JPH03288376A - Magneto-optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To remain the history of error information in a non-volatile state by providing an area to record error information history on a magneto-optical recording medium and writing error information into this area. CONSTITUTION:Host system 9, 10...11 are connected to a magneto-optical recording and reproducing device 1, and a host identification number setting register 4 is provided to write intrinsic numbers A, B...(n). On the other hand, an internal error information buffer 5 is provided to store the error information detected by the device 1, and a pointer register 6 is provided to show the number of a register to store the error information. At one part of a medium 2 to be read/written by the device 1, an error information history area 8 is provided corresponding to each host system. The medium 2 is equipped with a pointer recording area 7 for host system identification to show which host system obtains the error history area. Then, the device 1 writes the error information into the area 8 coincident with the identification number of the host system.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magneto-optical recording and reproducing device for reading and writing information on a removable rewritable medium.

[Prior Art J] Conventionally, error information detected by a magneto-optical recording/reproducing device is configured to be stored in a volatile memory within the device, and the information is stored in a host system that accesses the magneto-optical recording/reproducing device when an error occurs. The information was retained until it was read.

[Problems to be Solved by the Invention] However, in the conventional example described above, since error information is recorded in a volatile memory, there is a drawback that when the power is turned off, the error history up to that point is lost. Further, if the host system does not read error information for a long time, the volatile memory becomes full and there is a drawback that no further error information can be obtained.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magneto-optical recording and reproducing apparatus that can properly retain the error information history described above without imposing a burden on memory capacity.

[Means for Solving the Problems] The present invention provides an area for recording the error information history of the magneto-optical recording and reproducing device on the medium of the magneto-optical recording and reproducing device, and stores the error information detected by the magneto-optical recording and reproducing device as the error information. It is characterized by writing in the information history area.

Furthermore, the present invention provides a single magneto-optical recording/reproducing device with an area for recording error information history corresponding to each host system based on identification numbers set by a plurality of host systems. It is characterized in that error information detected during command operation is written in the error information history area.

Furthermore, the above error information is written to the volatile memory in the device, and when this volatile memory becomes full or when there is a request from the host system to write the contents of the volatile memory to the above medium, the volatile memory The present invention is characterized in that the contents of the memory are written into the error information history area.

[Operation] In the present invention, an area for recording error information history is created on the magneto-optical recording medium, and error information detected by the magneto-optical recording/reproducing device is sequentially written to the error information history area, or - once the error information is written in the volatile memory. By writing the error information written into the error information history area, it becomes possible to leave the history of error information detected by the magneto-optical recording/reproducing device in a non-volatile state.

In addition, if the magneto-optical recording/reproducing device is connected to multiple host systems, the error information history area is created for each host system based on the identification number that the host system sets for the magneto-optical recording/reproducing device. By creating a log, it is possible to distinguish and manage the error history that occurred during the command operation of each host system.

[Example] FIG. 1 is a block diagram showing an embodiment of the present invention.

In this magneto-optical recording and reproducing device, the CPU 3 that controls the operation of the entire device and the unique number of the host system that selects the magneto-optical recording and reproducing mail are written. There is a host identification number setting register 4 that identifies whether the memory is being used, and an internal knee information buffer 5 that stores error information detected by Ml on the magneto-optical recording medium (in this case, the register is 6).
(The number of registers is arbitrary) and a pointer register 6 indicating the register number in which error information detected by the device 1 is stored.

In the illustrated example, the host identification number setting register 4 indicates that the host system A has selected a magneto-optical recording/reproducing device, and the pointer register 6 indicates the register number of the buffer 5 in which the error information is stored. 5 out of 5
It shows that.

Medium 2 read and written by this magneto-optical recording and reproducing device
A part thereof is provided with an error information history area 8 corresponding to each host system.

Furthermore, the magneto-optical recording/reproducing device l has a pointer recording area 7 for host system identification number for recognizing which host system the error history area belongs to, and the error history area is a pointer recording area 7 for host system identification number. Write error information in the matching error information history area 8. Normally, this area (host system identification number pointer storage area and error information history area) is created when formatting the medium.

In the example shown in FIG. 1, n host systems are connected to a magneto-optical recording/reproducing apparatus l. The first host system A9 has an identification number A. Further, the next host system BIO has an identification number B. Furthermore, the last host system 11 has an identification number n. This example shows a case where areas for systems A and n were created at the time of medium formatting, but an area for system n was not created.

FIGS. 2(1) to 2(3) are flowcharts illustrating the operation of the apparatus of this embodiment using the example of FIG.

After the power-on sequence, the magneto-optical recording/reproducing device l is logically connected to the host system, and the host system individually stores an area on the medium for managing the error history in order to newly secure or restore the area on the medium. Set the identification number. This value is written to the host identification number setting register 4 in the device. Therefore, the device reads this identification number (si) and determines whether or not the identification number is set (S2). If it is set, it proceeds to S3; if it is not set, it uses the conventional internal error information buffer. In order to use a method of recording error information only in the memory, the process stops securing the error history area on the medium and restoring operations, clears only the error pointer register 6 and internal error information buffer 5, and shifts to main processing (S9. 5tO).

Next, in S3 to S6, it is determined from the group of identification number pointers created on the medium whether or not there is an identification number that is the same as the identification number set by the host system (for example, in the case of systems A and B). If there is one, the error history area 8 on the medium indicated by the identification number is returned to the internal error information buffer (S8), and the process proceeds to the main process. If there is no match (system n in the example), the area has not been secured yet, so new host system identification number pointer area and error history area are allocated (S7, S8).
), move to main processing.

When an error occurs during the main processing, an error signal a is input to the CPU 3 during the main processing, and the CPU 3 shifts the processing from the main processing to the error processing.

In this error processing, first the error pointer register 6 is read (S11), and the error pointer reaches max (
In other words, it is checked whether the buffer 5 is full) (S12), and the error pointer is max
If not, the register with the number indicated by the error pointer in buffer 5 is already set, and the error information is sent to signal C.
When the error pointer is max, the contents of the current internal error information buffer 5 are written to the error information history area (S13), and the error pointer register 6 and internal error information buffer 5 are cleared. After that (S14.515), the current error information is written to the internal error buffer 5, and the error pointer is advanced by one (516 to 518).

Additionally, when the host system is switched during main processing, the current contents of the internal error buffer 5 are written to the error history area, and processing starts again from Sl (S19~
521).

In the above embodiment, the error information is temporarily stored in the internal error buffer 5 and written to the error information history area of the medium as necessary, but it is written to the error information history area of the medium sequentially every time an error occurs. It may also be a configuration.

[Effects of the Invention] As explained above, according to the present invention, an area for recording error information history is provided on the magneto-optical recording medium, and by writing error information in this area, the magneto-optical recording and reproducing apparatus can It becomes possible to leave a history of detected error information in a non-volatile state.

Therefore, by recording the details of the error before the power is turned off when the device fails, an important source of information can be obtained for subsequent analysis of the cause of the failure.

According to one aspect of the present invention, an area for recording error history for each host system is individually provided on the medium, and each time the internal error buffer becomes full, the contents are recorded in the above-mentioned area,
Clearing the error buffer has the effect of always recording the latest error in the error buffer even when errors occur frequently.

5... Internal error information buffer, 6.7...Pointer register, 8...Error information history area, 9-11...Host system.

Claims (4)

[Claims] (1) In a magneto-optical recording and reproducing device that reads and writes information on a removable rewritable medium, an area is provided on the medium to record error information history of the magneto-optical recording and reproducing device, and errors detected by the magneto-optical recording and reproducing device are provided. A magneto-optical recording/reproducing device characterized in that information is written in the error information history area. (2) In claim (1), when the detected error information is written to a volatile memory within the device, and when this volatile memory becomes full, or the host system writes the contents of the volatile memory to the medium, 1. A magneto-optical recording and reproducing apparatus characterized in that the contents of the volatile memory are written into the error information history area when there is a request to write the error information. (3) In a magneto-optical recording and reproducing device that reads and writes information on a removable rewritable medium, information is sent to each host system based on the identification number set by multiple host systems on the medium of one magneto-optical recording and reproducing device. 1. A magneto-optical recording and reproducing device characterized in that an area is provided for recording a corresponding error information history, and error information detected during command operation from each host system is written in the error information history area. (4) In claim (3), the detected error information is written to a volatile memory within the device, and when this volatile memory becomes full, or the contents of the volatile memory are written from the host system to a medium. A magneto-optical recording/reproducing device characterized in that the contents of a volatile memory are written into the error information history area when a request is made.