JPS6292105A - Magnetic tape recording method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a recording method at the end of a tape in a magnetic tape device, and particularly to a recording method suitable for a magnetic tape that is not limited by the tape length of the tape end area.

[Background of the invention]

Generally, a magnetic tape device has a starting code 5.5 as shown in FIG. After recording a data block 8 consisting of data 6 and an end code 7, an interblock gap 9 is provided to record continuous data records. An example of this method is JP-A-59-94212. In the recovery process for a write error in recording data block 8, the magnetic tape 1 is returned to the leading edge of the data block 8 where the error occurred, and the interblock gap 9 is extended by erasing the data block 8. Then, the data block 8 is recorded and this process is repeated. If the groove end indicator 2 is detected before or during recording of the data block 8, the detection of the tape end indicator is reported to the processing device at l-, and the end of the tape is recorded according to the instruction from the processing device. Generally, when a write error occurs in the tape end area, error recovery processing is performed, a data block is recorded, and then the end of the tape is recorded.

However, with such conventional methods, the number of attempts for error recovery processing is limited for magnetic tapes that have a limited length at the end of the tape.

Alternatively, it is not possible to record the end of the tape, and as a result, the reliability of the tape is inferior to that of a magnetic tape that has a sufficient tape end area. In particular, whereas 1/2-inch magnetic tape starts at the beginning of the tape and stops at the end of the tape, cartridge magnetic tape starts and stops at the end of the tape due to its structure, which reduces the reliability of writing. Moreover, a negative roll of magnetic tape is often wasted due to write errors that occur in the tape end area.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording method that does not cause a magnetic tape to become defective even if a write error exists in the end area of the magnetic tape.

[Summary of the invention]

When recording on a magnetic tape, when the tape end indicator is recognized while the tape is running, the present invention moves backward by the number of data blocks sufficient to perform a retry and records the end of the tape, and the previously erased data is transferred to the next one. Write to magnetic tape.

[Embodiment of the Invention] An embodiment of the present invention will be described below. FIG. 1 is a block diagram showing the configuration of a magnetic tape control device and a magnetic tape device. 11 is a magnetic tape control device, and an instruction processing circuit 12
．． A control circuit 13 that performs processing at the end of the tape. Performs device interface conversion consisting of the data control circuit 14.

The magnetic tape device 15 is . Instruction processing circuit 16, detection circuit 1
7, a data control circuit 18, a drive device 19 for running the tape; It is comprised of a head 20 connected to the data control circuit 18 and a sensor 21 connected to the detection circuit 17 to identify a tape end indicator. The magnetic tape device 15 executes commands issued from the processing device 10 via the magnetic tape control device 11.

FIG. 2 shows a magnetic tape recording system and an example of its operation. ■ is magnetic tape. 2 is the tape end indicator. 3 is the tape end area, and 4 is the physical tape end. 8 is the starting code 5
, data 6, and termination code 7. 9 is the interlock gap. 23 is the end of the tape. Further, arrow 22 indicates the movement of the head while the tape is running.

below. A recording method performed after the magnetic tape control device l1 detects the tape end indicator 2 upon receiving a write instruction from the processing device lO will be described. The instruction processing circuit 12 of the magnetic tape control device 10 receives a write instruction from the processing device IO shown in FIG. A write command is issued to the magnetic tape device 15. The command processing circuit 16 of the magnetic tape device 15 that receives the write command is activated by the drive device 1 in order to run the tape.
After running 9. Write data to data transfer circuit 18
I swear by this. on the other hand. Detection circuit 1 detects the tape end indicator 2 shown in the second □□□ while the tape is running during a write operation.
7 sends a tape end indicator detection signal to the tape end processing control circuit 13 of the magnetic tape control device 1l. The tape end processing control circuit 13 receives the tape end mark detection signal.
Instructs the data control circuit 14 to terminate data transfer. A rewind command is issued to the magnetic tape device 15 via the command processing circuit l2. At this time. A reversal command is issued for a predetermined number of backward records. After rewinding. The tape end processing control circuit l3 issues a write command. Issued to the magnetic tape device 15 via the instruction processing circuit l2. Data indicating the end of the tape is sent to the magnetic tape device 15 via the data control circuit 14. The operation of the magnetic tape at this time will be explained with reference to FIG. Tape running. When tape end mark 2 is detected (point A).

Tape running stops at point B. Accelerate to the opposite direction (0 point). Skip reading a predetermined number of data blocks and stop at point E.

after that. Accelerate to the forward direction (point F). Create data block 8 indicating the end of data (point G). At this time. For writing instructed by the processing device 10. The magnetic tape controller 11 also reports detection of the tape end indicator. Instructs to record the data block destroyed by creating the end-of-tape data block on the next magnetic tape.

〔Effect of the invention〕

According to the invention. This method records the end of the tape without being affected by the length of the end area of the magnetic tape, so even if there is a write error in the end area of the tape, the magnetic tape will not be marked as defective (and will not be considered defective). This has the effect of maintaining reliability.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a magnetic tape control device and a magnetic tape device showing an embodiment of the invention, FIG. 2 is a diagram showing a magnetic tape recording system and an example of operation, showing an embodiment of the invention, and FIG.
The figure shows a conventional magnetic tape recording system. 1...Magnetic tape, 2...Tape end indicator. 3...Tape end area, 8...Data block. 10... Processing device. 11...Magnetic tape control device. 13... Tape termination processing control circuit. 15...Magnetic tape device, 17...Detection circuit. 22... Head operation, 23... Tape end. Representative Patent Attorney Katsuo Ogawa -1-' No. 1
Figure I 2θ Zl Figure 2 Figure 3

Claims (1)

[Claims] A magnetic tape consisting of a start code, data, an end code, and an interblock gap, on which data records of arbitrary length can be continuously recorded, and upon detecting the end of the tape, it moves backward a predetermined number of blocks, and then A magnetic tape recording method characterized in that the end of the tape is recorded from the leading edge of the start code of the block.