JPS6117059B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for handling write errors that occur on a recording medium such as a magnetic tape.

Conventionally, when writing data to a recording medium such as a magnetic tape, a writing error may occur due to a defective medium or the like. In this case, the same data is tried to be rewritten several times to more than ten times by shifting its position, and if writing is still not possible, a cancel code is written. If this cancel code also cannot be written, the magnetic tape is replaced. In any case, the magnetic tape never ends, so the correct data at the beginning is not used, and the data must be input again from the beginning. Normally, data in one file is divided into volumes for each of multiple magnetic tapes, but if a writing error occurs in this volume, it is uneconomical to discard each volume including normal data. .

SUMMARY OF THE INVENTION An object of the present invention is to provide an efficient method for handling write errors on a volume-processed recording medium.

In order to achieve the above object, the medium write error processing method of the present invention attempts rewriting a predetermined number of times when a write error occurs in data on a recording medium, and if normal writing is still not obtained, , returns to the last normal data unit, transfers the contents of the data unit to the buffer memory, writes the end code of the write data unit in the vacant space, and then moves to another recording medium and stores it in the buffer memory first. It is characterized in that a data unit is written, and subsequent data units are sequentially written.

The principle and embodiments of the present invention will be explained in detail below.

FIG. 1 is a diagram explaining the principle of the present invention. As shown in figure a, magnetic tape 1 is used as volume #1.
₁ in a predetermined data unit (1)2 ₁ , (2)2 ₂ ,
(3) By writing 2 ₃ with the write head and reading and checking with the read head, if a write error occurs in data (3) due to a media defect, for example, the position can be shifted and rewritten as described above. You can repeat this several times to more than ten times. However, if writing is still not possible, the present invention skips back to the normal data (2) ₂ , transfers the data (2) 2 ₂ to the evacuation buffer memory and stores it, and then stores it in the empty space. To,
As shown in FIG. 5B, a tape mark (TM) 3 and an end-of-volume code (EOV) 4 are written in a predetermined format indicating that this volume #1 has ended. Next _, as volume # ₂ , as shown in FIG _. , data (4) 2 ₄ , . . . are sequentially written, and finally a tape mark (TM) 3 and an end of file code (EOF) 5 are written. If a write error occurs, the same process as described above is performed.

In this way, in the past, when a write error occurred, the magnetic tape of that volume could not be used and was discarded together with the normal data written on it, but with the present invention, this can be rescued and an efficient A write error handling method can be realized.

FIG. 2 is an explanatory diagram showing the configuration of an embodiment of the present invention based on the above-mentioned principle.

In the figure, data input from an information source through a line control section 10 is controlled by a data control section 11 and temporarily stored in a reception register 12. Then, the write data is sent to the write register 13 via the control signal generation circuit 15, and
A write signal is generated and sent to the write control circuit 17. Here, write data from the write register 13 is applied to the write head of the magnetic tape device 18 in response to the write signal, and the magnetic tape is driven by the drive signal to perform writing. Next, the data written on the magnetic tape is read out by the read head, inputted to the comparator circuit 20 via the read control circuit 19, and written into the write register 1.
3, and if they do not match, an error signal is sent to the data control unit 11. Through this control, rewriting control is performed on the data stored in the reception register 12, and the writing is performed by shifting the position according to the same procedure as described above. This rewriting can be repeated a predetermined number of times. In addition, the previous normal data content of the write register 13 is stored in advance in the withdrawal register 14, and if the aforementioned predetermined number of rewrites ends in failure, an error signal from the comparator circuit 20 is received. Under the control of the data control section 11, the contents of the withdrawal register 14, that is, the final normal data, are passed through the data control section 11, passed through the write/read control circuit 21, and stored in the withdrawal buffer section of the memory 22. Then, the end of volume code (EOV) stored in the memory 22 is read out,
The data is stored in the reception register 12 through the data control unit 11, and the control signal generation circuit 15 sends a backskip signal to the write control circuit 17 to return the write head of the magnetic tape device 18 to the beginning of the last normal data block. Signal generation circuit 15
The end of volume code (EOV) to be written is sent to the write register 13 via the control signal generation circuit 15, and the write signal is sent to the write control circuit 17,
The EOV is applied to the write head of the magnetic tape device 18 via the write control circuit 17 along with tape marks from the tape mark generation circuit 16 provided before and after the EOV, and is stored in the location where the last normal data of the magnetic tape was stored. Ru. This completes magnetic tape volume #1.

Next, a header mark is first recorded in the magnetic tape volume #2 in the same manner as when writing normal data, and then the contents of the withdrawal buffer in the memory 22 are read out by the write/read control circuit 21, and the data control unit 11 through the receiving register 12
is stored in Thereafter, writing is performed on the magnetic tape by the write head of the magnetic tape device 18 according to the procedure described above. Thereafter, subsequent data is sequentially written by the CPU 10 in the same manner, and if a write error occurs, it is processed in the manner described above.

Although a magnetic tape has been described in the embodiment, the present invention is not limited to this, and the present invention can be applied to any recording medium that can be easily recorded, reproduced, and erased.

As explained below, according to the present invention, when a writing error occurs in data on a recording medium, rewriting is attempted a predetermined number of times, and if normal writing is still not obtained, the final normal After returning to the data unit, transferring the contents of the data unit to the buffer memory, and writing the end code of the write data unit in the vacant space, moving to another recording medium and writing the data unit originally stored in the buffer memory. , the subsequent data units are sequentially written. As a result, when file data is recorded across multiple volumes of media, if a writing error occurs in one volume, it can be saved by discarding the unfinished data including normal data, and the media can be saved. It is useful for effective use.

[Brief explanation of the drawing]

1A to 1C are explanatory diagrams of the principle of the present invention, and FIG. 2 is an explanatory diagram showing the configuration of an embodiment of the present invention. In the figure, ₁₁ , ₁₂ are magnetic tapes, ₂₁ , ₂₂ , 2 ₃
... is a data unit, 3 is a tape mark, 4 and 5 are end signals, 10 is a line control section, 11 is a data control section, 12 is a reception register, 13 is a write register, 14 is a withdrawal register, 15 is a control signal generation 16 is a tape mark generation circuit, 17 is a write control circuit, 18 is a magnetic tape device, 19 is a read control circuit, 20 is a comparison circuit, 21 is a write/read control circuit, and 22 is a memory.

Claims (1)

[Claims] 1 If a writing error occurs in the data on the recording medium, try rewriting a predetermined number of times, and if normal writing still cannot be obtained, return to the last normal data unit and write the contents of that data unit. After transferring the data to the buffer memory and writing the end code of the write data unit to the empty space,
1. A medium write error handling method, characterized in that the data unit stored in the buffer memory is first written to another recording medium, and subsequent data units are sequentially written.