JPH0795388B2 - Information recording method - Google Patents

Description

The present invention relates to a method of recording information in an information recording / reproducing apparatus.

[Conventional technology]

Conventionally, there are magnetic disk devices, optical disk devices, magneto-optical disks, and the like as information recording / reproducing devices, but in the following description, the optical disk device will be described as an example.

FIG. 4 is a plan view showing a format of an optical disc used in the optical disc device. Optical disc is composed of, as shown in the figure, the address portion a ₀ ~a _n, sector s comprising data unit d ₀ ~d _{n 0} ~s _n.

In order to record or reproduce information in the target sector, the address part of the sector is reproduced, and if the address of the sector coincides, the information in the data part of the sector is reproduced or the information is recorded in the data part. . Therefore, if there is a defect in the address part of the sector and the address cannot be reproduced,
Since it becomes impossible to access information to the sector, accurate recording of information on the optical disc may become impossible, or recorded information may not be reproduced, resulting in loss of recorded information.

Therefore, conventionally, for example, the format of each sector is changed to the fifth format.
As shown in the figure, a plurality of address section IDs are provided to deal with destruction of the address section.

In the figure, 1 indicates the start position of each sector SM (sec
tor mark), 2 ₀ , 2 ₁ , ..., 2 _n-1 , 2 _n are the address part of each sector, ID (identifier), 3 is a GAP that absorbs disk rotation fluctuation, and 4 is the synchronization timing of the following field. SYNC (synchronization mark) indicating 5 and AM (adrress
mark), 6 is a data area for recording information, and 7 is an error correction code ECC (error correctin) for reducing the error rate.
g code), 8 is GAP. In addition, each address part ID _{0 to} ID _n
(N ≧ 0) is 9 SYNC, 10 AM (adrres mark), 11
TN (track number), 12 SN (sector number), 1
It is composed of 3 CRCs (cyclic redency codes) and 14 GAPs.

The CRC13 can be used to enable or disable the reproduction of the address information, and the correctness of the address information can be confirmed by the CRC13 in real time.

FIG. 6 shows a flow chart for reproducing address information in the conventional example.

The reproduction of the address portion ID conventional example, to check the correctness of the address information ID ₁ is the CRC code, repeatedly one after the other operation that reproduces the ID ₂ to be irreproducible, ID ₀ ~
When reproduction of all IDs of ID _n is impossible, it is judged that the reproduction of the address information of the sector is impossible, the recording to the sector is abandoned, and the replacement sector is provided.

[Problems to be solved by the invention]

However, in the conventional method as described above, the sector is treated as a defective sector for the first time only when the reproduction of all of the plurality of address sections ID _{0 to} ID _n is impossible, so that the following problems occur. Was there.

This is because, when information is recorded in a sector, the number of defects in the address part is large, and in the extreme case, when one address part is left and all other address parts are defective address parts, the address information from the remaining one address part is used. Since information can be reproduced, the information is recorded in the sector, and when the information is reproduced from the sector, the defect state of the remaining one address portion deteriorates and the reproduction of the address information becomes impossible. Therefore, it is impossible to reproduce information from the sector.

[Means for solving problems]

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide an information recording method in which the risk that the address information cannot be reproduced is much smaller than in the prior art.

The above object is to provide a method for recording information on a recording medium having a plurality of sectors, each of which has a plurality of address portions each consisting of address information and a CRC for determining whether the address information can be reproduced or not. Prior to recording information on the desired sector, CRC is used to determine whether the address information can be reproduced or not for each of the plurality of address sections provided in this sector. When there are a certain number or more of possible address parts, an alternative sector of the sector is provided, and the information to be recorded in the desired sector is recorded in the alternative sector.

[Work]

According to the information recording method of the present invention as described above, since the information is recorded in the replacement sector without fail in the dangerous sector in which the number of defective address portions is a certain number or more, the reproduction of the address information is unsuccessful. It is possible to prevent the loss of recorded information due to becoming possible.

〔Example〕

Hereinafter, the information recording method according to the present invention will be described based on specific examples.

According to the information recording method of the present invention, when information is recorded in a sector having a plurality of address parts, the address information is reproduced from all the address parts, the number of address parts in which the address information cannot be reproduced is counted, and the defective address part is recorded. When the number of the above is larger than a certain number compared to the total number, the sector is treated as a defective sector or a quasi-defective sector, a spare sector is provided, and information is recorded in the spare sector.

It should be noted that the number of defective address areas to be treated as defective sectors or quasi-defective sectors should be determined in consideration of the total number of address areas and the defect occurrence rate of the recording medium to which the present invention is applied.

FIG. 1 is a schematic block diagram showing a configuration example of an information recording / reproducing apparatus for executing the information recording method of the present invention.

In the figure, 20 is a host interface, 21 is a track buffer, 22 is an ECC, 23 is a modulation circuit, 24 is a laser drive circuit, 25 is an optical head, 26 is a light beam from the head, 27 is a linear motor, 28 Is a recording medium such as a disk, 29 is a spindle motor, 30 is an AT (auto trackkin)
g), AF (auto focusing) circuit, 31 is head amplifier, 32
Is a demodulation circuit, 33 is an address regenerator, 34 is a counter, 35 is a comparator, and 36 is a controller.

FIG. 2 is a diagram showing a flowchart of the present invention.

FIG. 2 illustrates the flowchart with reference to FIG. 1 and the aforementioned FIG. 5 showing the format of the sector.

When recording information in the data portions 6 and 7 of the sector, first, the address portion ID _k is reproduced (step S1 in FIG. 2) by the address reproducing circuit 33, and the address information is accurately reproduced by checking the CRC13. If (YES in step S2), the count of the counter circuit 34 is incremented by 1 (step
S3), reproduction of all address information ID _{0 to} ID _n address information provided in the sector (loop of steps S1 to S5).

After the reproduction of the address information recorded in all the address parts ID _{0 to} ID _n is completed (YES in step S4), the counter number and the reproduced address information are respectively supplied from the counter circuit 34, the address reproducer 33 to the comparator 35. To (step S6). The comparator 35 compares the correctly reproduced count number with a predetermined predetermined counter number (step S7), and if the correctly reproduced count number is less than the predetermined count number (step S7). (NO in S7), it is determined whether the replacement sector needs to be set (step S8), and if it is necessary (YES in step 4 S8), replacement sector processing is performed (step S9). Further, when the count number in which the address information is accurately reproduced is equal to or larger than the predetermined count number (step S7
YES), the address part is regarded as valid, and if the address information is a predetermined sector to be recorded (YE in step S10).
S), information is recorded in the sector (step S1
1).

In the flow chart of the present invention shown in FIG. 2, when the information is recorded in the sector and the count number at which the address information is accurately reproduced is less than the predetermined count number (NO in step S7 in FIG. 2), Although the sector is regarded as a defective sector and the replacement sector processing is performed, if even one piece of address information from the address section provided is correctly executed, it is regarded as the quasi-defective sector and processed as the quasi-defective sector. It is also possible to do.

FIG. 3 is a diagram showing such a flow chart of the present invention. The basic idea of this embodiment is the same as that of the embodiment shown in FIG.

In the case of the present embodiment, when the correctly reproduced count number is not 0 (NO in step S9 in FIG. 3), the address information can be reproduced, so that the reproduced address information matches the address of a predetermined sector. If you do (Step S10 in Fig. 3)
YES), the information of the sector is recorded (step S in FIG. 3).
11), a spare sector is further provided, and information is recorded in the spare sector (step S12 in FIG. 3). When the correctly reproduced count number is 0 (YE in step S9 in FIG. 3)
S), address information cannot be reproduced from the address part. In this case, when it is necessary to provide a replacement sector (YES in step S13 in FIG. 3), a replacement sector is provided and information is recorded in the replacement sector (step S12 in FIG. 3).

〔The invention's effect〕

As described above, when recording information in a sector having a plurality of address parts, the address information is reproduced from all the address parts, the number of correctly reproduced address information is counted, and the counted number is counted. When the number is less than a certain number, the sector is regarded as a defective sector or a quasi-defective sector, a replacement sector is provided for the sector, and information is recorded in the replacement sector, so that the recorded information cannot be reproduced due to the address information reproduction failure. It has become possible to reduce the risk of becoming.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing a configuration example of an information recording / reproducing apparatus for executing the information recording method of the present invention, and FIGS. 2 and 3 are flow charts showing the procedure of the information recording method of the present invention. is there. FIG. 4 is a diagram showing the format of the optical disc, and FIG. 5 is a diagram showing the format of the sector. FIG. 6 is a flowchart showing the information recording process of the conventional information recording / reproducing apparatus. 2 ₀ , 2 ₁ , ... 2 _n-1 , 2 _n : Address part, 33: Address regenerator, 34:
Counter circuit, 35: comparator, 36: controller.

Claims (1)

[Claims] 1. A method of recording information on a recording medium having a plurality of sectors, each of which comprises a plurality of address portions each consisting of address information and a CRC for judging whether the address information can be reproduced or not. Prior to recording information on a sector, it is determined whether the address information can be reproduced or not using CRC for each of the plurality of address areas provided in this sector, and as a result of the judgment, the address information cannot be reproduced. When there are a certain number or more of address parts, an alternate sector of the sector is provided, and the information to be recorded in the desired sector is recorded in the alternate sector.