JPS5965911A - Disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce extremely a loss of information in case of a crack or damage of a disk, and to raise reliability by recording plural times the same information at a distance on the same track of a disk-like recording medium, in an optical disk, a magnetic disk, etc. CONSTITUTION:N sectors (16 in case of the figure) of one track is divided by plural times (m). For instance, in case of (m)=4, N/m=4, that is to say, four sectors become one sector group. When information which records the i-th information for the j-th time is denoted as nj(i), n1(1), n2(1) and n4(1) are recorded in a sector 1, a sector 5 and a sector 13, respectively. n1(2)-n1(2) are recorded in sectors 2, 6, 10 and 14. In the same way, nj(3) and nj(4) are recorded in a ''O'' number track. In case of (i)>N/m, when the quotient of (m)X(i)/N and the remainder are denoted as (q) and (p), respectively, nj(i) can execute access immediately since the track number is (q), the sector number is (p), and the same information is recorded in p+N/m, p+2N/m and p+3N/m.

Description

[Detailed description of the invention] Industrial applications do.

Conventional configurations and their problems In general, optical disks, magnetic disks, etc. are disc-shaped recording media, and random access allows access to a specific position by moving the recording/reproducing head in the rotational or radial direction. It is excellent as a recording medium. That is, if the trunk and track are divided into sectors on the circumference in the radial direction, the position where information is recorded can be expressed by the track and sector number. In order to access recorded information quickly, it is necessary to arrange the information in order and to make a one-to-one correspondence between the information and the address where the information is recorded.

Conventionally, as a method for increasing the reliability of recorded information in devices that record and reproduce information on and from disc-shaped recording media, the circumference of the circle is divided into several parts as shown in Figure 1. A method was used to record the same information multiple times. In Figure 1, the circumference is divided into four groups n(1) to n(4), and one group is divided into four groups nl(1) to n1(4).
This is an example of recording the same information in different times. In this case, even if the disk-shaped recording medium has arc-shaped scratches or defects in the material, even if it is recorded multiple times in succession, all of the information recorded multiple times may be destroyed. Furthermore, since the disc-shaped recording medium is of course rotating, it is likely to be scratched in an arcuate manner by abnormal contact with a recording/reproducing head or the like or by being touched by an external object.

OBJECTS OF THE INVENTION An object of the present invention is to reduce information destruction caused by defects and scratches on disk-shaped recording media such as optical disks and magnetic disks.

Structure of the Invention The present invention associates information with an address where the information is recorded,
In addition, when recording important information, the same information is recorded several times, and in order to separate the locations where the same information is recorded as far as possible, the fiN of the sector of 11 tracks is divided by the number of times m of recording. , information (1) to information (N/m) from the first sector of the first group of m divided sector groups.
Up to the first Gunyoshi same information (1) ~ Information (N/m)
This is to record.

DESCRIPTION OF EMBODIMENTS FIG. 2 is an explanatory diagram of a disc-shaped recording medium used in a recording/reproducing apparatus according to an embodiment of the present invention. N sectors (16 in the figure) of one trunk are divided a plurality of times m. For example m
= 4, N/m = 4, that is, 4 sectors constitute one sector group. If the i-th information is recorded the j-th time as nBi), then nl(1) is sector 1 of trunk 0, n2(1) is sector 6, n3(1) is sector n4(1) is sector 3 to be recorded. n(2)
~n 1(2) is recorded in sectors 2, 6, 10, and 14. Similarly, n)(3) and nj(4) are recorded in trunk number 0. i) When N/m, let the quotient of mXi/H be q and the remainder be p, then nj(i) has the track number q, the sector number p, and p+N/m.

The same information is recorded in P+2N/m and p+3N/m, and can be accessed immediately. Therefore, even if a circumferential scratch spans N/m-1 sector groups, information can be reproduced because one sector group remains. To verify the information recorded several times, you can choose the correct information by comparing each piece of information and adding verification check information.

According to this configuration, it is possible to uniquely find the address where specific information is recorded by simple means (calculation), and it is possible to protect the information from large scratches and defects on the disc-shaped recording medium. Especially for directory areas such as optical discs, which have a large capacity and need to be carried around manually.
Since the directory area occupies a small proportion of the total memory capacity, even if it is recorded multiple times, it is a negligible amount of the total memory capacity.

Effects of the Invention According to the present invention, since the same information is recorded on the same track of the disc-shaped recording medium several times at intervals, there is extremely little loss of information even if the disc is chipped or damaged around the disc. Reliability can be improved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a disc-shaped recording medium in a disc recording/reproducing apparatus according to an embodiment of the prior art, and FIG. 2 is an explanatory diagram of a disc-shaped recording medium in a disc recording/reproducing apparatus according to an embodiment of the present invention. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] The number N of sectors on the same track of a disc-shaped recording medium is divided into m groups rm:>2) and divided into N/m groups, and
/ A disc recording/reproducing device having means for sequentially recording the same information m times in m groups at intervals.