JPH0468432A - Magnetic tape device - Google Patents

Abstract

PURPOSE:To simply know the contents of a magnetic tape whose contents are unknown by writing index data in the head of the magnetic tape, at the time of writing the data in the magnetic tape. CONSTITUTION:A data name and the block number for showing an ordinal number of data of a magnetic tape with regard to its data are generated as an index data 2 by an index generating part 1. When write of data is finished by a magnetic tape writing device and rewinding of the magnetic tape is finished, a magnetic tape controller 3 outputs an instruction for writing the index data 2 in the head part of the magnetic tape as an index data label to a magnetic tape reading/writing device 4, and the magnetic tape reading/writing device 4 writes the index data 2. In such a way, the contents of the magnetic tape can be known.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic tape device for reading and writing data on a magnetic tape.

[Conventional technology]

FIG. 4 is a block diagram showing the configuration of a conventional magnetic tape device, and FIG. 6 is an explanatory diagram showing the configuration of data recording on a conventional magnetic tape.

In the figure, (3) is a magnetic tape control device, (4) is a magnetic tape read/write device, and (6) is an I B G (Int
er BlockGap ), (8) is recorded data.

Next, the operation will be explained. In a magnetic tape device having the configuration shown in FIG. 4, when writing data to a magnetic tape, the magnetic tape controller (3) sends a message to the magnetic tape controller (4) as shown in FIG. Block (data) (8) and block (data) (8) in order of block number.
), a command is issued to write data (8) while writing the identification IBG (6), and upon receiving this command, the magnetic tape read/write device (4) actually writes the data (8) onto the magnetic tape. Write IBG(6).

Also, when reading from a magnetic tape, the magnetic tape controller (3) sends an I/O signal to the magnetic tape read/write device (4).
B G (6), issues a command to read the data (8) of the specified block number, and upon receiving this command, the magnetic tape reading device (4) reads the actually necessary data (
8) is read from the magnetic tape.

FIG. 5 is a flowchart showing the above operation.

[Problem to be solved by the invention]

Conventional magnetic tape devices are configured as described above, so when reading data from a magnetic tape, it takes time to obtain the block number of the data to be read from a magnetic tape with unknown contents or a magnetic tape with an unknown block number. As a result, there was a problem in that it took a long time to read the data.

This invention was made to solve the above-mentioned problems. When writing data to a magnetic tape, index data (data name and block number) is written at the beginning of the magnetic tape, thereby preventing unclear contents. An object of the present invention is to obtain a magnetic tape device that allows the contents of a magnetic tape to be easily known.

[Means to solve the problem]

The magnetic tape device according to the present invention includes an index creation unit that creates index data indicating the correspondence between data names and block numbers written on the magnetic tape, control of reading and writing of data and index data onto the magnetic tape, and read index data. The system is equipped with a magnetic tape control device that controls the display of the contents of the index data on the display device, and a display device that displays the contents of the read index data.

[Effect]

In the magnetic tape device of the present invention, when writing data to a magnetic tape, the index creation section creates index data indicating the correspondence between data names and block numbers, and the magnetic tape control device provides data and index information to the magnetic tape read/write device. It controls reading and writing of data and displays the contents of the read index data on the display device, and the display device displays the contents of the read index data.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a magnetic tape device according to an embodiment of the present invention, and FIG. 3 is an explanatory diagram showing the configuration of data recording on a magnetic tape according to an embodiment of the present invention.

In the figure, (1) is index data (
2), the index creation unit (3) issues commands to the magnetic tape read/write device (4) to read and write data and index data, and also commands to display the contents of the index data on the display device (5). (4) is the magnetic tape read/write device that actually reads and writes data and index data in response to commands from the magnetic tape control device (3); (5) is the content of the read data (2); (7) is an index data label of a magnetic tape on which index data is written.

Next, the operation will be explained. When writing to a magnetic tape in a magnetic tape device configured as described above, the index creation unit (1) creates index data (2) with a data name and a block number indicating the data number on the magnetic tape. do. Data is written to a magnetic tape writing device (
4) When the rewinding of the magnetic tape is completed,
The magnetic tape control device (3) issues a command to the magnetic tape read/write device (4) to write the index data (2) at the beginning of the magnetic tape as an index data label (7), and the magnetic tape read/write device (4) writes the index data Write (2).

Also, when reading magnetic tape, the magnetic tape control device (
3) issues a command to read the index data from the index data label (7) and display it on the display device (5) to the magnetic tape read/write device (4) and the display device (5).

The magnetic tape read/write device (4) that received the command reads index data from the index data recorder (7), and also reads the index data from the index data recorder (7).
displays the contents of the index data.

The magnetic tape read/write device (4) also reads actual data according to commands from the magnetic tape control device (3).

FIG. 2 is a flowchart showing the above operation.

Also, in the above embodiment, the case where index data indicating the data name and block number in the magnetic tape is obtained from the magnetic tape is shown, or the function is to obtain the block number of the data to be read from the index data and read the data from that block number. By adding , it becomes possible to read data from magnetic tape by simply specifying the data name.

〔Effect of the invention〕

As described above, according to the present invention, when a user reads data from a magnetic tape, the user can know the contents of the magnetic tape because the index of the magnetic tape is written at the beginning of the magnetic tape. The effect of reducing the number of operations and speeding up data reading can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a magnetic tape device according to an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of the magnetic tape device of FIG. 1, and FIG. An explanatory diagram showing the recording configuration of a tape; FIG. 4 is a block diagram showing the configuration of a conventional magnetic tape device; FIG.
The figure is a flowchart showing the operation of the magnetic tape in Figure 4;
FIG. 6 is an explanatory diagram showing a conventional magnetic tape recording configuration. In the figure, fl) is an index creation unit, (2) is index data, (3) is a magnetic tape control device, (4) is a magnetic tape read/write device, (5) is a display device, and (6) is an I B G.
(Inter BlockGap). In addition, (7) is the index data label, (8) is the data, and the same symbols indicate the same or equivalent parts.

Claims (1)

[Claims] an index creation unit that creates index data indicating a write data name and a block number indicating the data number of the magnetic tape when writing data on the magnetic tape; A magnetic tape comprising a magnetic tape control device that controls additional recording and reading on a label and display of the contents of the previous index data label on a display device, and a display device that displays the contents of the previous index data label. Device.