JPH06282380A - Disk storage device - Google Patents

Abstract

PURPOSE:To provide the disk storage device which prevents local deterioration of a disk recording medium and shortens the total access time. CONSTITUTION:Sector data having a high frequency in read/write, for example, file management information on a magnetic disk D is preliminarily designated, and it is read out from the magnetic disk D simultaneously with the start of the device and is stored as cache data in a memory 4. When a file processing request is issued, read/write of file management information from/to the memory 4 is executed, and read from or write to the magnetic disk is executed based on this file management information. When a main power source is turned off, file management information stored in the memory 4 is transferred to the magnetic disk D by power supply from an internal power source part 5 to update the file management information on the magnetic disk D.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk storage device such as a magnetic disk device.

[0002]

2. Description of the Related Art Normally, a magnetic disk used as a database is roughly divided into a file data section and a file management information section depending on the file system supported by the OS (operating system) used. The file management information section includes a sector address on the disk used by the file, an update date, and the like, and is a section that is always read / written each time a file processing request is issued. Therefore, the file management information section has a higher read / write frequency than the data section, and the disk portion used in the file management information section is destined to deteriorate faster than other portions. .

[0003]

As described above, in the conventional disk storage device, since the read / write frequency of the file management information section is considerably higher than that of the data section, deterioration of the disk itself is not used in the file management information section. It tends to concentrate on the parts that are damaged, and there is a risk that disk destruction will occur unexpectedly early.

The present invention has been made on the basis of such a situation. Information such as file management information on a disk recording medium having a high read / write frequency is provided in a storage means such as a semiconductor memory which is independent of the disk recording medium. By reading / writing the storage means in response to a file processing request from the host, local deterioration of the disk recording medium can be prevented, and total access time can be shortened. It is intended to be provided.

[0005]

In order to achieve the above-mentioned object, a disk storage device of the present invention is a disk storage device for writing / reading information to / from a disk recording medium. Storage means for storing information, area information storage means for storing information for designating an area on the disk recording medium in which information to be stored in the storage means is stored, and area stored in the area information storage means An information transfer means for reading information from a designated area on a disc recording medium based on the designated information and storing it in a storage means, and a disc for which a request for writing / reading information to / from the disc recording medium is generated and which should be written / read. When the information of the area on the recording medium is stored in the storage means, writing / reading of information to / from this storage means And writing / reading means for performing out, and a updating means for updating the information of the specified area on the disc recording medium with information stored in the storage means.

In order to achieve the above object, the disk storage device of the present invention writes / writes information to / from a disk recording medium in which file management information including at least file data and position information indicating a storage location of this file data is recorded. In a disc storage device for reading, a storage unit for storing file management information on the disc recording medium and information for designating an area on the disc recording medium in which the file management information to be stored in the storage unit is recorded. Area information storage means for storing, information transfer means for reading file management information from a designated area on the disk recording medium based on the area designation information stored in the area information storage means and storing it in the storage means, and disk recording medium When a request to write / read information to / from Write / read means for writing / reading the file management information and writing / reading file data to / from the disk recording medium based on the file management information, and the file management information stored in the storing means on the disk recording medium. And updating means for updating the file management information.

[0007]

In the disk storage device of the present invention, the information transfer means reads the information from the specified area on the disk recording medium on the basis of the area specification information stored in the area information storage means when the apparatus is started up, for example, and the storage means. To store. After this,
When a request for writing / reading information to / from the disc recording medium is generated, the writing / reading unit checks whether or not the information of the area on the disc recording medium to be written / read is stored in the storage unit, and if it is stored. Information is written / read to / from the storage means. Then, for example, when the main power to the device is turned off,
The updating means updates the information in the designated area on the disk recording medium with the information stored in the storage means. Therefore, according to the present invention, it is possible to prevent local deterioration of the disk recording medium by storing the information of the area on the disk recording medium, which is frequently written / read, in the storage means.
It is also possible to reduce the total access time. Further, in the disk storage device of the present invention, for example, when the device is started up, the information transfer means reads out the file management information from the specified area on the disk recording medium on the basis of the area specification information stored in the area information storage means. Store in the storage means. After that, when a request for writing / reading information to / from the disc recording medium is made, the writing / reading unit writes / reads file management information to / from the storage unit and, based on the file management information, file data to / from the disc recording medium. Write / read. After that, for example, when the main power supply to the device is turned off, the updating unit updates the file management information on the disk recording medium with the file management information stored in the storage unit.

Therefore, according to the present invention, write / write
By storing the file management information on the disk recording medium, which is frequently read, in the storage means, local deterioration of the disk recording medium can be prevented and the total access time can be shortened.

[0009]

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

FIG. 1 is a block diagram showing the configuration of a magnetic disk device according to an embodiment of the present invention. In the figure,
Reference numeral 1 denotes a disk read / write unit that executes data read / write on the magnetic disk D. An interface unit 2 controls various command inputs from the host computer and transfer of read / write data between the host computer and the magnetic disk device. A disk controller 3 executes overall control in the magnetic disk device according to an input command from the host computer. Reference numeral 4 is a memory for storing a sector data group on the magnetic disk D designated in advance as cache data. Reference numeral 5 denotes an internal power supply unit including a rechargeable battery or the like, which is used when the operation of rewriting the data of the magnetic disk D with the data stored in the memory 4 after the main power supply is turned off. Reference numeral 6 denotes a ROM, in which a program executed by the disk controller 3 and sector addresses such as file management information on the magnetic disk D to be stored in the memory 4 when the apparatus is started are fixedly stored. . Reference numeral 7 denotes a RAM, which can store a sector address or the like on the magnetic disk D designated by an operator in advance through a host computer.

The magnetic disk device of the present embodiment is characterized in that sector data having a high read / write frequency on the magnetic disk D is set in advance, and this is read from the magnetic disk D at the same time when the device is started up as cache data. Read / store these sector data stored in the memory 4.
When a write request is issued, the read / write is executed for the memory 4.

Examples of the data with high read / write frequency include file management information when the magnetic disk device is used as a database on a file system. This file management information is the magnetic disk D
In addition to the number of each file stored in the disk, the sector address on the magnetic disk D in which the file is stored is included, and when the file processing based on the host request is performed, the read / write is always performed. For example, MS
In the case of DOS, as shown in FIG. 2, a file management information section is composed of master boot, reservation, directory, FAT # 1, FAT # 2, etc., and a data section follows this file management information section. There is.

Next, in the magnetic disk device of the present embodiment, the operation when the file management information section is made into a memory will be described with reference to the flowchart of FIG.

When the main power is turned on to the device (step 3
01), in the startup process, the disk controller 3 activates the disk read / write unit 1, reads the data of the file management information unit from the magnetic disk D, and stores it in the memory 4 (step 302). The sector address of the file management information section on the magnetic disk D is fixedly stored in advance in the ROM 6, and the disk controller 3 reads the file management information from the magnetic disk D based on this sector address.

Thereafter, each time a file processing request such as file creation, read / write request, file deletion, etc. is issued from the host computer (step 303), the disk controller 3 performs all memory 4 for reading / writing file management information. This is executed for the target, and the read / write of the file data is executed for the magnetic disk D based on the sector address and the like obtained from the file management information (step 304).

Thereafter, when the main power supply is turned off (step 305), power supply from the internal power supply unit 5 to the internal circuit is started. From this state, the disk controller 3
The file management information stored in the memory 4 is read and transferred to the magnetic disk D, and the content of the file management information section on the magnetic disk D is updated (step 306). After the update is completed, the power supply from the internal power supply unit 5 to the internal circuit is stopped.

Thus, according to the magnetic disk apparatus of this embodiment, file management information having a high read / write frequency is transferred from the magnetic disk D to the memory 4 at the same time when the apparatus is started up, and file management is performed in response to a file processing request from the host computer. By reading / writing information from / to this memory 4, local deterioration of the magnetic disk D can be prevented and the life of the magnetic disk D can be extended. Further, by reading / writing the file management information to / from the memory 4, the seek operation amount of the magnetic head for one file processing request can be reduced, and the access time can be shortened.

Next, another embodiment of the present invention will be described with reference to FIGS. 4 and 5. The configuration of the present embodiment is the same as that of FIG.
It is assumed that the OM does not store the sector address on the magnetic disk to be stored in the memory when the device is started up.

FIG. 4 is a state in which the sector data on the magnetic disk in the present embodiment is made into a memory, and FIG. 5 is a flow chart showing the operation procedure of the present embodiment. The operation of this embodiment will be described below.

After turning on the main power to the apparatus (step 50)
1) On the host computer, the operator designates a sector on the magnetic disk to be made into a memory by using a dedicated command and sets it in the RAM (step 502).
After the sector designation is completed, the disk controller reads the data of the designated sector from the magnetic disk and transfers it to the memory for storage (step 503). After that, every time a file processing request such as file creation, read / write request, file deletion, etc. is issued from the host computer (step 504), it is judged whether or not the target sector data exists in the memory (step 505). , If so, read / write to the memory (step 50
6) If not present, read / write is executed for the magnetic disk (step 507). After that, when the main power supply is turned off as in the above-described embodiment (step 50
8) The power supply from the internal power supply unit to the internal circuit is started, the disk controller reads the sector data stored in the memory, transfers the sector data to the magnetic disk, and updates the data on the magnetic disk with the data in the memory (step). 5
09). After the update is completed, the power supply from the internal power supply unit to the internal circuit is stopped.

Therefore, according to the present embodiment, the lead /
By freely specifying sector data with a high write frequency and storing it in the memory, it is possible to store in the memory, for example, file management information in which the storage area on the magnetic disk differs for each file system. Similar to the above-mentioned embodiment, it is possible to prevent local deterioration of the magnetic disk and shorten the total file access time. In this embodiment, the sector data stored in the memory is not limited to the file management information but may be file data.

Further, although the magnetic disk device has been described in the present embodiment, the present invention can be applied to an optical disk device capable of recording and reproducing data.

[0023]

As described above, according to the disk storage device of the present invention, information on a disk recording medium having a high read / write frequency such as file management information is stored in a storage means such as a semiconductor memory which is independent of the disk recording medium. In addition, by reading / writing the storage means in response to a file processing request from the host, local deterioration of the disk recording medium can be prevented and total access time can be shortened.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a magnetic disk device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a file management information part and a file data part on a disk in the magnetic disk device of FIG.

FIG. 3 is a flowchart showing an operation procedure represented by the magnetic disk device of FIG.

FIG. 4 is a diagram showing a manner in which sector data on a magnetic disk is converted into a memory in a magnetic disk device according to another embodiment of the present invention.

5 is a flowchart showing an operation procedure represented by the magnetic disk device of FIG.

[Explanation of symbols]

D ... Magnetic disk, 1 ... Disk read / write section, 2
... interface section, 3 ... disk controller, 4 ...
Memory, 5 ... Internal power supply unit, 6 ... ROM, 7 ... RAM.

Claims (3)

[Claims] 1. A disk storage device for writing / reading information to / from a disk recording medium, comprising: storage means for storing at least a part of information on the disk recording medium; and information to be stored in the storage means. Area information storage means for storing information for specifying the recorded area on the disk recording medium, and information from the specified area on the disk recording medium based on the area specifying information stored in the area information storage means. An information transfer means for reading and storing the information in the storage means, and a request for writing / reading information to / from the disk recording medium, and information in an area on the disk recording medium to be written / read in the storage means. If stored, a writing / reading means for writing / reading information to / from this storage means. When a disk storage apparatus characterized by comprising an updating means in information stored in said storage means updates the information of the designated area on the disc recording medium. 2. A disk storage device for writing / reading information to / from a disk recording medium recording at least file data and file management information including position information indicating a storage destination of the file data, wherein: Storage means for storing file management information; area information storage means for storing information for specifying an area on the disk recording medium in which the file management information to be stored in the storage means is stored; Information transfer means for reading file management information from a designated area on the disk recording medium based on the area designation information stored in the storing means and storing it in the storage means; and a request for writing / reading information to / from the disk recording medium. When a file occurs, write the file management information to the storage means. Performs only / read, write / read is performed in said file data to said disk recording medium on the basis of the file management information write /
A disk storage device comprising: a reading unit; and an updating unit that updates the file management information on the disk recording medium with the file management information stored in the storage unit. 3. The disk storage device according to claim 1, further comprising means for arbitrarily setting area designation information stored in the area information storage means.