JP3030303B1 - Optical disk medium and optical disk device - Google Patents

Abstract

An optical disk medium and an optical disk device capable of easily specifying a zone or a block position to which a sector belongs from a recording / reproducing sector address. SOLUTION: In an optical disk medium, when the number of sectors constituting a block is s, the number of tracks in a zone is m, and the number of sectors included in each track in the zone is n, nm · j = j S (j is an integer), and the number of sectors s constituting the block is set to satisfy s = 2 ^X (X is a natural number).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk medium divided into a plurality of zones according to a position in a radial direction, and an optical disk apparatus for performing recording and reproduction using the medium.

[0002]

2. Description of the Related Art In recent years, various sector arrangement methods have been proposed for optical disks. One of them is the ZCLV method. FIG. 7 shows a ZCLV (Zone Constant).
FIG. 3 is a diagram showing a configuration of a format disk of a Linear Velocity (constant linear velocity in area) method. ZC
In the LV system, the optical disc is divided into a plurality of areas (hereinafter, referred to as zones) according to positions in a radial direction. Each zone has a unique number of sectors, and each zone includes a sector included in a track. The numbers are different. The optical disk shown in FIG. 7 is one example, and the number of sectors per track increases by one each time one zone moves from the inner zone to the outer zone. In the figure, zones continuous from the inner peripheral side are, for example, zone (k-1), zone k, and zone (k +
1), the number of sectors is 3, 4, and 5, respectively. The sector address area including the address information of each sector is arranged in each zone so as to be linearly arranged in the radial direction.

Here, the width of such a zone is determined, for example, so that the recording density at the innermost circumference of each zone is constant. FIG. 8 is a diagram showing a specification example of a conventional optical disk medium. Here, as shown in FIG.
Up to six zones. For data recording, the innermost zone starts from a radial distance of 24 mm from the center of the disk. The number of sectors per track at the innermost circumference of the zone is 20. In this case, the minimum sector length is 24.000 × 2
× π / 20 = 7.540 (mm). The innermost radius x (mm) of the next zone is x × 2 × π / 21 = 7.5.
25.2 (mm) is obtained from the equation of 40 (mm).
When the track pitch is 1 (μm), the number of tracks in the zone is (25.2-24.0) /0.001=
1200. The same applies to the zone on the outer peripheral side.

When the zone interval is obtained in this manner, the minimum sector length in the zone becomes constant, and the recording density can be efficiently increased by using the shortest recordable pit length to the last. On the other hand, as described above, in order to perform recording and reproduction with the number of sectors per track and the minimum sector length in each zone as a predetermined value, when the zone to be accessed is switched (when accessing across zones),
It is necessary to switch the rotation speed of the optical disk in a stepwise manner. For this reason, it is necessary to wait until the number of rotations of the disk after the zone switching becomes stable without performing recording or reproduction.

On the other hand, when recording and reproducing video information, audio information and the like on an optical disk, it is common to perform processing in units of blocks such as error correction and interleaving. Then, the normal block is formed over a plurality of sectors. Therefore, a block may be formed across zones, and when recording or reproducing such a block, it is necessary to access across zones. In other words, writing / writing to blocks across zones
When reading, the data is processed in units of blocks such as error correction and interleaving. To complete writing / reading of this block, reset the disk rotation speed at the time of zone switching. This causes a time delay.

Also, in the above-described apparatus for performing recording and reproduction using the conventional optical disk medium, since a block may cross a zone boundary, the zone or block position to which the sector belongs is determined from the sector address. Is provided, and a zone or a block position of a sector in which writing / reading is to be performed is obtained by referring to this table.

Further, the optical disk medium is provided with an area called a replacement area for a disk defect. This area is an area where a plurality of sectors are used in place of a defective sector when a defective sector is found. 90mm diameter, 230
As defined in the optical disc standard of Mbyte's STANDARD ECMA-201, the replacement area is often provided at both ends of the user data area and at the zone boundary.

[0008]

Since the conventional optical disk medium is configured as described above, when writing / reading a block across zones, it is necessary to complete writing / reading of this block. There is a problem that a time delay is caused by resetting the disk rotation speed when the zone is switched.

Further, the conventional optical disk medium and optical disk apparatus need to have a table for specifying the zone or block position to which the sector belongs from the sector address because the block may cross the zone boundary. There was a problem.

[0010] The present invention has been made to solve the above problems, and when writing / reading a block across zones, the writing / reading of this block is performed.
It is an object of the present invention to obtain an optical disk medium that does not cause a time delay due to resetting of the disk rotation speed when a zone is switched to complete reading.

It is another object of the present invention to provide an optical disk medium and an optical disk apparatus which can easily specify a zone or a block position to which a sector to be written / read from from a sector address of the sector.

[0012]

An optical disk medium according to claim 1, wherein the optical disk medium is divided into a plurality of zones according to a position in a radial direction, and each of the zones includes m (m is an integer) tracks. In the medium, each track in the zone is subdivided into n (n is an integer) sectors that are constant for each zone and increase as the zone is located closer to the outer periphery, and are added to an error correction code addition unit or an interleave. A block, which is a processing unit, is composed of s (s is a fixed integer in the optical disk medium) sectors, and in the zone, nm · j = j · s (j is an integer)
Is satisfied, and the number s of sectors constituting the block satisfies s = 2 ^X (X is a natural number).

According to a second aspect of the present invention, the optical disk device is an optical disk medium which is divided into a plurality of zones according to a position in a radial direction, and each of the zones includes m (m is an integer) tracks. Each track in the zone is subdivided into n (n is an integer) sectors that are constant for each zone and increase toward the outer peripheral zone, and are units for adding error correction codes or for processing interleaving. A block is composed of s (s is a fixed integer in the optical disk medium) sectors, and in the zone, n
· M = j · s (j is an integer) satisfies the further sector number s that constitute the block, s = 2 ^X number (X is a natural number) rotating the optical disc medium which satisfies that the optical disc In the apparatus, when the sector address of each sector on the optical disk medium is N bits, the upper NX bits of the sector address are used as the block address of the block to which the sector to be accessed belongs, and the lower bits of the sector address are used. X bits
A means for performing access processing as a relative address in a block of a sector to be accessed is provided.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. Embodiment 1 FIG. FIG. 1 is a plan view of an optical disk medium according to Embodiment 1 of the present invention. This optical disk medium 1
Has a substantially circular track positioned concentrically around the rotation center point 2 or a spiral (spiral) track centered on the rotation center point 2.

The optical disk medium 1 is divided into a plurality of zones, which are annular regions, according to the position in the radial direction, and each zone has m (m is an integer) tracks. In other words, the tracks of the optical disc medium 1 are arranged in groups of m (m is an integer) adjacent tracks, and these groups each form one zone. In FIG. 1, four of these zones are shown, and these zones are labeled 3,
4, 5 and 6 were given.

Further, each track is subdivided into n (n is an integer) sectors 7, each of which has an equal number of channel bits. In each zone, the number n of sectors per track (one turn) is fixed, and the number n of sectors is provided so as to increase as the zone is positioned closer to the outer periphery. Each sector has a so-called header portion 8, in which control information such as a sector address for controlling writing / reading of information is written. In each zone, the header portion of the sector is aligned (inlined) in the disk radial direction. Further, each sector has a data portion on which user information is written or from which the user information can be read.

FIG. 2 is a diagram showing a configuration of a zone of the optical disk medium according to the first embodiment of the present invention. A block is a collection of s sectors (s is a fixed integer in the optical disk medium). Then, at least data recorded in the data portion is subjected to various types of information processing in units of this block. For example, RS (Reed Solo)
mon) adding an error correction code such as an inner code or an RS outer code, or performing an interleave process. Furthermore,
In some cases, a part of the data in the header portion also constitutes one pack data in block units.

The blocks are configured such that the total number of sectors in each zone is an integral multiple of the number of sectors included in one block. In other words, each zone satisfies the condition of nmm = js (j is an integer). Here, m indicates the number of tracks in the zone, and n indicates the number of sectors per track. Also, s indicates the number of sectors included in one block, and is constant in the optical disk medium. As a result, each zone has an integer number of blocks, and one block does not cross two zones between zones.

FIG. 3 is a diagram showing an example of specifications of an optical disk medium according to the first embodiment of the present invention. In this example, the data recording area is divided into six zones. The number s of sectors included in one block is 32, the number m of tracks in a zone is 1184, and the number n of sectors per track is 20 to 2 in the order from the inner zone to the outer zone.
5

As described above, by defining the number s of sectors included in one block, the number m of tracks in a zone, and the number n of sectors per track, there are no blocks crossing over zones, and one block is included. On the other hand, when writing / reading, there is no need to switch the disk rotation speed (if the zone changes, it is necessary to switch the disk rotation speed), and so on. There is no time delay associated with the resetting of.

Further, by setting the number of sectors s constituting the block to 2 ^s1 , the upper bits excluding the lower s1 bits of the sector address correspond to the block address, and the lower s1 bits correspond to the relative address in the block. Block management becomes easier.

Embodiment 2 FIG. An optical disk device that performs processing such as recording and reproduction using the optical disk medium described in the first embodiment will be described below as a second embodiment.
FIG. 5 is a block diagram showing a configuration of an optical disk device according to Embodiment 2 of the present invention. In the figure, 1 is an optical disk, 9 is a disk motor for rotating and driving the disk, 10 is an information recording / reproducing head capable of recording and reproducing data on the optical disk and moving to each zone of the disk, and 11 is an address conversion processing unit. Motor rotation speed control means 12 for controlling the rotation speed suitable for the zone being recorded / reproduced based on the motor rotation speed information. A zone and a block to which the sector belongs are specified by an external recording / reproducing address. An address conversion processing unit 13 for outputting track information corresponding to the position of the head to the information recording / reproducing head 10 and motor speed information to the motor speed control means 11, respectively. A recording gate signal (not shown) at the time of recording. ) To output the recording data to the information recording / reproducing head 10, and at the time of reproduction, to a reproduction gate signal (not shown). Ri from the information recording reproducing head 10 is a recording and reproducing means for reading a reproduced signal.

FIG. 4 is a diagram showing an example of a relationship among a sector address, a block address, and a zone address in an optical disk medium used in the optical disk device according to the second embodiment of the present invention. In the optical disk medium used here, for example, one block is formed by four sectors, and the zone of zone address 0 is composed of four blocks, and the zone of zone address 1 is composed of five blocks.

Next, a method of determining a block address and a zone address from a sector address in the address conversion processing section 12 will be described. First, the block address is obtained by dividing the sector address of the sector for recording and reproduction by the number of sectors constituting the block. For example, if the sector address is 22, 22/4 = 5 remainder 2 and the block address is the integer quotient (the integer part of the quotient) 5
Is obtained as The remainder indicates the relative position in the block to which the sector belongs. In the case of the previous example, the remainder is 2, and the third relative position in the block (beginning from the 0th position is 2 + 1th) is obtained. This means that when an attempt is made to actually access the 22nd sector (sector having a sector address of 22), the recording / reproducing means 13
In order to process the error correction code added / generated in block units in an error correction circuit (not shown) provided in the subsequent stage, it is necessary to access a block including the sector, that is, sector addresses 20 to 23. There is.
In processing such as error correction, it is necessary to obtain a block address including the sector from the sector address to be accessed. As described above, the block address including the sector from the sector address can be obtained immediately and easily. You can ask.

Further, the zone address is obtained from the block address. In this example, the block is configured to always increase by 1 each time the zone address increases by 1.
Assuming that each address starts from “0”, if the block address is k, k> = (n × n + 9 × n + 6)
The maximum n satisfying / 2 is the zone address. As described above, the block address and the zone address can be easily derived from the sector address by calculation without providing a separate table or the like.

Embodiment 3 FIG. An optical disk medium according to the third embodiment will be described. FIG. 6 is a diagram showing a configuration of a zone of the optical disc medium according to the third embodiment of the present invention. Then, at least data recorded in the data portion is subjected to various types of information processing in units of this block. For example, RS (Reed Solomon) inner code,
For example, an error correction code such as an RS outer code is added, and an interleave process is performed. Also, a part of the data of the header part may constitute one pack data in block units.

At the end of an area consisting of sp sectors where p blocks (p is an integer) are collected, an alternate area consisting of ks sectors (k is an integer) is added, The configuration is such that p + k = 2 ^q (q is an integer). In FIG. 6, for example, p
= 7, k = 1, and q = 3. By arranging the replacement area in this manner, the replacement area portion which has been collectively arranged at the front and rear portions of the conventional block is uniformly arranged in the data area, and the replacement process is performed during data recording. Even in the case of occurrence, the movement of the information recording head can be reduced, and the replacement area can be immediately accessed to perform the replacement processing. Also, the arrangement is 2 ^q
Are arranged as a unit, for example, if the block address starts from 0, the block in which all the lower q bits of the block address are “1” is the replacement area, so that the address management of the replacement area is easy. become.

Such replacement processing occurs when correction cannot be performed even by error correction processing. When the error correction code is added in units of blocks, not in units of sectors, and when error correction processing is impossible, replacement processing is also performed in units of blocks. Therefore, by setting the replacement area to a size s · k that is an integral multiple of the block, no waste occurs in the address space.

[0029]

Since the present invention is configured as described above, it has the following effects.

In the optical disk medium according to the present invention,
When there is no block that is an additional unit of an error code or a processing unit of interleaving across zones, and writing / reading is performed on a block at a zone boundary,
It is possible to eliminate the time delay associated with resetting the disk rotation speed when the zone is switched to complete the writing / reading of the block. Further, the zone and block position to which the sector belongs can be easily specified from the sector address of the sector to be written / read without preparing a separate table or the like. Further, by setting the number of sectors s constituting the block to s = 2 ^X , the upper bits excluding the lower X bits of the sector address correspond to the block address, and the lower X bits correspond to the relative address in the block. Block management can be facilitated.

The optical disk device according to the present invention drives the optical disk medium in which a block, which is a unit for adding an error code or a unit for processing interleaving, does not straddle between zones. If this block writes /
It is possible to eliminate the time delay associated with resetting the disk rotation speed when the zone is switched to complete the reading. Further, the zone and block position to which the sector belongs can be easily specified from the sector address of the sector to be written / read without preparing a separate table or the like. Further, when the number of sectors s constituting the block is s = 2
^X , and the sector address of each sector on the optical disk medium is N bits.
The X bits (ie, the upper bits excluding the lower X bits of the sector address) are used for the block address and the lower X bits.
The bits can be made to correspond to the relative addresses in the block, respectively, and the management of the block can be facilitated.

[Brief description of the drawings]

FIG. 1 is a plan view of an optical disc medium according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a zone of the optical disc medium according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a specification example of an optical disk medium according to the first embodiment of the present invention;

FIG. 4 is a diagram showing an example of a relationship among addresses of a sector, a block, and a zone of an optical disk medium used in an optical disk device according to a second embodiment of the present invention;

FIG. 5 is a block diagram showing a configuration of an optical disk device according to a second embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of a zone of an optical disc medium according to a third embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of a ZCLV format disk.

FIG. 8 is a diagram showing a specification example of a conventional optical disk medium.

[Explanation of symbols]

Reference Signs List 1 optical disk medium, 2 rotation center point, 3 to 6 zone, 7 sector, 8 header section, 9 disk motor, 10 information recording / reproducing head, 11 motor rotation speed control means, 12 address conversion processing section, 13
Recording and playback means.

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Yoshinobu Ishida 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Corporation (56) References JP-A-8-329612 (JP, A) 6-223503 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 20/12

Claims (2)

(57) [Claims] 1. An optical disc medium which is divided into a plurality of zones according to a position in a radial direction and each of the zones includes m (m is an integer) tracks. (N is an integer), and the number of blocks is an additional unit of an error correction code or a unit of processing of interleaving (where s is the optical disk medium). In the above zone, satisfies nm · j = j · s (j is an integer), and the number s of sectors constituting the block is s =
An optical disc medium satisfying 2 ^X (X is a natural number). 2. An optical disk medium which is divided into a plurality of zones according to a position in a radial direction, wherein each zone includes m (m is an integer) tracks. Each block is subdivided into n (n is an integer) sectors that are constant and increase in the zone located on the outer peripheral side, and s blocks (where s is the above-mentioned unit) for adding an error correction code or for processing interleaving are used. In the above zone, satisfies nm · j = j · s (j is an integer), and the number of sectors s constituting the block is s = 2
^In an optical disk drive for rotating an optical disk medium satisfying ^X (X is a natural number), the sector address of each sector on the optical disk medium is set to N.
, The upper NX bits of the sector address are used as the block address of the block to which the sector to be accessed belongs, and the lower X bits of the sector address are used as the relative address in the block of the sector to be accessed. An optical disk device comprising: means for performing access processing as a program.