JP2002230952A - Method of recording data to hard disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the heat generation of a head driving system and to prolong the life of the head driving system by decreasing the number of moving times of a head in writing of files and reading out of the files. SOLUTION: The presence information of the files for recording operation and the presence information (5d) of at least >=1 piece of the front files recorded at the hard disk prior to the recording of the files for recording operation are put into the start index and the files for the recording operation are successively written along the tracks of the hard disk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for recording data such as surveillance image data which has a large data amount (compared to, for example, character data) and which is frequently continuously written or recorded on a hard disk. The present invention relates to a method for recording data on a hard disk.

[0002]

2. Description of the Related Art Conventionally, as a method of recording data on a hard disk (hereinafter also referred to as HD), a FAT (Fi
A method using a file management method called “le Allocation Table” is widely known. F
The AT is a type of file system, and is used to manage which files are stored where when files are stored on a hard disk or the like. A conventional method of recording a file or data on a hard disk using the FAT is as follows. One file is generated by adding the management information of the original data to the original data to be recorded on the hard disk as needed, and the management is performed on the outermost peripheral portion of the disk-shaped disc and several tracks corresponding to the outermost peripheral portion. Write information. On the other hand, the file body data records data in clusters along a track (data area) inside a track (management area) for recording the management information. In this recording method, the management information includes FA
T, directory, etc., must be included, and the FAT is included in the management information.
It is called an AT file management system.
The cluster is a minimum unit when handling files on a hard disk. The size of the cluster varies depending on the file system and the capacity of the hard disk. The directory is a portion on the hard disk in which file management information is described, and is a portion where detailed information such as a file size and a modification date is written. Conventionally, the file body data has been written along tracks in cluster units. After writing data one round along a certain track, the data is moved to an inner track adjacent to the track, and data is written in cluster units along the track. Thus, when the outer track is full of data, data is recorded on the next inner track.
This recording method is also used as a standard in HDs and the like provided in personal computers, so-called personal computers.

In the conventional FAT method or method, when a system (eg, a personal computer, CPU) reads a file to the HD, it is necessary to know which file is located where. The FAT is a table for recording addresses indicating where the files are located. This table is recorded in an area portion (that is, a management area) from the outermost track on the disk to a predetermined number of inner tracks. That is, a recording area (management area) for recording management information (FAT or directory) is secured inward by a predetermined number of tracks from the outermost track. When writing (reading) a file to the hard disk, first, management information (FAT, directory, etc.) is recorded in a track on the outer peripheral portion of the disk allocated for recording the management information, that is, in the management area (from the management area to the management area). Read information). Next, data (file data body) is recorded (read) on a predetermined track inside the management area in cluster units. Next time you record a file on the HD,
After recording the management information of the file to be recorded in the management area so as not to overwrite the management information of other files, start from the cluster next to the cluster where the previous file is recorded, and copy the data of the file itself. Are recorded in cluster units along the track. Similarly, when reading a file from the HD, the location of the file is checked by referring to the FAT information relating to the file from the management area, and then the data of the file itself is read from a predetermined track.

The HD records and reads data on and from a disk by using a write head and a read head (hereinafter, the write head and the read head are simply referred to as heads). When recording data along a track, the head is almost fixed and the disk is rotated. When moving from one track to the next inner track, the head is moved slightly in the radial direction of the disk. As the distance between tracks increases, servo control for moving the head larger must be performed. In the conventional recording method using the FAT, the management information is recorded on the outermost track of the disc and tracks near the outermost track. Therefore, the conventional data recording method firstly
After writing the management information in the management area on the outermost circumference (near the disk), the head is moved to a predetermined track inside the management area, and the data of the file body is written in cluster units.
In order to record the next file, the head is returned to the management area, the head is moved again to a predetermined track inside, and data is written in cluster units following the previous file. The problem with this recording method is that the head must be moved back and forth and back and forth between the management area and the area (data area) for recording the data of the file body. Every time data is written, the head is moved between the management area and the data area in the diameter direction of the disk, so that the head and its drive system generate heat and have a bad influence on their life. To read a file recorded by the conventional recording method, as in the case of writing (recording), a head is located in the management area to access the file, and the location information of the file is obtained. The target file is read by moving the head. After all, the head and the head drive system easily generate heat, and the life may be shortened.

[0005]

SUMMARY OF THE INVENTION A method of recording data on a hard disk according to the present invention has been made in view of the problems of the prior art, and has as its object to solve the following problems. When writing a file following a previous file and reading a file following a previous file, the number of movements and the number of times of driving of the head drive system such as the head of the HD and the drive motor of the head are determined by the conventional method. The heat generation of the head drive system is suppressed and the life of the head drive system and the HD itself is prolonged by making it less than the method using the FAT.

[0006]

A method for recording data on a hard disk according to the present invention has solved the above-mentioned problems. The method for recording data on the hard disk according to the first aspect is as follows. A step of generating a recording operation target file by adding index information including information for searching for a file to recording target data to be recorded on a hard disk; Inserting the location information of the file to be recorded and the location information of at least one or more front files recorded on the hard disk before recording the file to be recorded, in the index information. The recording operation target file is
A file recording step of writing data in the order of addresses along the tracks of the hard disk. As described above, including the three steps, the file recording step, from the address area immediately after the area where the file written immediately before the recording operation target file is recorded,
This is a step of writing the recording operation target file. Note that a track in the present invention is a track that considers a hard disk as one track. That is, a track that is regarded as being continued after a certain track is followed by a next one track inside the track.

According to a second aspect of the present invention, in the method for recording data on a hard disk according to the first aspect, the recording target data is data containing one or both of image information and audio information. is there.

According to a third aspect of the present invention, there is provided a method for recording data on a hard disk according to the first or second aspect,
In the recording method, the index information is a header added to the front of the recording target data.

According to a fourth aspect of the present invention, in the method for recording data on a hard disk according to the first, second or third aspect, the index information includes a serial number of the file and a recording time information of the data to be recorded. This is a recording method that includes one or both.

[0010]

FIG. 1 is a schematic diagram of a method for recording data on a hard disk according to the present invention. FIG. 2 is a conceptual diagram showing an embodiment of a file configuration of a method for recording data on a hard disk according to the present invention. 1 and 2
An embodiment of a method for recording data on a hard disk according to the present invention will be described with reference to FIG. To implement the present invention,
Continuously or at regular intervals, such as monitoring data,
It is necessary to regard the data to be recorded on the hard disk with index information added as one file, and record the file configured in this way along the tracks of the hard disk (HD). is there. The index information includes information necessary for writing the file to the HD, information necessary for reading the file from the HD, attribute information of the file (eg, information about what data is included, file characteristics, etc.). , Etc.) and information for searching for the file (eg, a file start flag). As described above, the file includes the index information (not shown in FIG. 1) that is the information including the file search information, and is named A, B, C, D, E, F, G, H, I, and J. FIG. 1 shows a state in which a file is recorded along one track on one disk 3, a so-called platter, of several disks provided in a hard disk (not shown). It is assumed that the tracks on the disk (platter) 3 are the first, second, third, and fourth tracks from the outermost side. An actual hard disk has more tracks, but in the present invention, regardless of the number of tracks, and regardless of the number of disks (platters) included in the HD, files are stored in the same manner as described below. Recording can be performed along the track.

First, a file A is recorded on the outermost first track 4a, and a file B and a file C are recorded on the first track 4a following the file A. Further, the file D is recorded on the first track 4a. However, it is assumed that the first track 4a is completely written to the recording capacity while the file D is being recorded. In such a case, the front part (D1) of the file D which is a part of the file D is recorded on the first track 4a, and the remaining part of the file D which has not been completely written on the first track 4a is recorded. Rear (D
2) is recorded on the second track 4b. After the file D, the file E is recorded along the second track 4b, and the front part (F1) of the file F is recorded only in a portion that can be written on the second track 4b. File F
Could not write all to the second track 4b, so the process moves to the third track 4c to record the remaining part (F2) of the file F, which is the remaining part. 3
On the fourth track 4c, the rear part of the file F2 (F
2) Record file G and file H. File H
Is recorded, since the recording capacity (recording area) of the third track 4c has just been used up, the file I and the file J are recorded on the fourth track 4d. The file J cannot be completely recorded on the fourth track 4d, or the file K which is the file next to the file J (not shown)
Is recorded on a hard disk (not shown) having the disk 3 on a disk (or platter, not shown) to be recorded next to the disk 3 on which the files A to J are recorded. Continue recording along.

The index information to be added to the data to be recorded, which is the data of the file body, can be added as a so-called header. Further, as shown in FIG. 2, the index information may be divided into a header and a footer and added to the file body data. FIG. 2 shows a state where the file D is recorded in a predetermined file configuration on the first track 4a and the second track 4b in FIG. The last address where the end index of file C exists is:
There is a file end flag 2c indicating that the file C has ended, and (start index of) the file D starts from the next address. The start of file D is a file start flag 1d indicating the start of file D
Is recorded. An end index, which is a footer, is added after the data of the file D itself, and a file end flag 2d is recorded at the last address. The next address where the file end flag 2d exists is the start index information of the file E and the start start flag 1e of the file E. As described above, in the present invention, if the file D is described as an example, the main data of the file D which is the data to be recorded is:
A step of generating a file structure to which a start index and an end index are added is performed. The step of generating a file from the recording target data may be performed at one time, or may be performed in several stages before the file is finally written to the HD.

In the present invention, apart from or together with the step of composing the file, a procedure is executed in which the start index of the file D always includes at least the following two pieces of information. One of the information is the location information of the file D. That is, for example, the file start flag 1d corresponds to this. The file start flag 1d contains start information (eg, an address) of the file D and file information (eg, a file identification code) for identifying the file D from other files. As described later, in addition to the file start flag, the file location information may include the serial number of the file or the recording time of the file or the data to be recorded.

The other information is the location information of at least one of the files recorded before the file D, in this case, the file A, the file B and the file C. For example, the address information of the file A is recorded as the location information 5d of the file A. As described later, the location information of the front file may include the serial number of the front file or the recording time of the front file or the data to be recorded ahead.
FIG. 3 shows the steps included in the recording method of the present invention in a flowchart. FIG. 3 is a flowchart showing steps of a method for recording data on a hard disk according to the present invention. Index generation S1, file generation S
2. Write address search S4, HD recording S4
Each step is included. Each of the steps S1, S2 and S3 must be executed at some stage,
It does not need to be in the order of FIG. The order of execution may be changed, as desired by those skilled in the art.

(Reading of Recorded Data) When a system (not shown) tries to read (play back) the file B from the HD, it knows that the location information 5d of the file A exists in the start index of the file D. Since the system knows that the file B is a file near the file A, the system can easily find the file start flag (not shown) of the file B (not shown in FIG. 2). . That is, when searching for a target file (referred to as file B), the system first searches for an appropriate file. Since a file always has index information, a certain file (here, file D)
You can reach the start index. The location information of the file recorded before the file is obtained from the location information on the front file (here, A) recorded in the start index, and the file can jump to the file (file A). Next, the target file (here, file B) can be found by grasping the distance relationship between the file (file A) in the recording space (here, the positional relationship between file A and file B).

In the present invention, the file D having such search information is written along the tracks (4a, 4b). The recording after file D is also performed on the track (4
(b), (4), (4), and (d), in order of addresses following the previous file. That is, the files A to J are sequentially recorded in the recording space of the hard disk, that is, without a space therebetween. The same applies when recording the file K and subsequent files from the next address of the file J. Start recording one file from the next address of the previously recorded file. By doing so, the HD write head is fixed, and the disk 3 is rotated, so that the HD
Continuous recording of files to Only when moving to the next track, such as when moving from the track 4a to the track 4b, the head needs to be slightly moved. Of course, at the time of reading, it is possible to read the file continuously with the reading head almost fixed. The file body data may be any type of data, for example, image data, image data and audio data, or data obtained by superimposing them.

According to a fourth aspect of the present invention, when the index information includes one or both of the serial number of the file and the recording time information of the data to be recorded, the file recorded on the HD according to the present invention is read out. It is convenient. Assuming that the system has reached a file, that is, reading the index of the file, refer to the serial number and look for the file ahead (near)
This is because it is possible to jump to the target (file) ahead by referring to the file or the recording time information of the data to be recorded. Of course, the user may jump to the search target file (nearby) by referring to both the serial number and the recording time information. For example, assume that there are 1000 files, and the system wants to search for a file (serial number 442) recorded on the index information with a serial number 500 and recorded at 15:20. It is assumed that the index information of the file with the serial number 500 includes the recording time information of the file with the serial number 500 of 16:20 and the recording time information of the file with the serial number 380 that is the front file is 14:20. Then, the serial number of the target 15:20 record file is 440
It is easy for the system to know that it may be the serial number before or after the number. Therefore, the file with the serial number 440 recorded at 15:20 can be read by jumping from the file with the serial number 500 to the serial number of the file 440 and searching for the index information of the previous and subsequent files.

[0018]

The method for recording data on a hard disk according to the present invention is as described above, and has the following effects. When writing files one after another to the hard disk, the head is moved little or no, and the disk is rotated to record along the tracks. This is because management information (search information) is added to the file data itself, and only one disk is moved along a track as one file, and the one file is recorded in accordance with the address order of the track. Therefore, even when reading files one after another from the hard disk, the files can be read along the tracks, that is, by moving only the disk. Therefore, according to the present invention, the number of radial movements and the number of drives of a head drive system disk such as a head and a head drive motor at the time of writing and reading a file can be determined by using a conventional FAT. It is possible to reduce the heat generation of the head drive system and extend the life of the head drive system and the HD itself.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a method for recording data on a hard disk according to the present invention.

FIG. 2 is a conceptual diagram showing an embodiment of a file configuration of a method for recording data on a hard disk according to the present invention.

FIG. 3 is a flowchart showing steps of a method for recording data on a hard disk according to the present invention.

[Explanation of symbols]

 1d, 1e File start flag 2c, 2d File end flag 3 Disk (platter) 4a, 4b, 4c, 4d Track 5d Location information of file A 5e Location information of file A and location information of file C S1 Index generation step S2 File generation Step S3 Search step of write address S4 Recording step to HD

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (Reference) H04N 5/781

Claims (4)

[Claims] 1. A step of adding index information including information for searching for a file to data to be recorded to be recorded on a hard disk to generate a file to be recorded, and adding the recording operation to the index information. Entering the location information of the target file, and the location information of at least one or more forward files recorded on the hard disk before recording the recording operation target file; andrecording the recording operation target file on a track of the hard disk. A file recording step of writing the file in the order of addresses along the line, and wherein the file recording step starts from the address immediately after the area in which the file written immediately before the file to be recorded is recorded. It is a step to write the target file Characteristic method of recording data on hard disk. 2. The data recording method according to claim 1, wherein the recording target data is data including one or both of image information and audio information. 3. The method for recording data on a hard disk according to claim 1, wherein the index information is a header added to the front of the recording target data. 4. The data on a hard disk according to claim 1, wherein the index information includes one or both of a serial number of the file and recording time information of the recording target data. Recording method.