JPH02312068A - Recording control method - Google Patents

Abstract

PURPOSE:To prevent an undue overwrite by providing a write starting flag for showing the commencement of a data writing, a data recording part and write ending flag for showing the termination of the data writing. CONSTITUTION:Recording data such as a write starting flag part 2, a data part 3 and a write ending flag part 4, etc., are provided with their positioning gap parts 1a, 1b, 1c and 1d between each data to constitute one data block. At the time of writing a data, the data is written by confirming no data write flag, and after its read check, the write ending flag is written in addition. By this method, in case of the occurrence of trouble during the write of a data, if the write ending flag is not written, and hence the write ending flag cannot be confirmed, this block concerned can be recognized as a write error block, so that the undue overwrite can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a recording control system, and in particular, to a recording control system that cannot be rewritten, such as a magnetic disk device or an optical disk device, or a record that must be erased before rewriting. The present invention relates to a recording control method for preventing illegal overrides during data recording in a data recording device.

[Conventional technology]

Conventionally, as a recording control method for data protection in a non-rewritable storage device such as an optical disk device, for example, a control method for a non-rewritable storage device described in Japanese Patent Application Laid-Open No. 1651/63/1980 is known. Are known. The control method for this storage device is such that a written mark is recorded in the area preceding the data section to prevent data destruction. That is, in this control method, a write mark and a gap for absorbing rotation fluctuation are provided between the ID part and the data part of a file record, and when writing, it is confirmed that there is no write mark in the target block before writing. In this control method, a write mark is written during a read check after writing data, a write mark is written in conjunction with data writing, and when reading, it is confirmed that there is a write mark in the target block. .

The control method is such that only a write mark is written during a read check after writing a data block.

[Problem to be solved by the invention]

By the way, in the control method of the recording device described above, only the write mark is written during the read check after writing the data block. If there is, the light mark will not be written.
Therefore, even though the data has already been written,
There is a problem in that the block in question is determined to be unwritten and there is a possibility that an illegal override may occur.

The present invention has been made to solve the above problems.

An object of the present invention is to provide a recording control method that prevents illegal overrides.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[Means to solve the problem]

In order to achieve the above object, the recording control method of the present invention includes a write start flag indicating that data writing has started, a data recording section, and a data writing section in one block in which data is to be recorded. A feature is that data recording is performed by providing a write end flag indicating that the write has ended.

Also, only when both the write start flag and the write end flag are set, it is determined that the block has been written normally, and if only the write start flag 9 is set, the block is judged to have been written successfully. It is characterized by determining that the block has failed and performing error processing.

[Effect]

According to the above means, a write start flag indicating that data writing has started, a data recording section, and a write end flag indicating that data writing has ended are provided in one block for recording data. . When writing data, confirm that there is no data write flag, write the data, check the readout, and then write a write completion flag. For example, if a failure occurs during data writing, If the write end flag is not written and the write end flag cannot be confirmed, the block can be recognized as a write error block, and illegal overrides can be prevented. By providing the write start flag and the write end flag here, for example, in a part other than the data recording section between the gaps, the data storage capacity of the user is not particularly reduced.

〔Example〕

Hereinafter, one embodiment of the present invention will be specifically described using the drawings.

FIG. 1 is a diagram illustrating an example of the format of a write data block according to a recording control method according to an embodiment of the present invention. In FIG. 1, numeral 3 indicates a data portion of a recording area for write data. A write start flag section 2 is provided in an area preceding the data section 3, and a write end flag section 4 is provided in an area following the data section 3. Also,
These write start flag sections 2. Data section 3. Recorded data such as @ writing end flag section 4 etc. are stored in gap sections la, lb, for positioning for reading or writing by the recording device.
lc and ld are provided between each data to constitute one data block.

FIG. 2 is a block diagram showing the configuration of essential parts of a recording control device according to an embodiment of the present invention. In the block diagram of FIG. 2, 6 is a control device.

The control unit M6 includes a processing device interface unit 7゜program memory 8. Microprocessor9. Buffer memory 10. and a device interface section 11. In the control device 6, a microprocessor 9 executes a microprogram and controls a processing device interface control section 7, a memory 8, a buffer 10. When the control device 6, which controls the device interface control section 11 and controls a series of data write processing and data read processing, decodes the command from the processing device 5 via the processing device interface section 7, this command is According to
It controls writing and reading of data to the optical disk device 12.

FIG. 3 is a flowchart showing an example of recording control when writing data. This will be explained with reference to FIG. When writing data, first, in step 31, it is checked whether or not there is a write start flag. If there is a write start flag, it is an area where data has already been written, so error handling is performed to prevent data writing.If there is no write start flag, the process advances to step 32, where the write start flag is written. In step 33, the data section is written to the primary, and in step 34,
Read the written data, check it with the original data, and determine whether there is an error in the next step. If there is an error, perform error processing. If there is no error in the read check, proceed to step The process proceeds from step 35 to step 36, where a write end flag is written and the data write process is ended.

In this way, in this data write process, before writing the data section, the write start flag is checked, and if the flag has not been written, the write start flag is written first, and then data is written. , Then, after completing the data read check, a write end flag is written.

FIG. 4 is a flowchart showing an example of recording control when reading data. As shown in FIG. 3, when data is written normally.

Since a write start flag and a write end flag are recorded, in the case of a read process, the state of the block is determined by checking the write start flag and write end flag.

This will be explained with reference to FIG. In the data read process, first, in step 41, the presence or absence of a write start flag is checked. If there is no write start flag, it can be determined that it is an unwritten data block, so proceed to unwritten block read error processing.If the existence of the write start flag is confirmed in the determination process of step 41,
Next, the process proceeds to step 42, where the data portion is read.

Next, in step 43, it is determined whether or not there is a read error, and if there is an error in the read.

For example, error processing such as retry processing is performed.

If it is determined in the error determination process in step 43 that there is no error and normal read processing is being performed, the first step is to check the write end flag in step 44.The write end flag cannot be confirmed. in case of,
Since the read block is determined to be a write abnormal block, the write abnormal block read error processing is performed. If the write end flag is confirmed in step 44, a normal data block has been read normally, so data read processing is performed. end.

By the way, when applying such recording control to a storage device that requires erasure before rewriting, the write operation is controlled separately from the erase operation, and the write start flag and write end flag are erased only during the erase operation. control so that In addition, by checking the write start flag as shown in FIG. 3 during a write operation, writing to an invalid block can be prevented.

The present invention has been specifically explained above based on examples, but
It goes without saying that the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the spirit thereof.

〔Effect of the invention〕

As explained above, according to the recording control method of the present invention, if a failure occurs during data writing, the write end flag does not exist in the block and the block can be recognized as a write error block. Unwarranted overrides can be prevented.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating an example of the format of a write data block according to a recording control method according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating a configuration of main parts of a recording control device according to an embodiment of the present invention. FIG. 3 is a flowchart showing an example of recording control when writing data, and FIG. 4 is a flowchart showing an example of recording control when reading data. In the figure, la, lb, 1c, ld-gi'r knob, 2...
- Write start flag section, 3... Data section, 4... Write end flag section, 5... Processing device, 6... Control device, 7... Processing device interface, 8... Memory, 9... Microprocessor, 10... Buffer memory, 11... Device interface, 12...
Optical disk device.

Claims (1)

[Claims] 1. A write start flag indicating that data writing has started, a data recording section, and a write end flag indicating that data writing has ended in one block for recording data. A recording control method that records data by providing 2. In the recording control method according to claim 1, only when both the write start flag and the write end flag are set, it is determined that the block has been successfully written, and only the write start flag is set. If you are
A recording control method that determines that a block has failed during data writing and performs error processing.