional apparatus, and has as its object to provide a disk copying method for efficiently and safely performing re-copying.

[0007]

FIG. 1 is a diagram illustrating the principle of the present invention. In the figure, 1 is a copy destination device, 1a is a volume label, 1b is a time stamp area, and after copying processing, an identifier and a copy date are recorded in the time stamp area 1b. Reference numeral 2 denotes a copy source device. In order to solve the above problem, according to the first aspect of the present invention, as shown in FIG. 1, a volume label 1a of a copy destination apparatus 1 is checked, and a copy source apparatus 2 is checked according to the presence or absence of the volume label 1a.
In a disk copying method for copying from a copy destination device 1 to a copy destination device 1, a time stamp area 1b for recording at least a copy date is provided in a user unused area of the copy destination device 1, and when a copy process is performed on the copy destination device 1, The copy date is recorded in the time stamp area 1b, and the copy source device 2
When performing re-copying, the time stamp area 1b is checked, and if the copying date satisfies a predetermined condition, the copying process is performed without checking the volume label 1a.

According to a second aspect of the present invention, in the first aspect, when the time stamp area (1b) is checked and the copy date is within a predetermined time from the copy time, the volume label (1a The copying process is performed without performing the check in (). According to a third aspect of the present invention, in the first and second aspects of the present invention, when the copying process is performed, an identifier is recorded in the time stamp area 1b together with the copy date, and the identifier is transferred from the copy source apparatus 2 to the copy destination apparatus 1. When copying, the identifier of the time stamp area 1b is checked.

[0009]

In FIG. 1, when recopying is performed, the time stamp area of the copy destination apparatus 1 is checked (Step S).
1). When the copy date satisfies a predetermined condition, such as when the copy date is within a predetermined time from the time of the copy, the volume label 1 is determined to be a re-copy.
The copying process is performed without checking a (step S).
2, S4).

If there is no identifier in the time stamp area 1b, or if the copy date does not satisfy the predetermined condition even if the identifier exists, it is determined that the copy is not a re-copy.
The volume label 1a of the copy destination device 1 is checked.
Then, when the volume label 1a is not present in the copy destination apparatus 1, the copy processing is performed. When the copy processing is completed, the copy date and the identifier are written in the time stamp area 1b of the copy destination device, and the process is terminated.

According to the first, second and third aspects of the present invention, as described above, the time stamp area 1b for recording the identifier and the copy date is provided in the unused area of the copy destination apparatus 1, and the copy destination apparatus is provided. In the case where the copying process has been performed on the copying device 1, the copying date is recorded in the time stamp area 1b, and when the copying is performed again from the copy source apparatus 2 to the copy destination apparatus 1, the time stamp area 1b is checked and copied. If the date satisfies a predetermined condition, the copying process is performed without checking the volume label 1a. Therefore, in the case of re-copying, the volume label is deleted by the medium recovery process as in the conventional example. Therefore, re-copying can be performed efficiently. In addition, there is no danger of accidentally destroying the data of the copy source device during the medium recovery process.

Further, as in the second aspect of the present invention, it is possible to easily determine whether or not recopying is performed by determining whether or not the copying date is within a predetermined time from the copying time. Further, by recording the identifier in the time stamp area as in the invention of claim 3, the time stamp area can be easily determined.

[0013]

FIG. 2 is a diagram showing the recorded contents of a copy destination apparatus according to an embodiment of the present invention. In this embodiment, as shown in FIG. And write the identifier and the copy date. Note that FIG. 9 shows an example in which a time stamp area is provided at the 9994th byte and “TIME” is used as an identifier.

FIG. 3 is a flowchart showing the copying process according to the present embodiment. In this embodiment, when the copying process is performed, an identifier and a copying date are recorded in a time stamp area. That is, as shown in the figure, in step S1, it is determined whether or not the identifier is recorded in the time stamp area. If the identifier is not recorded in the time stamp area, the process goes to step S3 and the volume label is It is determined whether or not there is. If there is no volume label, a copying process is performed in step S4. If there is a volume label, the process ends abnormally.

In step S1, if the identifier is recorded in the time stamp area, the process goes to step S2, where the copy date in the time stamp area is checked to determine whether it is within 24 hours after copying. If the copy date in the time stamp area is within 24 hours after copying,
The process proceeds to step S4 to perform a copying process. If it is not within 24 hours, it is determined in step S3 whether or not there is a volume label. If there is no volume label, a copying process is performed in step S4. If there is a volume label in step S3, the process ends abnormally.

If the copying process is performed in step S4, the identifier and the copying date are written in the time stamp area in step S5, and the process ends. FIG. 4 is a flowchart in the case of performing re-copying in this embodiment.
As shown in the figure, the disk copy program is started in step S1, and the copy date and identifier in the time stamp area of the copy destination device are checked in step S2, as shown in FIG.

If the identifier is found and the copy date is within 24 hours, it is determined that the copy is a re-copy and the process proceeds to step S.
The process goes to step 4 to perform a copying process. If there is no identifier in the time stamp area, or if there is an identifier but the copy date is not within 24 hours, it is determined that the copy is not a re-copy.
In step S3, the volume label of the copy destination device is checked.

In step S3, if there is no volume label, the process goes to step S4 to perform a copying process.
If there is a volume label, the process ends abnormally as abnormal. When the copying process is performed in step S4, the process proceeds to step S5, where the copying date and identifier are written in the time stamp area of the copy destination device, and the process proceeds to step S6.
Ends the disk copying program.

As described above, in this embodiment, the time stamp area is provided in the user unused area of the copy destination apparatus, and when copying is performed, the identifier and the copy date are recorded in the time stamp area. Keep it. When copying (re-copying), the identifier and the copy date are checked.
If the copy is within 24 hours after the copy, the volume label is not checked because the copy is determined to be a re-copy. Therefore, if the copy is performed within 24 hours, it is not necessary to delete the volume label. Processing efficiency at the time of recopying can be improved.

In the above embodiment, after copying, 2
If the time is within 4 hours, the volume label is not checked because it is a re-copy. However, the present invention is not limited to the above embodiment.
Various determinations can be made, such as setting the time shorter or longer than 24 hours or changing the time setting according to the content of the copy.

[0021]

As described above, in the present invention, a time stamp area for recording an identifier and a copy date is provided in a user unused area of a copy destination apparatus, and the time stamp area is checked when re-copying is performed. When the copy date satisfies a predetermined condition, the copy process is performed without checking the volume label. Need not be deleted, and re-copying can be performed efficiently. Further, at the time of the medium recovery processing, there is no danger of accidentally destroying the data of the copy source apparatus, and the reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a diagram showing recorded contents of a copy destination apparatus according to the embodiment of the present invention.

FIG. 3 is a flowchart showing a copying process according to the embodiment of the present invention.

FIG. 4 is a flowchart showing a recopying process according to the embodiment of the present invention.

FIG. 5 is a diagram showing a general system configuration for performing disk copying.

FIG. 6 is a flowchart showing a conventional example of a copying process.

FIG. 7 is a flowchart showing a conventional example of re-copying processing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Copy destination apparatus 1a Volume label 1b Time stamp 2 Copy source apparatus 11 Processing unit 12 Main storage unit 13 Copy source disk 14 Copy destination disk

Claims (3)

(57) [Claims] A volume label (1a) of a copy destination device (1)
Is checked, and in the disk copying method of copying from the copy source device (2) to the copy destination device (1) according to the presence or absence of the volume label (1a), copy at least to the user unused area of the copy destination device (1). A time stamp area (1b) for recording the date is provided, and the copy destination
When copying is performed on (1), the copy date is recorded in the time stamp area (1b), and when recopying from the copy source device (2) to the copy destination device (1),
Check the time stamp area (1b), and if the copy date satisfies the specified conditions, the volume label (1a)
A copying process without performing a check on the disk. 2. When the time stamp area (1b) is checked, if the copy date is within a predetermined time from the copy time, the copy processing is performed without checking the volume label (1a). 2. The disk copying method according to claim 1, wherein: 3. A time stamp area when a copying process is performed.
Record the identifier together with the copy date in (1b), and
3. The disk copying method according to claim 1, wherein when recopying from (2) to the copy destination apparatus (1), the identifier of the time stamp area (1b) is checked.