JP2651612C - - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for managing an information recording / reproducing apparatus which records or reproduces information on a recording disk having an information recording area having a sector structure. [Related Art] Generally, in an optical disc, recording tracks are provided concentrically or spirally, and from the viewpoint of recording variable-length data and speeding up access,
Each track is divided into a plurality of sectors, and optical recording and reproduction are performed in units of these sectors. In such an information recording / reproducing apparatus using such an optical disk as a medium, a laser beam emitted from a semiconductor laser is focused on a recording layer on the optical disk, and a hole is formed in the recording layer, or the reflectance or transmittance is reduced. Information is recorded by forming recording pits so as to change the rate. In such an information recording / reproducing apparatus, there are a CAV method in which recording pits are formed at a constant angular velocity on a recording track and a CLV method in which recording pits are formed at a constant linear velocity, as modes for recording data. In the CAV method, since recording is performed at a constant angular velocity, the recording density on the outer peripheral portion side is lower than that on the inner peripheral portion of the disk, and it is inferior to the CLV method in efficient use of recording capacity. On the other hand, the CLV method has a drawback that the access time becomes long because the sectors do not become radial and the number of revolutions differs depending on the recording position. Therefore, for example, Japanese Unexamined Patent Publication No. Sho 59-167874 proposes an MCAV system which has both easy access of the CAV system and excellent recording density of the CLV system. In other words, in the MCAV system, the disk is divided into a plurality of zones by dividing the disk in the radial direction, and recording is performed at a lower rotational speed toward the outer periphery. Is improved. As an MCAV method having the same effect, a method has been proposed in which the number of rotations in the inner and outer circumferences is kept constant, and recording is performed by increasing the recording / reproducing frequency toward the outer circumference. By the way, defects on the disc may have various adverse effects during recording and reproduction. For example, an incorrect information recording / reproducing operation may be interrupted in an incomplete state by causing a detection error of the sector ID part in the information recording / reproducing operation, or causing a tracking error (AT deviation) during the information reproducing. Further, an error may be caused that exceeds the error control function of the information recording / reproducing apparatus. Therefore, in order to eliminate such errors, it is conceivable to perform an inspection for completely detecting defects on all recording surfaces of all disks before shipping the disks, but there is a problem in terms of cost. is there. In addition, in a write-once recording medium such as a normal optical disk, once recorded information cannot be erased in principle, it is necessary to record defect detection data and perform the above-described inspection before shipment. Can not. Therefore, in order to logically avoid such a defect on the disk, an alternative processing method is indispensable. In other words, in this alternative processing method, a reproduction operation or an error check operation is performed immediately after an actual recording operation is performed, and when a defective portion is detected, the data is rewritten to a predetermined replacement block. In general, in the alternative processing on the optical disc, according to the data format on the optical disc, sectors and tracks are used as recording / reproducing units, hierarchized into stages corresponding to the degree of defects, such as the number of defective portions, and set in each stage. Those which cannot satisfy the recording quality standard are replaced with exchange blocks prepared in advance. [Problem to be Solved by the Invention] However, in a configuration in which one exchange sector is prepared in a track composed of a plurality of sectors, the number of data in one track is different in each zone, so that one track of defect relief is provided. There is a disadvantage that the probability becomes lower in the zone on the outer peripheral side. The present invention provides a management method of an information recording / reproducing apparatus which can improve the defect remedy probability as a whole by increasing the defect remedy probability of the zone on the outer peripheral side when recording / reproducing information by the MCAV method. The purpose is to do. Means for Solving the Problems According to the present invention, a recording disk is divided in a radial direction into a plurality of zones, and the number of sectors in one physical track increases from an inner zone to an outer zone. In the management method of the information recording and reproducing apparatus of the recording method of performing recording so that the increase
Exchange sectors are arranged so that the ratio between the total number of sectors and the total number of exchange sectors in each zone is constant. [Operation] In the present invention, in the MCAV system, the replacement sectors are arranged so that the ratio between the total number of sectors and the total number of replacement sectors in each zone is constant, so that the defect remedy probability of the substitution process in each zone is maintained. Is made uniform. Therefore, when recording and reproducing information, the defect relieving probability of the zone on the outer peripheral side can be increased, and the defect relieving probability as a whole can be improved. Embodiment FIG. 1 is a block diagram showing an embodiment of the present invention. The information recording / reproducing apparatus 1 of this embodiment uses an optical disk as a recording medium, and includes a SCSI adapter 12, an MPU 13, a ROM 14, a RAM 15, an ECC circuit 1
6, an I / O control unit 17 and a read / write unit 18. The information recording / reproducing apparatus 1 is controlled by a host computer 11. The MPU 13 controls the information recording / reproducing apparatus 1 as a whole based on a program stored in the ROM 14 and performs a process of replacing a defective sector occurring on the optical disc. The ECC circuit 16 performs a check for detecting a defective sector when information is recorded on the optical disc. Further, the read / write unit 18 is for recording and reproducing information on and from the optical disk, and includes a rotation control unit for the optical disk, a drive control unit for the optical pickup device, a recording / reproduction signal processing circuit, and the like. I have. In this embodiment, the recording area of the optical disc is divided in the radial direction to form a plurality of zones in an annular shape, and the MCAV system is employed in which recording is performed at a lower rotation speed from the inner zone to the outer zone. doing. FIG. 2 is a schematic diagram showing a configuration of a physical track 2 of an optical disc in the information recording / reproducing apparatus. In FIG. 2, three zones 10, 20, 30 are shown. The innermost zone 10 has ten sectors 3 on one physical track 2a, the second zone 20 has eleven sectors 3 on one physical track 2b, and the outermost zone 30 Has 12 sectors 3 in one physical track 2c. In addition, an exchange sector 3a (hatched portion in FIG. 2) for performing the substitution process is assigned to one sector every ten sectors in each zone. Therefore, in zone 10 in which one physical track has ten sectors, the tenth sector 3 of each physical track 2a is secured as an exchange sector 3a. In a zone 20 in which one physical track has 11 sectors, the tenth sector 3 is an exchange sector 3a in the innermost physical track 2b of the zone 20, but a ninth sector 3 is in the outer physical track 2b. The replacement sector 3a, and the physical position in the circumferential direction of the replacement sector 3a is shifted by one sector per physical track, such that the eighth sector 3 becomes the replacement sector 3a in the outer physical track 2b. It will be. In addition, zone 30
Since the number of sectors in one physical track 2c is one more than that in the zone 20, the replacement sector 3a is arranged at a position shifted by two sectors in the circumferential direction for each physical track 2c. In this embodiment, one logical track 4 is composed of ten sectors from the physical track 2 in which the exchange sector 3a is arranged as described above. FIG. 3 is a schematic diagram showing the configuration of the logical track 4. As can be seen from FIG. 3, in FIG. 2, the replacement sectors 3a of the outer zones 20 and 30, which have been shifted from one physical track to another,
In this case, like the exchange sector 3a of the inner zone 10, the logical tracks 4 are arranged at the tenth position in order. Therefore, the load on software for managing the replacement process by the exchange sector 3a can be greatly reduced. Note that the present invention is not limited to the above embodiments. For example, the number of sectors in one logical track is made equal to the number of sectors (10 sectors) in the physical track of the innermost zone 10. However, the present invention is not limited to this. In addition, although the replacement sector is arranged at the tenth when the number of the logical tracks is ten, it may be the first or the fifth. Further, the present invention is not limited to the information recording / reproducing apparatus using an optical disk as a recording medium as in the above embodiment, but can be applied to an apparatus using another information recording medium which performs recording / reproducing in units of sectors. [Effects of the Invention] According to the present invention, in the MCAV system, replacement sectors are arranged such that the ratio of the total number of sectors in each zone to the total number of exchanged sectors is constant, thereby enabling replacement processing in each zone. Can be uniformed, so that the overall defect remedy probability can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a schematic diagram showing a configuration of a physical track of an optical disk used in the apparatus of the embodiment. FIG. 3 is a schematic diagram showing a configuration of a logical track of an optical disc used in the apparatus of the embodiment. DESCRIPTION OF SYMBOLS 1 ... Information recording / reproducing apparatus, 2a, 2b, 2c ... Physical track, 3 ... Sector, 3a ... Exchange sector, 4 ... Logical track, 10, 20, 30 ... Zone.

Claims (1)

Claims: (1) A recording disk is divided in a radial direction into a plurality of zones, and the number of sectors in one physical track increases from an inner peripheral zone to an outer peripheral zone. In a management method of an information recording / reproducing apparatus of a recording method for performing recording, a group of a first predetermined number of sectors from a physical track of each zone is constituted as one logical block, and each logical block is exchanged. The exchange sectors are arranged so that the number of sectors becomes the second predetermined number, so that the exchange sectors are arranged so that the ratio between the total number of sectors and the total number of exchange sectors in each zone is constant. A method for managing an information recording / reproducing device. (2) The method for managing an information recording / reproducing apparatus according to (1), wherein the logical positions of the exchange sectors in each of the logical blocks are the same.