JPH02118969A - Data recording system and disk recording medium - Google Patents

Abstract

PURPOSE:To decrease a data recording area not in use and to improve the utilizing efficiency by recording a directory data from a head scanning direction start of its recording area and recording an information data from the end of its recording area sequentially. CONSTITUTION:The directory data is recorded sequentially in a direction of the arrow X from a start sector of an address 0 and a picture data is recorded sequentially in a direction of arrow Y in a reverse direction from the end sector side of an address (r). Then a picture data L is recorded in an area of addresses S - (S'-1), and when the directory data is written in an address P and the size of the area of addresses (P+1) - (S-1) is smaller than the sum of data lengths of one picture data and one directory data, the recording of a picture data is inhibited in the data recording area. The area of the addresses (P+1) - (S-1) remains an area not in use, but since it is smaller than the area required for recording one picture data, the area not in use is reduced remarkably and the data recording area is used efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data recording method and a disc-shaped recording medium suitable for use in an image file system using a disc-shaped recording medium such as an optical disk or a magnetic disk.

[Conventional technology]

A large amount of image data is recorded on a disk-shaped recording medium (hereinafter simply referred to as a disk) used in an image file system, and necessary image data can be arbitrarily reproduced and displayed as an image. In order to be able to specify and reproduce arbitrary image data in this way, the data recording area on the disc contains, in addition to the image data, the start address data of the recording location of the image data and the data length for each image data. data.

Directory data consisting of file name data, date data, attribute data indicating whether deletion is possible or not, etc. is also recorded.

When the user specifies the file name of desired image data on such a disk, directory data including this file name is read from the disk, the start address and data length of the image data are detected from this directory data, and the start address and data length of the image data are detected and specified by the user. The searched image data is searched and played back.

On a disc, in order to search for image data, the directory data must first be read along with specifying the file name, so in order to easily read the directory data, each directory data is Printing is performed in order from the starting end of the print area in the head scanning direction. For example, on an optical disc, -a
Since the head scans from the inner circumferential side to the outer circumferential side, the directory data is sequentially recorded from the inner circumferential starting end of the data recording area.

A disk used for an image file system has an information data area for recording image data in the data recording area and a directory data area for recording directory data, and the size of each area is determined depending on the system. There is. Furthermore, from the above, the directory data area is provided on the starting end side of the data recording area in the head scanning direction. In the information data area,
Image data is sequentially recorded from the starting end side in the head scanning direction.

[Problem to be solved by the invention]

By the way, according to the conventional data recording method described above, since the sizes of the directory data area and the information data area are determined in advance, data is recorded to the extent that it is no longer possible to record in either of these areas. and,
Image data cannot be recorded.

In FIG. 5, the data recording area on the disk now consists of sectors from the sector at address 0 to the sector at address r, and the directory data area consists of sectors from address 0 to sector r.
It is assumed that the area of p-1 and the information data area are the area of address p-r. Here, it is assumed that one piece of directory data is written in one sector.

When recording image data on such a disc, first image data A is recorded at address pp' of the information data area, and then directory data a corresponding thereto is written at address 0 of the directory data area. Next image data B is recorded at addresses p'+1 to p'' following image data A, and directory data b corresponding thereto is recorded at address 1.

Image data is recorded in the information data area and directory data is written in the directory data area in the same way as in the case below, but when image data k is recorded at addresses q+1 to q' in the information data area, If directory data k for this is written to the final address (p-1) of the directory data area, image data can no longer be recorded, and the area from addresses (q'+1) to r is no longer used in the information data area. It will remain as it is.

Conversely, even though the information data area is filled with image data, an unused area may remain in the directory data area.

As described above, in the conventional data recording method, an area remains unused, resulting in a gap in which the usage efficiency of the disk decreases.

To prevent this, it is necessary to make the data lengths of the image data completely equal, and to increase the size of the information data area and the directory data area at a ratio equal to the data length ratio of the image data and directory data (for example, 10:1). However, as image data, the data length varies depending on the resolution and gradation depending on the number of dots, or whether it is a black and white image or a color image. When recording on the same disc, the above-mentioned problem occurs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a data recording method and a disk-shaped recording medium that solve these problems, reduce the unused area of the data recording area, and significantly improve the efficiency of its use.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides that in a data recording area of a disk, directory data is arranged from the starting end side of the data recording area in the head scanning direction, and information data is Recording is performed sequentially starting from the end of the recording area.

[Effect]

Directory data is recorded sequentially from the starting end of the data recording area, and information data is recorded sequentially from the terminal end, so - when data recording is no longer possible, the data recording area has the final directory data recording range. The area from the final end to the beginning of the final information data recording range is an unused area. However, the size of this unused area is smaller than the sum of the data length of one piece of information data and the data length of one piece of directory data.

On the other hand, in the conventional technology shown in FIG. 5, the unused area is generally larger than the sum of the above data lengths, and an area large enough to record one or more pieces of information data is used. It ends up being left unattended.

As described above, according to the present invention, the size of the unused area is significantly reduced, and usage efficiency is improved.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of a data recording system and a disk-shaped recording medium according to the present invention.

In the figure, if the head scanning direction of the data recording area of the disk is indicated by an arrow
．． ......, r is attached. Therefore, the sector at address O becomes the start end of the data recording area, and the sector at address r becomes the end. Here, in order to simplify the explanation, it is assumed that one directory data is written in one sector.

In this data recording area, directory data is recorded sequentially from the starting sector at address 0 in the direction of arrow X, and image data is recorded sequentially from the terminal sector at address r in the direction of arrow Y, which is the opposite direction to the direction of arrow X. be done.

That is, when recording the first image data A in an unrecorded data recording area, an area with a size equal to the data length of the image data A is set, with the last sector being the end sector at address r. The address of the first sector in this area is t"(" r + 1-Qa.

However, assuming that QA is the data length of image data A), image data A is recorded in the area of addresses t'' to r in the direction of arrow X from the sector with address #.

At the same time, directory data a for this image data A is written to the sector at address O.

When recording the next image data B, create an area with a size equal to the data length of image data B, with the last sector being the sector at the address (t"-1) immediately before the area to the image data area. Set.

The address of the first sector in this area is t'(=t"-Q
A, however, Q3 is the data length of image data B), then
Image data B is recorded in the area from address t' to (t#1) in the direction of arrow X from the sector at address t'. At the same time, directory data b for this image data B is written to the sector at address 1.

As described above, the image data and the directory data are recorded in order, and the image data L is recorded in the area of addresses S~(S'-1) Sc! When the directory data is written to the address P, the address (T”41)
If the size of the area ~(S-1) is smaller than the sum of the data lengths of 1 double image data and 1 directory data, then
Recording of image data is prohibited in this data recording area.

This area from addresses (P+1) to (S-1) remains as an unused area, but since it is smaller than the area required to record one image data, the conventional data recording method described above requires a large area to record one image data. Compared to the case where a larger area remains as an unused area, the unused area is significantly reduced, and the data recording area can be used efficiently.

Next, this embodiment will be described in more detail with reference to FIGS. 2 to 4, assuming that the disk is an optical disk.

FIG. 2 is a schematic diagram of an image file system using this embodiment, in which 1 is a host computer, 2 is a disk drive device, 3 is an optical disk, 4 is an image scanner, and 5 is a display device.

In the figure, a disk drive device 2 is connected to a host computer 1 through a 5C3I interface, and drives an optical disk according to instructions from the host computer 1.
Perform data recording and playback. The image scanner 4 inputs images that need to be recorded, and the input images are processed by the host computer 1 such as conversion into digital image data, and then supplied to the disk drive device 2 to be recorded on the optical disk 3. recorded in At this time,
Directory data for this image data is also recorded on the optical disc 3. When reproducing desired image data, the user inputs its file name. Thereby, the host computer 1 outputs a reproduction command to the disk drive device 2.

Therefore, directory data is read from the optical disc 3, and its file name is compared with the input file name. When the two match, the disk drive device 2 is commanded to reproduce data from the optical disk 3 based on the address data and data length data of the image data from the directory data. The image data thus reproduced is subjected to processing such as conversion into an analog image signal in the host computer 1, and the obtained image signal is supplied to the display device 5 for image display.

FIG. 3 is a diagram showing a track pattern of the optical disc 3 in FIG. 2.

In the figure, a spiral track 31 is formed on an optical disk 3, and is divided into sectors. In such an optical disc 3, a head (not shown)
The scanning direction is from the inner circumferential side to the outer circumferential side, and each sector is assigned an address that increases by one in the scanning direction. Here, the sector address consists of a track number that differs for each round of the track and a sector number that represents the order of sectors in one round of the track.Here, to simplify the explanation, the sector address is expressed in the head scanning direction. The address is incremented by 1. 5.
Taking a 25-inch optical disc as an example, 17 sectors are provided per round of the track 31, of which 16 sectors are used for recording data and the remaining 1 sector is used for error processing.

Furthermore, one sector has a capacity of 512 bytes.

Hereinafter, such an optical disc will be explained as an example.

The data recording area of the optical disc 3 is expressed in hexadecimal numbers (OOO
O), 6 to (FFFFF)+6 addresses are attached. Address (0000) is the sector at the inner edge (starting sector) of this data recording area, and address (FFFFF)+6 is the sector at the outer edge (terminating sector).

Here, as shown in FIG. 4, 512 dots (pixels)
Taking as an example the image data of a black and white multivalued image with a resolution of 512 dots and 256 gradations with 8 bits per dot, the data length of this image data is 512 bits x 5.
12 bits x 8 pints - 262144 bytes and 5
It is 12 sectors, and one directory data is 32
Assuming that the optical disk 3 is unused and the above image data is recorded on the byte, which is one sector, 512- (,020
OL&, the last sector of the area where this image data is recorded is the end sector of the address (FFFF F), and the first sector is (FFFF) + 6 + (OO
OIL6- (0200)+6=(FEO0)16. In other words, this image data is an address (F E
Address (
Data is recorded up to the end sector of F F F F)+6. At the same time, directory data for this image data is written to the starting sector at address (OOOO)+6. Such recording operation is performed under instructions from the host computer 1 (FIG. 2).

Next, when recording other image data with the same data length, the final sector for this image data is (FEO0)16 (OO01)+6 = (FD
The data length is 512 as the sector at address FF)+6
An area corresponding to a sector is set. The first sector of this area is (FEOO), (0200)16- (F COO
)l& address sector. Therefore, this image data is recorded from the sector at address (F C00)+6 to the sector at address (F D F F)+6 in the outer circumferential direction. Along with this, the directory data for this image data is the address (Oo o 2)
+, is recorded in the sector.

Note that the address (FEOO)+i shown in FIG. 3 is not an exact position relative to the address (FFFFF)+6, but is merely positioned for convenience.

In this specific example, assuming that the data lengths of the recorded image data are all equal, the number of sectors in the data recording area is 1.
6', the result is 16' 1513-2043 (remainder 511), and 511 sectors are unused.

Also, in this specific example, one directory data is written in one sector, but if multiple image data are to be recorded continuously, the directory data for these image data should be written together in the same sector. Good too. In the above example, the directory data is 32
One sector is 512 bytes, so 512/
32=16 directory data can be written in one sector.

Note that the numerical values in the above embodiments are merely examples, and the present invention is not limited thereto.

Further, the disk may be a magnetic disk, a magneto-optical disk, or the like, and the information data may be other than image data.

〔Effect of the invention〕

As described above, according to the present invention, the unused area in the data recording area on the disk is significantly reduced, and its utilization efficiency is significantly improved.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the data recording method and disk-shaped recording medium according to the present invention, FIG. 2 is a schematic configuration diagram of an image file system using the data recording method according to the present invention, and FIG. FIG. 4 is a diagram showing an example of the structure of image data, and FIG. 5 is a diagram showing an example of a conventional data recording method. 1 tone τ sphere = H to Fig. 3 (FEOO), 6

Claims (2)

[Claims] (1) In a method of recording a large number of information data and directory data for each piece of information data on a disk-shaped recording medium, each directory data is sequentially recorded from the starting end in the head scanning direction of the data recording area on the disk-shaped recording medium. A data recording method characterized in that each information data is recorded sequentially from the terminal side. (2) In a disk-shaped recording medium on which information data and directory data are recorded, the directory data is packed from the starting end side of the data recording area in the head scanning direction, and the information data is packed from the same end side of the data recording area. A disc-shaped recording medium characterized by being recorded with.