JPH02185764A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To eliminate the need for an exchange between a data in a alternate sector part and a data in a defective sector and hence to omit the time required for executing the data exchange by disposing an alternate sector to a leading part in a track. CONSTITUTION:An optical disk 1 is constituted of plural tracks 10, while the track 10 is also constitutive of plural sectors 20, 21, 22.... Now, the alternate sectors 20, 30, 40... are disposed to the leading part of the track 10 by a command of the information recording and reproducing device. Then, the data in the alternate sector part is reproduced and stored in a prescribed position of a memory in a controller part, and the data from the next sector is stored in the remaining memory part in the controller part, so that the data for one track amt. is built up. By this method, since the exchange between a data of an error part and the data of the alternate part can be excluded at the time of reproducing the data, the time required for executing the data exchange can hence be omitted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information recording and reproducing device, and in particular, an information recording and reproducing device comprising a plurality of tracks on a disc-shaped information recording carrier, and each track comprising a plurality of sectors including alternate sectors. .

The present invention relates to an information recording and reproducing apparatus that replaces a defective sector on each track with a replacement sector on the same track.

[Conventional technology]

An optical disc, which is an example of a disk-shaped information recording carrier, has tracks arranged in a concentric or spiral pattern, and records variable length data.

In order to speed up access, each track is divided into a plurality of sectors, and optical recording and reproduction are performed sector by sector.

Information is recorded by condensing Radhe light emitted from a semiconductor laser onto the recording layer on the disk, and creating recording pits by making holes in the recording area or by changing the reflectance or transmittance. This is done by forming, etc.

The format of data recording density is roughly divided into two types: a CLV method in which the recording bits are recorded on a disk at a constant linear velocity, and a CAV method in which the recording bits are recorded at a constant angular velocity.

In the CAM method, since data is recorded at a constant angular velocity, the data recording density at the outer circumference of the disk is lower than that at the inner circumference, making it inferior in terms of efficient use of storage capacity. Furthermore, the CLV method has the disadvantage that the access time is long because the sectors are not arranged in a radial manner and the number of revolutions varies depending on the position.

Therefore, the MCAV method, which has both the easy access of the CAV method and the advantages of the recording density of the CLV method, has been proposed in Japanese Patent Laid-Open No. 59-167874. That is, the disk is divided into multiple zones in the direction of the rotational radius, and recording is performed at a lower rotational speed toward the outer zone, and recording is performed at a constant rotational speed within each zone, which is a drawback of the CAv method. A method has been proposed that improves the problem that the recording density decreases toward the outer periphery. In addition, as an MCAV method that brings about the same effect, the rotation speed is constant for both the inner and outer zones, the recording and reproducing frequency is increased as you move toward the outer zone, and the frequency is constant within each zone. A method has also been proposed in which the recording density decreases toward the outer periphery by recording and reproducing.

On the other hand, in each of these systems, defects on the disk have various adverse effects during recording and reproduction. Normal information recording and reproducing operations may be interrupted in an incomplete state by causing a detection error in the sector ID part during information recording and reproducing operations, or by causing a tracking error (AT misalignment) during information recording and reproducing operations. Furthermore, errors that exceed the capabilities of the ECC of the optical information recording/reproducing device may occur.

To logically avoid defects, an alternative processing method is generally used, in which a playback operation is performed immediately after the actual recording operation, and when a defective location is detected, the data is rewritten to a predetermined replacement block. There is.

In general, in alternative processing for optical discs, according to the data format on the medium, sectors, tracks, etc. are used as recording/playback units, and layers are layered into each stage, and discs that do not meet the recording quality standards set at each stage are prepared in advance. This is to switch to the replacement block that has been specified.

Now, as replacement sectors, normally the number of sectors in consideration of the error rate of the medium is prepared in advance at the last part of one track. For discs with concentric or circular tracks, the capacity to record is 1.
In the case of a track's worth of data, after recording one track's worth of data and kicking it to the recording start position, the recorded data is checked (hereinafter referred to as verification), and if an error is found, a previously prepared Performs replacement processing for some erroneous sectors in the replacement area.

[Problem to be solved by the invention]

However, if there is a replacement sector at the end, during playback, it is necessary to play one track including the replacement sector and exchange the data in the replacement sector with the data in the sector where the error occurred. The execution time has also been considered a problem.

In view of these problems, it is an object of the present invention to provide an information recording and reproducing device that does not require exchanging data in a replacement sector portion with data in a defective sector, and can therefore omit the time required to perform data conversion. There is a particular thing.

[Means to solve the problem]

In order to achieve the above object, a plurality of tracks are formed on one disk-shaped information recording body, a plurality of sectors including a replacement sector are formed in each track, and a defective sector in each track is replaced with a replacement sector in the same track. An information recording and reproducing apparatus is provided, characterized in that the replacement sector is arranged at the beginning of the track.

〔Example〕

An embodiment in which the present invention is applied to an optical disk device will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing the arrangement of alternate sectors in a track of a disk-shaped information recording carrier (hereinafter referred to as an optical disk) according to this embodiment. Wow, Figure 1 is a schematic diagram.
In an actual record carrier, the left end and right end in FIG. 1 are connected.

Note that when the tracks are formed concentrically, the tracks in each row are connected to each other, and when the tracks are formed in a spiral shape, the tracks in each row are connected to the tracks in the next row.

In the figure, an optical disc 1 has a plurality of tracks 10, and the track 10 also has a plurality of sectors 20, 21.
, 22. It consists of... ζReplacement sector 20
, 30, 40. . . . are placed at the beginning of the track IO according to a command from the information recording/reproducing device.

In this embodiment, one spare sector is provided in one track.

Next, in the information recording/reproducing apparatus according to this embodiment.

The manner in which data is transferred from the optical disk to the host combinator will be explained with reference to FIG. Prior to that, the reproduction operation in the conventional example will first be explained with reference to FIG.

Conventionally, when reproducing one track, the optical head is moved to a desired first sector (8301), the data is reproduced by following the track with a light beam, and the data is stored in the memory of the controller section (S302). Additionally, sector errors are determined at the same time as data reproduction (8303).
. To determine the sector error, use the error correction code added to the user data to determine whether it is within the step 2 correction range (8303). If an error exists after one track has been played, the spare sector at the end of the track is played back, the data is read and temporarily stored in the buffer memory, and then the data in the spare sector and the error part are read. Exchanging data (S305),
An r-record for one track is constructed and the data is transferred to the host combinator (8306).

Next, to explain the operation of the information recording/reproducing apparatus according to this embodiment, after moving the head to the first sector (S201)
, since the replacement sector exists at the beginning of the track, the replacement sector portion is first reproduced (S202). If the replacement sector section is empty (8203), there is no error, so the next sector is played back and stored in the memory of the controller, and one track's worth of playback data is constructed (8205\replacement). If the sector is not empty (S2
03), that is, if an error exists, the data in the replacement sector is reproduced and stored in a predetermined location in the memory of the controller (8204). The predetermined location here refers to a location where data of a sector in which an error exists (defective sector) starting from the next sector is saved.

Then, the data from the next sector is played back and stored in the memory of the controller, and data for one track is constructed (
S205), transfer to host combination ≧-ta (S206
). Note that when reproducing the data from the next sector and storing it in the memory of the controller unit.

The data of the sector in which the error exists is not stored in the memory of the controller unit.

In the Kaya embodiment, the data in the alternate sector is reproduced and stored in a predetermined location in the memory of the controller, and the data from the next sector is stored in the remaining memory of the controller, thereby constructing data. Therefore, the data rearrangement (8305 in the third prisoner) according to the conventional example is omitted, and the software processing time required for data rearrangement is shortened.

In the above embodiment, one spare sector is provided in one track, but it is also possible to provide two or more spare sectors in one trunk. In this case, the replacement sectors are placed side by side at the beginning of the track.

During playback, the data in the spare sector is first played back and stored in a predetermined location in the memory of the controller, and then the data from the next sector is stored in a predetermined location in the remaining memory of the controller. Then, construct the data.

Further, although this embodiment deals with an information recording/reproducing apparatus using an optical disk, the present invention is also applicable to other types of information recording/reproducing apparatus using a disc-shaped information recording carrier.

〔Effect of the invention〕

In the present invention, since the spare sector is placed at the beginning of the track, it is possible to omit exchanging the data of the erroneous part and the data of the spare part when reproducing data. Therefore, the execution time of data exchange is omitted, and the host computer It is possible to speed up data transfer to.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the arrangement of alternate sectors within the tracks of an optical disc in one embodiment of the present invention, FIG. 2 is a flowchart showing the playback operation in the above embodiment, and FIG. 3 shows the playback operation in the conventional example. It is a flowchart. 1... Optical disc, 10... Track, 20, 30
゜40...Replacement sector, 21.22...Information sector agent Patent attorney Seki Yamashita

Claims (1)

[Claims] In the information recording and reproducing apparatus, the disc-shaped information recording carrier has a plurality of tracks, each track has a plurality of sectors including a replacement sector, and a defective sector in each track is replaced with a replacement sector in the same track, wherein the replacement sector An information recording/reproducing device characterized in that: is arranged at the beginning of the track.