JPH08180603A - Magnetic tape processing device - Google Patents

Abstract

PURPOSE: To unnecessitate the storage of error log information of a magnetic tape medium on a paper or a disk and to individually manage an error log of each magnetic tape medium by recording the error log of the magnetic tape medium on a medium to be accumulated. CONSTITUTION: An error log recorded on a loaded magnetic tape medium is written in a storage part 9 by an error log reading means A. A notice of an error from an error detecting part 6 under execution of data reading and writing processing is judged by a medium error detecting part 8, and when its origin is ascrubed to the magnetic tape medium, the error information is recorded and accumulated in the storage part 9. The error log in the storage part 9 is sent out to a central processing unit 1 by an error log writing means B upon receipt of an error log reading command, and the error log in the storage part 9 is recorded on a magnetic tape medium upon receipt of a command of unloading the magnetic tape medium.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape processing device, and more particularly to a magnetic tape processing device for managing an error log of a magnetic tape medium.

[0002]

2. Description of the Related Art Conventionally, error log management of this type of magnetic tape medium is performed by recording error information detected regarding reading or writing of recorded information on the magnetic tape medium in a storage device in a central processing unit. I am doing it.

FIG. 5 is a block diagram showing an example of a conventional error log management apparatus for a magnetic tape medium.

In FIG. 5, a magnetic tape unit 3 is connected to a central processing unit 20 via a magnetic tape processing unit 21. The central processing unit 20 has a storage device 22.
The magnetic tape processing device 21 includes a magnetic tape read / write control circuit 23 for controlling tape running and reading / writing data from / to the magnetic tape device ₃ , and the magnetic tape device _3.
Signals and data to the magnetic tape device 3
Yes reception unit 5 for receiving signals and data, an error detection unit 6 for detecting an error signal and data from the magnetic tape unit _3, a _recognizing BOT recognizing section 7 that the magnetic tape medium is in the BOT from are doing.

Next, the operation of the magnetic tape processing apparatus shown in FIG. 5 will be described.

When an error occurs in the magnetic tape device 3, a signal indicating the error occurrence is sent to the error detection unit 6 via the transmission / reception unit 5. Further, when an error occurs in _the input / output data of the magnetic tape device, _the error detection unit 6 detects the error. Error detection unit 6 that has detected an error
The error information is read by the magnetic tape read / write control circuit 23.
_The central processing unit 20 is notified _via . Central processing unit 2
0 cumulatively records the notified error information in the storage device 22 (hereinafter, the cumulatively recorded error information is referred to as an error log file), and causes an error to the magnetic tape device 3 via the magnetic tape read / write control circuit 23. There Ru _to perform the operation when that occurred again. If the error occurs more than a certain number of times, or if the error occurs frequently,
When the central processing unit 20 _causes the magnetic tape device 3 to rewind the magnetic tape medium _and the BOT recognition unit 7 recognizes the BOT of the magnetic tape medium, the input / output is stopped.

Further, a conventional data recording / reproducing / apparatus reads data in a unit recording area recorded on a recording medium immediately after recording, as shown in, for example, a data recording / reproducing apparatus disclosed in Japanese Patent Laid-Open No. 2-179973. When a recording error is detected, the data corresponding to a predetermined number of recording areas including one or a plurality of adjacent recording areas recorded before the unit recording area in which the error is detected is detected as the error. By recording on the recording medium after a predetermined number of unit recording areas after the unit recording area has elapsed, it is possible to prevent the recording data from being unreadable due to a defective portion of the recording medium. It is in operation.

FIG. 6 is a block diagram showing an example of a data recording / reproducing apparatus proposed in the above-mentioned Japanese Patent Laid-Open No. 2-179973. In this example, a rotary head type digital audio tape recorder (R-DAT) 51 is used.
Is used as an auxiliary storage device of the external computer 66.

When data from the external computer 66 is recorded on the magnetic tape medium 64, the external computer 6
The data from 6 is provided to interface 52 via line L1. The data on the line L1 is image information, audio information, arithmetic processing information in the external computer 66, etc., and is an information unit for two tracks on the magnetic tape medium 64 ( _{details will be described later.} Hereinafter, this information unit is referred to as a frame). Output). One frame includes, for example, 5120 bytes of data, and the external computer 66 divides each frame and outputs it.

Such data is stored in the interface 5
2 to the memory 53 such as a random access memory via the line L2, and the data supplied to the signal processing circuit 57 via the line L3 includes R-DAT.
The parity and frame number in 51 are added,
The added data such as the parity is given to the amplifier 58 via the line L4. The data signal amplified by the amplifier 58 is sent to the recording head W1 via the line L5 by the synchronizing signal synchronized with the rotation of the rotary cylinder 59 _, which is sent from the synchronizing circuit 63 via the line L14.
It is switched to the recording head W2 via the line L6 and given, and recorded on the magnetic tape medium 64.

The magnetic heads W1 _and W2 and the reproducing heads R1 _and R2, which will be described later _, have a cylindrical rotating cylinder 5
There on 9, _arrow 67 about the axis by the motor 56
It is driven to rotate in the direction indicated by. At this time, the servo circuit 55 is controlled by the control signal from the control circuit 54 to cause the motor 5 to move.
6 to control the rotation speed. The magnetic tape medium 64 is
An arrow 68 is drawn by a capstan motor (not shown) or the like.
The vehicle is traveling in the direction indicated by. Magnetic tape medium 64
Is in contact with the side surface of the rotary cylinder 59 at an angle of 90 °, for example. The recording heads W1 and W2 trace the magnetic tape medium 64 in an oblique direction to form frames (not shown). A frame number (not shown), which is a sequential number, is recorded as identification information in each frame. When recording the same data, the same frame number is recorded.

The data recorded on the magnetic tape medium 64 is sent from the synchronizing circuit 63 through the line L14 by the reproducing heads R1 and R2 individually corresponding to the recording heads W1 and W2, as in the above-described writing. It is read by switching with a synchronizing signal. The signals from the reproducing heads R1 and R2 are given to the amplifier 60 via the lines L7 and L8, respectively. At this time, the reproducing heads R1 and R2 respectively reproduce the data of the frames formed by the corresponding recording heads W1 and W2.

The data signal amplified by the amplifier 60 is applied to the synchronizing circuit 61 via the line L9, and the synchronizing circuit 61 synchronizes with the clock signal from the clock generating circuit 65. The output from the synchronization circuit 61 is supplied to the signal processing circuit 62 via a line L10, the in the signal processing circuit _{6 2,} the correction of errors due to the added parity signal processing circuit 57 is performed. Signal processing such as error correction at this time is performed by the synchronization circuit 63.
Signal processing such as parity addition in the signal processing circuit 57
_It is done synchronously with.

The data output from the signal processing circuit 62 is sent to the interface 5 described above via the line L12.
Given to 2. In the normal interface 52, data is stored in the memory 53 via the line L2, then the data is read from the memory 53, and the line L13 is read.
Output to the external computer 66 via.

The data from the external computer 66 is stored in the memory 53 and given to the signal processing circuit 57. The data to which the parity or the like is added in the signal processing circuit 57 is recorded on the magnetic tape medium 64. The data reproduced by the reproducing heads R1 and R2 is the signal processing circuit 6
2, the signal processing circuit 57 performs signal processing including correction of data error due to the added parity and determines whether the data error can be corrected. If the error in the data can be corrected, that is, if the data is recorded normally, the next data is input.

When the data cannot be corrected, that is, when it is determined that the error in the data of the frame cannot be corrected because the magnetic tape medium 64 has a defective portion such as a scratch, the external computer 66. Stop inputting data from.

The data D1 (not shown) immediately preceding the data D2 (not shown) for which error correction was not possible is read from the memory 53 and re-recorded. Signal processing circuit 62
In, signal processing including error correction of the data D1 by parity is performed. During this time, data is sequentially read from the memory 53 and recorded as frames on the recording medium. Next, it is determined whether the error of the re-recorded data D1 can be corrected. If the error cannot be corrected, the data D1 is re-recorded again. If the error can be corrected, the next data is input from the external computer 66. In this way, when the error in the recorded data cannot be corrected, re-recording is performed after the data recorded immediately before the data.

According to this example, when the R-DAT 51 is used as an auxiliary storage device of the external computer 66,
When an error in data generated due to a defective portion of the magnetic tape medium 64 is detected during recording, the data recorded immediately before the detected data is also rerecorded.

When reproducing the thus recorded magnetic tape medium 64, the reproduced data for each frame is temporarily stored in the memory 53, and at the time of outputting, the frame number of the data to be output is predetermined. Do not output the data after the number of frames.

In this example, the R-DAT has been described, but it is not necessary to limit to the R-DAT and the invention can be implemented in a storage device such as a cassette tape recorder or a video cassette tape recorder.

[0021]

In the error log management of the magnetic tape medium _{by the} conventional magnetic tape processing device, when the error log file on the storage device in the central processing unit is erased or the contents of the error log file are lost. If
Alternatively, when the magnetic tape medium is used in another computer system, there is a problem that an error log regarding the magnetic tape medium cannot be known.

Further, in the conventional data recording / reproducing apparatus,
When the occurrence of an error in recording data is detected during the recording operation, the data in which the error is detected and the one or more data recorded immediately before the data are re-recorded on the recording medium. Although it is possible to prevent the data loss due to the defect of the recording medium, there is a problem that the history of the recording error of the recording medium cannot be known.

[0023]

A magnetic tape processing apparatus according to the present invention is a magnetic tape running control for a magnetic tape apparatus.
_{And a} magnetic tape read / write control circuit capable of reading / writing data and reading / writing data at a position opposite to the BOT of the magnetic tape medium,
The transmitted signals and data with respect to a magnetic tape device, a transceiver for receiving signals and data from the magnetic tape device, an error detector to detect an error signal and data from _the magnetic tape device, _the magnetic The BOT recognition unit that recognizes that the data read / write position of the magnetic tape medium in the tape device is at the BOT, the medium error detection unit that detects an error caused by the magnetic tape medium, and the initial value is set to "0". And the initial value "0" is "1"
Have the error log flag indicating that the error log is stored by being replaced, and stores the detected error by _the media error detection unit and the storage unit, _the
And error logs reading means for writing an error log stored on a magnetic tape medium in a magnetic tape apparatus in _the storage unit,
Characterized that _you and _a error log write means for writing the error log of _the storage unit on a magnetic tape medium in _the magnetic tape device.

[0024]

The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

In FIG. 1, the present embodiment is an external storage device.
A central processing unit 1 having a function _{of inputting data from an external storage device and outputting data to an external storage device} , a magnetic tape _medium is loaded, data is recorded on the magnetic tape medium, and _{data is} read _{from the} magnetic tape device. It is composed of a magnetic tape device 3 having a function, and a magnetic tape processing device 2 having a function of operating the magnetic tape device 3 in response to an instruction from the central processing unit 1 and relaying input / output of data.

Further, the magnetic tape processing device 2 controls the tape running _and reads / writes data to / from the magnetic tape device, _and can read / write data at a position opposite to the BOT of the magnetic tape medium. A write control circuit 4, a transmission / reception unit 5 that transmits a signal or data to the magnetic tape device 3 and receives a signal and data from the magnetic tape device 3, and detects an error in the signal and data from the magnetic tape device 3. The error detection unit 6, the BOT recognition unit 7 that recognizes that the magnetic tape medium is in the BOT, the medium error detection unit 8 that detects an error caused by the magnetic tape medium, and the initial value is "0".
Is set to “0” and the initial value “0” is replaced with “1” to have an error log flag 10 indicating that an error log exists in the storage unit 9, and the error detected by the medium error detection unit 8 is stored. Storage unit 9, an error log reading unit A that writes the error log stored in the magnetic tape medium to the storage unit 9, and an error log writing unit B that writes the error log of the storage unit 9 into the magnetic tape medium. Consists of

The error log reading means A receives the signal from the BOT recognizing section 7 and receives the interrupt signal receiving section 11 for outputting the notification signal and the notification signals from the interrupt signal receiving section 11 and others, and outputs the error log flag 10 Error log operating means 12 for confirming the value and changing the value, control circuit operating means 13 for instructing the magnetic tape read / write control device 4 to operate the magnetic tape medium in the magnetic tape device 3, and magnetic tape read / write. A storage unit writing unit 14 that writes the error log read by the control circuit 4 into the storage unit 9 is configured.

The error log writing means B is a control circuit operating means 15 for instructing the magnetic tape read / write control device 4 to operate the magnetic tape medium in the magnetic tape device 3.
And an error log operating means 16 for outputting the error log of the storage unit 9 to the central processing unit 1 and the magnetic tape read / write control circuit 4, and an error log operating means for confirming the value of the error log flag 10 and changing the value. And 17.

FIG. 2 shows a magnetic tape medium including the error log recording section 18.

FIG. 3 is a flow chart showing an operation procedure in the error log reading means A of FIG.

[0032] The operation of this embodiment will be described with reference to _FIGS.

First, when the operator loads a magnetic tape medium on the magnetic tape device 3, the magnetic tape device 3 detects the BOT of the magnetic tape medium and notifies the BOT recognition section 7. When the BOT recognition unit 7 receives the notification of BOT detection,
An interrupt signal is output to the error log reading means A.

The operation of the error log reading means A will be described. _The error log reading means A, as shown in the flowchart of FIG. 3, when an interrupt signal receiving unit 11 receives an interrupt signal from the BOT recognition unit 7 (step A1), the interruption signal receiving unit 11 is an error log flag operation means 12 is notified (step A2), and the error log flag operating means 12 confirms whether the error log flag 10 stored in the storage unit 9 is set to the initial value “0” (step A2).
3) If the error log flag 10 is set to the initial value "0" (step A4), the error log operating means 1
2 notifies the control circuit operating means 13 (step A5),
The control circuit operating means 13 instructs the magnetic tape reading / writing control circuit 4 to record the error log recording section 18 of the tape medium.
_The error log is read from _{(FIG. 2)} and the storage unit writing means 1 is read.
4 (step A6), the storage unit writing means 14 writes the error log received from the magnetic tape read / write control circuit 4 in the storage portion 9, and notifies the error log operating means 12 when it has finished (step A6). A7), the error log flag processing means 12 notifies the control circuit operating means 13 after changing the value of the error log flag 10 to _" 1" (step A8), and the control circuit operating means 13 causes the magnetic tape read / write _control circuit _{4 to} operate. In response to this, a command for returning the read / write position of the tape medium in the magnetic tape device to BOT is issued (step A9).

[0035] Magnetic tape unit_ThreeReading data against
During the writing process, the error detection unit 6 receives signals and
If an error is detected in the data, the error is
6 to magnetic tape read / write control circuit 4 and medium error
The detection unit 8 is notified. The medium error detection unit 8
The error notified by the detection unit 6 is due to the magnetic tape medium
Determine whether or not the cause is the magnetic tape medium
If it is determined that the error information is recorded in the storage unit 9 and accumulated.
It An instruction to read the error log is issued from the central processing unit 1.
The magnetic tape read / write control circuit 4,
The error log writing means B is notified.

Next, the operation of the error log writing means B will be described. FIG. 4 is a flow chart showing an operation procedure in the error log writing means B in FIG.

[0037] _In the error log write unit B, as shown in the flow diagram of FIG. 4, an error log operation means 16 receives a command error log read from the central processing unit 1 (step B1), the error log operation means 16 The error log flag operating means 17 is notified (step B2), and the error log operating means 17 confirms the value of the error log flag (step B2).
3) _{As a} result, if the value of the error log flag is set to "1" (step B4), the error log operating means 1
6 sends the error log of the storage unit 9 to the central processing unit 1 (step B5). When the central processing unit 1 issues an instruction to rewind and release the magnetic tape medium from the mounted state after the reading and writing of data to the magnetic tape unit 3 is completed, an error log is written via the magnetic tape reading and writing control circuit 4. The means B is notified. _The error log writing unit B, and the error log operation unit 16 receives the notification (step B6), the error log operation unit _{16 notifies} the control circuit operating means 15 (Step B7), BOT recognized from BOT recognition section 7 Is received (step B8),
The control circuit operating means 15 notifies the error log operating means 16 (step B9), and the error log operating means 16 sends the error log of the storage section 9 to the magnetic tape read / write control circuit 4 and then notifies the control circuit operating means 15. Then, the control circuit operating means 15 commands the magnetic tape read / write control circuit 4 to overwrite the sent error log in the error log recording section 18 of the tape medium (step B11), and the error log The operating means 16 erases the error log in the storage unit 9 and then sets the value of the error log flag 10 to the initial value via the error log flag operating means 17.
_It is set to _" 0" (step B12).

[0038]

As described above, according to the present invention, by recording and accumulating the error log of the magnetic tape medium on the medium, it is not necessary to store the error log information of the magnetic tape medium on paper or a disk, and the magnetic tape The error log of the medium can be managed for each individual medium, and even if the magnetic tape medium is used in another computer system, the error log information can be easily grasped and defects of the magnetic tape medium can be isolated. to _bring out the effects.

[Brief description of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a block diagram showing contents of a magnetic tape medium mounted in the magnetic tape device of FIG.

FIG. 3 is a flow chart for explaining the operation of an error log reading means in FIG.

FIG. 4 is a flow chart for explaining the operation of an error log writing unit in FIG.

FIG. 5 is a block diagram of a conventional example.

FIG. 6 is a block diagram showing _another conventional example.

[Explanation of symbols]

 1 central processing unit 2 magnetic tape processing unit 3 magnetic tape unit 4 magnetic tape reading / writing control circuit 5 transmission / reception unit 6 error detection unit 7 BOT recognition unit 8 medium error detection unit 9 storage unit 10 error log flag 11 interrupt signal reception unit 12 error Log flag operating unit 13 Control circuit operating unit 14 Storage unit writing unit 15 Control circuit operating unit 16 Error log operating unit 17 Error log flag operating unit 18 Error log recording unit A Error log reading unit B Error log writing unit

Claims (3)

[Claims] 1. A magnetic tape read / write control circuit capable of performing magnetic tape running control _and reading / writing of data with respect to a magnetic tape device, _and reading / writing of data at a position opposite to a BOT of a magnetic tape medium. the transmitted signals and data with respect to a magnetic tape device, a transceiver for receiving signals and data from the magnetic tape device, an error detector to detect an error signal and data from _the magnetic tape device, _the magnetic The BOT recognition unit that recognizes that the data read / write position of the magnetic tape medium in the tape device is at the BOT, the medium error detection unit that detects an error caused by the magnetic tape medium, and the initial value is set to "0". The error value is stored by replacing the initial value “0” with “1”. Have Rarogufuragu, a storage unit for storing a detected error in _the media error detection unit, and an error log reading means for error log stored on the magnetic tape media in _the tape device writes in _the storage unit, magnetic tape processing apparatus according to claim that _you and _a error log write means for writing the error log of _the storage unit on a magnetic tape medium in _the magnetic tape device. Wherein said error log reading means, an interrupt signal receiving section for receiving an interrupt signal from the BOT recognition unit, and error logs flag operation means can be confirmed _and manipulate the value of the error log flag, _the Control circuit operating means for instructing the magnetic tape read / write control circuit to read the data recorded in the reverse direction from the BOT of the magnetic tape medium in the magnetic tape device and return the read / write position of the magnetic tape medium to the BOT. And storage unit writing means for writing the error log read by the magnetic tape read / write control circuit in the storage unit.
Magnetic tape processing apparatus according to claim 1, characterized in that _{it has.} 3. The error log writing means writes an error log in the storage unit to the central processing unit and the magnetic tape reading / writing control circuit in response to an instruction from the central processing unit and the magnetic tape reading / writing control circuit, respectively. delivery, and storage unit read hand _stage that can erase data in the storage unit, with respect to the magnetic tape read write control circuit,
Writing means for issuing an instruction to write error log data in the storage section at a position opposite to the BOT _{of the} magnetic tape medium _{in the} magnetic tape device; and error log flag operating means for confirming and operating the value of the error log flag. The magnetic tape processing apparatus according _to claim 1, further comprising: