JPH02141973A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To make defect relieving probability as a while into satisfactory one by forming one logical track by rounding the prescribed number of sectors and improving the defect relieving probability of an outer peripheral side zone. CONSTITUTION:An information recording and reproducing device 1 has an optical disk as a recording medium and is formed with an SCSI adapter 12, an MPU 13, a ROM 4, a RAM 15, an ECC circuit 16, an I/O control part 17, and a read/write part 18. Here, the MPU 13 controls the reproducing device 1 based on the program of the ROM 14 and executes substitution processing for a defective sector, and the circuit 16 detects the defective sector, in which information is recorded, in the optical disk. Further, the read/write part 18 executes information recording/reproducing for the optical disk, and a host computer 11 controls the device 1. Here, when one track is composed by rounding the prescribed number of sectors, the defect relieving probability of the substitution processing to be executed for each logical track is uniformized. Thus, when the information is to be recorded or reproduced, the defect relieving probability of the outer peripheral side zone can be heightened, and the defect relieving probability as a while can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information recording/reproducing apparatus for recording or reproducing information on a recording disk having an information recording area having a sector structure.

[Prior Art] Generally, in an optical disk, recording tracks are provided concentrically or spirally, and each track is divided into a plurality of sectors in order to record variable length data and to speed up access. Optical recording and reproduction is performed in units of sectors.

In an information recording/reproducing device using such an optical disk as a medium, a laser beam emitted from a semiconductor laser is focused onto a recording layer on the optical disk, and holes are made in the recording layer, reflectance, etc. Information is recorded by forming recording pits with varying transmittance.

In such an information recording/reproducing apparatus, there are two methods for recording data: a CAV method in which recording pits are formed on a recording track at a constant angular velocity, and a CLV method in which recording pits are formed at a constant linear velocity.

In the CAV method, since recording is performed at a constant angular velocity, the recording density on the outer circumference side of the disk is lower than on the inner circumference side, and is inferior to the CLV method in terms of efficient use of recording capacity.

On the other hand, the CLV method has the drawback that the access time is long because the sectors are not radial and the rotation speed varies depending on the recording position.

Therefore, for example, in Japanese Patent Application Laid-Open No. 59-167874, MCAV is a method that combines the easy access of the CAV method and the superior recording density of the CLV method.
A method has been proposed.

In other words, the MCAV method divides the disk in the radial direction into multiple zones, and records at a lower rotational speed toward the outer periphery, thereby increasing the recording density toward the outer periphery, which was a disadvantage of the CAV method. This is an improvement on the point that the value is low.

In addition, as an MCAV method that has the same effect as this,
A method has also been proposed in which the rotational speed on the inner and outer peripheries is kept constant, and recording is performed by increasing the recording/reproducing frequency toward the outer periphery.

By the way, defects on a disc may have various adverse effects during recording and reproduction. For example, a normal information recording/reproducing operation may be interrupted in an incomplete state due to a detection error in the sector ID part during information recording/reproducing operation or a tracking error (AT misalignment) during information reproduction. Furthermore, it may cause an error that exceeds the ability of the error control function of the information recording/reproducing device.

Therefore, in order to eliminate such errors, it may be possible to conduct an inspection to completely detect defects on all recording surfaces of all discs before shipping them, but this method is disadvantageous in terms of cost. be. In addition, in write-once recording media such as ordinary optical discs, information recorded once cannot be erased in principle, so data for defect detection is recorded and inspected before shipping as described above. It is not possible.

Therefore, in order to logically avoid such defects on the disk, alternative processing methods are essential.

That is, in this alternative processing method, after the actual recording operation, a reproduction operation or an error check operation is immediately performed, and when a defective portion is detected, the block is rewritten to a predetermined replacement block. In general, in alternative processing for optical discs, according to the data format on the optical disc, sectors, tracks, etc. are used as units of recording and playback, and are hierarchically divided into stages corresponding to the degree of defects, such as the number of defective parts, and the settings are set at each stage. If a recording quality standard cannot be met, the block is replaced with a pre-prepared replacement block.

[Problems to be Solved by the Invention] However, in a configuration in which one replacement sector is prepared in a track consisting of multiple sectors, 1) the number of data in the rack is different in each zone, so one track may be defective; The disadvantage was that the relief probability was very low in the outer zone.

An object of the present invention is to provide an information recording and reproducing apparatus that can improve the overall defect remediation probability by increasing the defect remediation probability of the outer peripheral zone when recording and reproducing information using the MCAV method. purpose.

[Means for Solving the Problems] The present invention provides an information recording and reproducing apparatus using the MCAV method, in which a recording disk is divided into a plurality of zones in the radial direction, and recording is performed by lowering the rotational speed toward the outer peripheral zone. , a predetermined number of sectors are grouped together to form one logical track.

The present invention also provides an information recording and reproducing apparatus using the MCAV system, in which a recording disk is divided into a plurality of zones in the radial direction, and recording is performed by increasing the recording and reproducing frequency toward the outer peripheral zone. as a group l
It is characterized by configuring a logical track.

[Function] In the present invention, in the MCAV type information recording and reproducing apparatus, since one logical track is configured by grouping a predetermined number of sectors, the defect recovery probability of the substitution process performed for each logical track is equalized. Ru. Therefore, when recording and reproducing information, it is possible to increase the probability of defect relief in the zone on the outer circumferential side, and it is possible to improve the probability of defect relief as a whole.

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

The information recording and reproducing apparatus 1 of this embodiment uses an optical disc as a recording medium, and includes an SC3I adapter 12. MPU
13, ROM14, RAM15°ECC circuit 16. I1
0 control unit 17. It has a read/write section 18. Further, this information recording and reproducing device l includes a host computer 1
1.

The MPU 13 controls the information recording and reproducing apparatus 1 as a whole based on the program in the ROM 14, and also performs replacement processing for defective sectors generated on the optical disk.

Furthermore, the ECC circuit 16 performs a check to detect defective sectors when information is recorded on the optical disc.

Further, the read/write unit 18 records and reproduces information on the optical disc, and includes an optical disc rotation control unit, an optical pickup device drive control unit, a recording/reproduction signal processing circuit, etc. There is.

This embodiment employs the MCAV method, in which the recording area of the optical disc is divided in the radial direction to form a plurality of annular zones, and recording is performed by lowering the rotational speed from the inner zone to the outer zone. are doing.

FIG. 2 is a schematic diagram showing the configuration of the physical track 2 of the optical disc in this information recording/reproducing apparatus.

In this FIG. 2, three zones 1O120, 30 are shown. The innermost zone 10 has ten sectors 3 in one physical track 2a, and the second zone 20 has ten sectors 3 in one physical track 2a.
has 11 sectors 3 on one physical track 2b, and the outermost zone 30 has 12 sectors 3 on one physical track 2c.
It has 3 sectors.

Furthermore, replacement sectors 3a (shaded areas in FIG. 2) for performing alternative processing are commonly allocated to each zone, one every 10 sectors. Therefore, in zone 10 where one physical track has 10 sectors, one
The 0th sector 3 is secured as a replacement sector 3a.

In addition, in zone 20 where one physical track has 11 sectors,
In the innermost physical track 2b of this zone 20, the 10th sector 3 becomes the replacement sector 3a, but in the outer physical track 2b, the 9th sector 3 becomes the replacement sector 3a, and in the outer physical track 2b, the 9th sector 3 becomes the replacement sector 3a. The physical position of the replacement sector 3a in the circumferential direction is shifted by one sector every l physical track, such that the eighth sector 3 becomes the replacement sector 3a. Furthermore, in zone 30, the number of sectors in l physical track 2C is one more than in zone 20, so the replacement sector 3a is arranged at a position shifted by two sectors in the circumferential direction for every l physical track 2C.

In this embodiment, as described above, the exchange sector 3a
One logical track 4 is configured by IO sectors from the physical track 2 where .

FIG. 3 is a schematic diagram showing the configuration of this logical track 4. As shown in FIG.

As can be seen from FIG. 3, the outer zones 20, which were arranged at different positions for each physical track in FIG.
．． Thirty replacement sectors 3a are arranged in order in each logical track 4 at the 10th position in each logical track 4, as well as the replacement sectors 3a of the inner zone IO.

Therefore, the burden on the software for managing the alternative processing by the exchange sector 3a can be significantly reduced.

Note that the present invention is not limited to one or more embodiments. For example, the number of sectors of the logical track is made to match the number of sectors of the physical track (10 sectors) in the innermost zone 10, but as long as this is not, also the logical track is l
The exchange sector when it is set as O sector is placed in the 10th position, but it may be placed in the 1st or 5th position.
Furthermore, the present invention is not limited to an information recording and reproducing apparatus using an optical disk as a recording medium as in the above embodiment, but can be applied to an apparatus using other information recording media that performs recording and reproducing in units of sectors.

[Effects of the Invention] According to the present invention, in the MCAV type information recording and reproducing apparatus, since one logical track is configured by grouping a predetermined number of sectors, when recording and reproducing information, the zone on the outer circumference side This has the effect of improving the defect relief probability of , and improving the defect relief probability as a whole.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a schematic diagram showing the configuration of physical tracks of an optical disc used in the apparatus of the embodiment. FIG. 3 is a schematic diagram showing the configuration of logical tracks of an optical disk used in the apparatus of the embodiment. 1... Information recording/reproducing device, 2a, 2b, 2c... Physical track, 3... Sector, 3a... Exchange sector, 4... Logical track, 10.20.30... Zone. Figure 1

Claims (4)

[Claims] (1) In an MCAV information recording and reproducing device that divides a recording disk into multiple zones in the radial direction and performs recording by lowering the rotational speed toward the outer zone, a predetermined number of sectors are grouped together. An information recording/reproducing device characterized in that one logical track is configured as one logical track. (2) In an MCAV information recording and reproducing device, which divides a recording disk into multiple zones in the radial direction and performs recording by increasing the recording and reproducing frequency toward the outer zone, a predetermined number of sectors are An information recording/reproducing device characterized in that one logical track is configured as a group. (3) The information recording/reproducing apparatus according to claim (1) or (2), characterized in that a replacement sector is arranged in the one logical track. (4) In at least one of claims (1), (2), and (3), the number of sectors in one logical track is made equal to the number of sectors in one physical track in the inner peripheral zone of the recording disk. An information recording and reproducing device characterized by: