JPS6148172A - Information write control system - Google Patents

Abstract

PURPOSE:To simplify the rewrite processing and to attain effective utilization of a recording medium by rewriting to a recording medium after interruption of write continuously to a part which is interrupted previously and making a rewrite command nearly the same as the write command at interruption. CONSTITUTION:When an information processor 101 issues a rewrite command, it is decoded by the microprocessor 107 of an information recorder 102. When a command and a parameter are known by the decoding, the microprogram commands data reception to a data buffer circuit 105 and also succeeding processings. The command gives a positioning to a head track number designated by a parameter to the access circuit 109. Then a read/write circuit 106 receiving the command of read start from the head sector number commanded by the parameter starts reading and whether or not the state is in write state is discriminated at each sector and when a non-written sector is detected, the position in the data buffer circuit 105 is commanded to the data buffer circuit 105.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to write control in an information storage device of an information processing system, and particularly to a control method suitable for a rewrite method after write interruption.

[Background of the invention]

In conventional information processing systems, when rewriting an information storage device after writing is interrupted, the information storage device transfers the interrupted arbitrary data block number and error information to the upper information processing device, and the information processing device that received the information and this The instructions for rewriting were reconfigured based on the processing performance of the operating system installed in the computer, and the information storage device received the reconfigured instructions. The disadvantage is that the reconstruction process becomes complicated. In addition, in non-rewritable information storage devices,
The interrupted written information remains on the medium as it is, and it is necessary to rewrite it in a new area, and the process of reissuing instructions becomes complicated even in the process of changing the rewriting position.

(Object of the Invention) The object of the present invention is to provide an information processing device and an information storage device for continuously writing information after the writing of information has been interrupted without rewriting the already written portion. The object of the present invention is to provide a method that simplifies control between devices and a control method that guarantees data regarding both information before interruption and information after interruption.

[Summary of the invention]

In the present invention, when an abnormality occurs during information writing, for example, when the writing is interrupted due to a power cut, the information processing device simply reissues almost the same command as when writing was started, and the information is stored. The device side detects the position where rewriting should start and continues the previously interrupted writing from that position.In addition, during the read check after writing, the information that has already been written is also checked and any defective information is detected. One of the features is that a replacement area is written.

[Embodiments of the invention]

Examples of the present invention will be shown below. FIG. 1 shows a connection state between an information storage device and an information processing device that constitute this embodiment.

In FIG. 1, information to be recorded in the information storage device is sequentially transferred from the information processing device. The information storage device has a recording medium, and the recording format thereof is shown in FIG. The recording format of the recording medium according to this embodiment is composed of a plurality of tracks, and the tracks are divided into a plurality of sectors.

A fixed number of bacts can be written to this sector. Therefore, information is recorded sector by sector. Tracks are numbered from 0 to 2, and sectors within the same track number are 0.
Numbers from y are assigned. Therefore, before transferring information, the information processing device transfers the target track number and sector number to be written, and instructs the information storage device to perform a positioning operation called a seek.

After the seek operation is completed, the information processing device starts transferring write data to the information storage device. Therefore, in order to write information, the information processing device transfers commands, parameters, and write data as shown in FIG. The above parameters are shown in Figure 4 α and b.
The first track number to start writing as shown in
In addition to the sector number and the number of sectors to be written, it has flag information indicating whether it is an initial write operation or a rewrite operation. When this rewrite flag is 01, that is, the state shown in Figure 4 α, it indicates an initial write operation, and when the rewrite flag is 1', that is, the state shown in Figure 4, it is a rewrite operation. It shows that. This initial writing or rewriting operation is instructed by the information processing device. The initial write operation is no different from a conventional write operation. In the present invention, this flag is provided in order to prevent the processing speed of the entire information processing system from decreasing as much as possible.

At the beginning, as shown in Figure 5 α, an attempt was made to write from sector 1 to sector N of an arbitrary track according to the initial write instruction, but for some reason the write operation was stopped when the writing of sectors 1+4 was completed. It has ended. Therefore, writing from sector 1+5 to sector N was not executed. In this situation, the information processing device uses the same command as the first initial write, except for setting the rewrite flag to 1', as shown in Figure 4. , parameters.

Then, write data is prepared and transferred to the information storage device again. When the information storage device decodes this retransferred parameter information as an instruction for a rewrite operation, it initially reads/writes to the specified track number and sector number position.
A seek operation is performed to position the write head. When the seek operation is completed, in order to search for the position where the data should be rewritten, that is, the sector number, a read operation is executed for each sector starting from the data of the first sector number.

As a result of the read operation, the information storage device determines the state of each sector read, ie, whether data has been written.

To determine whether data has been written, for example, if the device uses a magnetic recording method, the number of magnetic flux reversals is counted, or if the device uses an optical recording method, the number of holes is counted, and whether or not it exceeds a certain threshold value is determined. It is done by As shown in FIG. 5 α, each sector read in this way is
If it is determined that the data up to number 5 have been written, and the data starting from number +5 have not been written, it is assumed that the information storage device according to this embodiment uses a rotating recording medium, so that the number 1,005 is written. Wait until the next occurrence and resume writing from the +5th sector. By the way, from the first sector +4
Since the data up to the th sector has already been written, in the rewrite operation according to the present invention, the data transferred from the information processing device includes data from the first sector to the 4th sector. The storage device uses the above-mentioned written/unwritten judgment result to read +4 from the first sector.
Control is performed so that the data of the sector 5 is received but not written to the recording medium, and data is written to the recording medium from sector +5 onwards.

The configuration and operation of the information recording device to which the present invention is applied is explained in the sixth section.
When the information processing device issues an instruction to rewrite 0 as explained with reference to FIG. 7 and FIG. 7, the information recording device receives it through the interface circuit and decodes it by the microprocessor. Upon learning the commands and parameters shown in FIGS. 5 and 4 through this decoding, the microlog 2- instructs the data pan 71 circuit to receive data and at the same time instructs the following processing. This instruction causes the access circuit to first perform a positioning operation to the first track number specified by the parameter. When the access circuit indicates to the microprocessor that the positioning has been completed, the microprogram then instructs the read/write circuit to start multiple read operations from the first sector number designated by the parameter. Upon receiving this instruction, the read/write circuit starts reading and determines whether each sector is unwritten or written. In this operation, since writing has been interrupted first, written sectors are detected at first, but unwritten sectors are detected in the middle. When an unwritten sector is detected, it is indicated to the microprocessor, and the microprogram instructs the data buffer 1 circuit to locate the write data corresponding to the beginning of the unwritten sector within the data buffer circuit. The write data is stored in one data back circuit in the order of reception and has a capacity of one track at most. This allows the data corresponding to the written sector in the data buffer circuit to
The data was simply stored in the data back 7 circuit without being instructed to write. The data buffer 1 circuit is not necessarily necessary for rewriting, and if the data buffer 1 circuit is not provided, the write data is received from the information processing device after detecting the beginning of the unwritten sector and the data is written. It is also possible to only receive data corresponding to completed sectors, inhibit transfer to the read/write circuit, and transfer only unwritten data to the read/write circuit. Thereafter, the writing of unwritten data to the recording medium is instructed one after another, and writing of all data is completed. After writing is completed (reading is performed including sectors that have already been written and sectors that have been rewritten), and replacement data for the defective sector is written to a pre-prepared replacement area for sectors that have caused errors. Write.

By performing the write control as described above, it is possible to make use of previously written data that has been interrupted, and to provide an effective writing method especially for destructive recording media that cannot be rewritten to the same location once written. can. Furthermore, the series of commands issued by the information processing device to instruct rewriting does not need to be particularly conscious of the sector location where it was interrupted at the beginning, and can be simplified by simply changing the parameters indicating initial writing or rewriting. Become. Also,
Data can be guaranteed for the preceding and succeeding sectors, including the interrupted sector.

〔Effect of the invention〕

According to the present invention, rewriting after interrupting writing to a recording medium can be continued to the previously interrupted part, and at the same time, the rewriting instruction can be almost the same as the writing instruction at the time of interruption, so that the rewriting can be performed on the recording medium. Effective use and rewrite processing can be simplified.

Furthermore, if the control method according to the present invention is used to ensure the quality of normal writing on a recording medium with poor writing quality such as an optical disk medium, the information storage device will The written information and the information that was continued to be written after the interruption are read out continuously, the information is checked, and a replacement area is taken for information that results in an error in this read check, ensuring quality during writing. can. In other words, in the rewriting process according to the present invention, since the information before the writing was interrupted is also retransferred, even if an error is detected either before or after the interruption in the reading check after writing, a spare area is easily taken and the information stored therein is easily transferred. This makes it possible to retrieve information that has caused an error without intervening control of the information processing device. Furthermore, according to this control method, for example, if the cause of writing interruption is the information storage device, the above-mentioned control can be carried out even if the recording medium on which writing was interrupted is transferred to another normal information storage device. There is also.

[Brief explanation of the drawing]

Figure 1 is a connection diagram between the information processing device and the information storage device, Figure 2 is an explanatory diagram of the recording format of the recording medium, and Figure 5 is data and control information for writing information between the information processing device and the information storage device. 4 is a detailed diagram of parameter information, FIG. 5 is a state diagram of initial writing and rewriting on a recording medium, and FIG. 6 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 7 is a microprogram flow diagram of an embodiment of the present invention. 102... Information storage device, 103... Recording medium, 1
04... Interface circuit, 105... Data buffer 7 circuit, 106... Read/write circuit, 107... Microprocessor, 109... Access circuit, 110... Access mechanism.

Claims (1)

[Claims] 1. In an information processing system consisting of an information processing device and an information storage device, after the operation of writing information to the information storage device is interrupted, in the rewriting process, the information processing device writes the same write information as the interrupted write operation. An information write control method in which the information storage device re-transfers the data and continues writing the unwritten information after the previous interruption to the place where it was interrupted.