JPS5965910A - Disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce extremely a loss of information in case of damage of a disk in the circumferential direction and the diameter direction, and to raise reliability by recording plural times the same information on different tracks of a disk- like recording medium and also at different positions in the circumferential direction, in an optical disk, a magnetic disk, etc. CONSTITUTION:Information n1(1) is recorded in a sector 1 of an (o) number track, and n2(1) of the second time is recorded in a sector 5 of an (l) number track (provided that l>=iXm/N). In this case, N is 16 as the number of sectors of one track, (m) is the number of times of recording of the same information, and (i) is a sector position (number). Thereafter, in the same way, n3(1) is recorded in a sector 9 of a track whose track number is further distant by (l). In case of i>N, when the quotient of i/N and the remainder are denoted as (q) and (p), respectively, n1(i) and n2(i) are recorded in a sector (p) of a (q) number track and a sector (p+N/m),... of an (l+q) number track, respectively. Accordingly, even in case when there is a flaw on the whole (q) number track in the circumferential direction, original information can be reloaded from information left on the tracks of q+2l, q+3l, q+4l....

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording/reproducing device whose component is a disc-shaped recording medium whose reliability is improved by recording the same information multiple times.

Conventional configurations and their problems In general, optical disks, magnetic disks, etc. are disk-shaped recording media, and they are random access disks that can access specific positions by moving the recording/reproducing head in the rotational direction and radial direction. Excellent as a recording medium. That is, if the track and trunk are divided into sectors on the circumference in the radial direction, the position where information is recorded can be expressed by the trunk and sector number. In order to speed up access to recorded information, 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.

In an apparatus for recording and reproducing information on this kind of disc-shaped recording medium, as a method of increasing the reliability of recorded information, the circumference of the circle is divided into several parts as shown in Figure 1, and each of the divided groups is A method was used to record the data multiple times. 1st
The figure shows an example in which the circumference is divided into four groups, n(1) to n(4), and one group is divided into four times, n1t11 to n+(4), and the same information is recorded. In this case, if the disc-shaped recording medium has an arc-shaped scratch or a defect in its material, even if it is recorded several times in succession, all of the information recorded multiple times may be destroyed. Furthermore, since the disk-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 the destruction of information due to defects and scratches in disc-shaped recording media such as optical disks and magnetic disks.

Structure of the Invention The present invention associates information with the address where the information is recorded, and when recording important information, the same information is recorded multiple times on different tracks on the same disk and in different sector positions between tracks. This is a disc recording and reproducing device that has the function of

DESCRIPTION OF THE EMBODIMENTS FIG. 2 is a diagram showing the configuration of a disc-shaped recording medium used in a disc recording/reproducing apparatus according to an embodiment of the present invention.

Information n+(1) is recorded in sector 1 of track 0, and
The second n2(1) is the 4th track (however, β≧ixm/N
) is recorded in sector 5. Here, N is the number of sectors in one track (16), m is the number of times the same information is recorded, and i is the sector position (number).

Similarly, n3(1) is recorded in sector 9 of a track further away by six tracks. Therefore, when 14N, information is recorded in n+(il) on track 0, and n
2 (jJ, n3(2), ... are sector 2N//n of track 1, respectively), sector 3 of track 2β
N7m... is recorded.

When i>N, let the quotient of i/N be q and the remainder be p, then
n+(i) is the 9th track Seftar, old (1) is β-
It is recorded in sectors (p+N/m), . . . of tracks 1-9. Therefore, even if there are scratches on the entire trunk q in the circumferential direction, (1+211, (1+31 + q+
The original information can be restored from the information left on the tracks 41... Also, the sector is p+”/”+p+ 2N/m
, . . . , the information is protected even for dog bites that straddle the radial track. Note that information recorded multiple times may be verified by selecting the correct information by comparing each piece of information or by adding verification check information.

In such a device, the address where specific information is recorded can be uniquely found by simple means (calculation), and the information can be protected from large scratches and defects on the disc-shaped recording medium. .

In particular, the total memory capacity (
Since the directory area occupies a small proportion of the total capacity (Company), even if multiple recordings are made, the amount is negligible compared to the total capacity, and has a significant effect on data reliability.

Effects of the Invention According to the present invention, the same information is recorded multiple times on different tracks of a disc-shaped recording medium and at different positions in the circumferential direction. It is possible to minimize defects in the number of defects, thereby improving reliability.

[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 2nd
Figure nri (f)

Claims (1)

[Claims] The number of sectors K on the track of the disc-shaped recording medium is 1//In
A disk recording and reproducing apparatus has means for recording the same sector position information m times shifted by lj in each track separated by a prescribed number of trunks.