JPS62245586A - Disk file management device - Google Patents

Abstract

PURPOSE:To surely discriminate whether a memory medium is a specified substance or not in a short time by storing identifying information for specifying the disk memory medium after the sector of respective cylinders. CONSTITUTION:The disk memory medium DM is divided radially into the cylinders 14a-14n and further divided into the sectors 11a-11n circumferentially. The front and the rear surfaces of the medium DM and the respective surfaces when the plural media DM are superimposed are managed as the head number. Further, after the sectors 11a-11m of the respective cylinders, a memory part 12 for storing the identifying information specifying the medium DM is provided. When the medium DM is mounted on a memory device 41, an optional file is written and read. A processor 42 receives an operating input from a keyboard 43 based on a processing program and displays the control of the memory device 41 and the guidance to a display device 44 or the like according to an interpretation result thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk file management device for managing files stored on a disk storage medium, and is particularly applicable to a relatively small floppy disk device similar to a so-called personal computer. This is suitable for file management.

[Conventional technology]

In a personal computer or the like that has a disk file device, for example a floppy disk device, if the disk storage medium is accidentally replaced between file open processing and file close processing 1, the disk storage The contents of files stored on the medium may be destroyed. During file open processing, the contents of the file management storage section of the disk storage medium attached to the disk file storage device are read and stored by the processing device. In subsequent file access processing, the file management information stored in this processing device is changed depending on the processing content.

Then, during file close processing, this changed file management information is written to the disk storage medium attached to the disk file storage device. Therefore, if the installed disk storage medium is exchanged between this file open processing and close processing 1, the file management information of the disk storage medium before the exchange or the file management information of the disk storage medium after the exchange will be written. As a result, the storage contents of the replaced disk storage medium will be destroyed.

Conventionally, there is a system in which the disk file storage device detects the attachment or removal of a disk storage medium from the disk file storage device, and sends a specific signal to a processing device accordingly.

As a reference for this type of technology, Japanese Patent Application Laid-open No. 51-
No. 77216, Utility Model No. 51-61807, Utility Model No. 51
There is No.-121018.

-F Also, each time a file access process is performed, it is now possible to check whether the attached disk storage medium is the specified one by checking whether a specific file is stored on the installed disk storage medium. Some did.

[Problems to be Solved by the Invention] A processing device receives a signal associated with attachment/detachment of a disk storage medium from a disk file storage device, thereby attaching a predetermined disk storage medium to the disk file storage device lt. If a message is sent from the processing device to prompt the user to do so, destruction can be prevented to some extent. However, data destruction cannot be reliably prevented because it is not possible to confirm that the disk storage medium that is inserted after prompting with a message is the original disk storage medium.

Additionally, checking for the presence or absence of a specific file takes too much time to check once, so it is generally only done in specific cases, such as immediately after the program prompts the operator to change the disk. .

Therefore, if a disk storage medium is replaced that cannot be detected by the program, there is a problem that destruction of the storage contents of the disk storage medium cannot be prevented.

SUMMARY OF THE INVENTION An object of the present invention is to provide a data file management device that can reliably determine whether a disk storage medium attached to a disk file storage device is the intended disk storage medium in a shorter period of time.

[Means for solving false problems]

To achieve the above object, the present invention provides at least one track 74 of the tracks constituting each cylinder of all cylinders of a disk storage medium.

The same identification information that specifies the disk storage medium is stored in the disk storage medium. The apparatus further includes a file open processing means for reading out the identification information stored in the disk storage medium and storing the identification information when opening an arbitrary file. Furthermore, when accessing an arbitrary file, the identification information stored in an arbitrary track of the disk storage medium is read out, and a match between the identification information and the identification information stored by the file open processing means is determined; and file access processing means for executing file access processing based on a match.

[Effect]

With the above method, identification information for identifying the disc storage medium is stored, and this identification information is stored by the file open processing means during file open processing. Then, during file access processing, this stored identification information is compared with the disk file storage information during the access processing, and if they match, the file access processing is executed. Therefore, when accessing a disk storage medium attached to the disk file storage device KK, it is always determined whether or not the disk storage medium is the same as the one that was opened. It can be reliably determined whether or not. Furthermore, since the identification information is stored in at least one predetermined track of the tracks constituting each cylinder of all the cylinders of the disk storage medium, the reading of the identification information during file access processing is limited to any one of the following. It is also possible to use a cylinder, therefore, the movement of the read head of the disk file storage device can be minimized, and the above determination can be made in a shorter time.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of the storage area of the disk storage medium DM used in this embodiment. 14a, 14 on the disk
It is further divided into cylinders indicated by b, . . . , 14n, and further circumferentially divided into cylinders lla, llb, .

It is divided into sectors indicated by 11m. Historically, the back and cover of a disc storage medium, and each side when a plurality of disc storage media DM are stacked, are managed as head numbers. The cylinders 14a, 14b, . . . , 14n are disk storage media D
When M is one plate, it is composed of an arbitrary track on the front surface and a corresponding track on the back surface. Furthermore, in the case where a plurality of disk storage media DM are attached to one shaft, it is further composed of these tracks and the corresponding tracks on the back of other disk storage media DM.

That is, a cylinder is made up of a set of tracks on the same radius. Here, the feature of this embodiment is that a storage section 12 for storing identification information for specifying the disk storage medium is provided after the sectors Ila to l1m of each cylinder] 4a, 14b, -, and 14n. .

In FIGS. 2 and 3, each sector lla, 11b,...
. , l1m, and the details of the disk identification information storage section 12. Each sector Ila to l1m has a synchronization code area 20. Index address mark 21.
Sector identification information 22. Check code 23. gap 2
4. Synchronization code area 25, data address mark 26.
Data area 27° Check code 28. It consists of a storage section that stores the gap 29. Here, sector identification information 22
, a sector address consisting of a cylinder number, head number, sector number, etc. is recorded.

As shown in FIG. 3, each disk identification information storage section 12 has the same configuration as that shown in FIG. 2 when only the synchronization code 20 to the gap 24 are cut out. However, here, instead of the sector address, the sector identification information storage unit 22' contains:
Record disc identification information. Disk identification information 22'
is a range of values that cannot be taken as a sector address,
It is set for each disk storage medium DM.

FIG. 4 is a block diagram showing the overall configuration of a personal computer employing the present invention. 41 is a disk file storage device, which can be selected as a disk storage medium DM,
Write any file to this fully installed disk storage medium DM.

Perform reading. Reference numeral 42 denotes a processing device, which includes a storage section for storing processing programs, data, etc. for each building, reads out the stored program 111 times, and executes it to accomplish a given rectangular process. A keyboard 43 is used to input various data, commands, etc. to the processing device 42 . 44 is a display device, which displays input data from the keyboard 43, results of processing by the processing device 42, intermediate results, etc. on a display screen. That is, the processing device 4
2 operates the keyboard 4 based on the stored processing program.
It receives the operation input from 3, interprets it, and controls the disk file storage device 41 and displays the cadence and the like on the display device 44 accordingly.

Figure 5, Figure 6, Figure 7 1. FIG. 8 is a flowchart showing processing programs constituting various processing means related to official embedding of disk files, and the processing programs shown in these flowcharts are stored in the storage section of the processing device 42. The processing device 42 then reads and executes these processing programs as necessary to achieve predetermined functions.

FIG. 5 is a flowchart showing a processing program for executing formatting so that the disk storage medium DM can be managed by the apparatus of this embodiment. When the processing program is started, first, in step 51, disc identification information is determined.

When generating the disc identification information 22', it is conceivable to have the operator specify it from the keyboard 43, or to generate random numbers within the processing device 42. In any case, it is good as long as this identification information 22' can be distinguished from the sector identification information 22.

Then, in steps 52 to 57, formatting is performed on all tracks of all cylinders. That is, in step 52, the cylinder number counter SNO is cleared to zero, and in step 53, the head number counter HNO is cleared to zero. In step 54, each cylinder 14a.

When formatting each track of 14b, . . . , 14n, each sector of the track] 1a,
1 l b, −, ] ] Sector identification information of m +142
2 and disk identification information 22' is prepared. Then, in step 55, track formatting is performed. Subsequently, in step 56, the count value of the head number counter HNO is incremented by 1, and it is determined from the contents of the head number counter HNO whether all heads have been completed, and if not, the process returns to step 54. If the process is completed, the process moves to step 57. In step 57, the count value of the cylinder number counter SNO is incremented by 1, and it is determined from the contents of the cylinder number counter SNo whether all cylinders have been completed. If not, the process returns to step 53 and the process is completed. If so, the process moves to step 58.

As a result, the disk identification information 22' unique to the disk storage medium DM is written to all tracks of all cylinders.
It will be done. After formatting of all tracks is completed, in step 58, data for initializing a file management table such as a directory is written in a predetermined area of the disk storage medium DM. This process is executed only once at the beginning when a certain disk storage medium DM is used in this embodiment.

FIG. 6 is a process flowchart showing the file open processing means POPN, which is a process performed at the start of a file operation on the disk storage medium DM which has been formatted by the process shown in FIG. 1. In step 6], the file management table is read from the disk storage medium DM installed in the disk file storage device 41,
Investigate whether there is a file requested to be opened.

The presence or absence of this file is determined in step 62, and if the file does not exist, the process ends with an error in step 66.

If the file exists, in step 63, the file information including the sector position where the file is recorded, file size, etc. is sent to the t1iis in the processing device @42.
K Import into the set file operation table. and,
At step 64, the disk identification information 22' of the disk storage medium DM is read out and also stored in the file operation table.

This completes the execution of 6pOpN during file open processing.

FIG. 7 is a processing flowchart showing the file access processing means FAO (!), and shows the file access processing for the file opened by the processing of FIG.

When accessing a file, first, in step 7], the disk identification information 22' is read from the disk storage medium DM, and in step 72 it is checked whether it matches what is stored in the file operation table. If they do not match, the process moves to step 73, and in step 73 it is assumed that a disk storage medium DM other than the disk storage medium DM to which the file should be accessed is installed in the disk file storage device 41, and the correct disk storage A guidance prompting to set the medium DM in the disk file storage section &41 is displayed on the ice/water device 44. Then, in the subsequent step 74, an operation input from the keyboard 43 indicating completion of the setting is waited for, and when this is input, the process moves to step 71, and the process of reading out the disc identification information 22' is executed again. If the match of the disk identification information 22' is confirmed in step 72, the file data is read in step 75, and the data for the target sector is read and written from the sector position to be omitted, and - number of file accesses are performed. finish.

FIG. 8 is a flowchart showing R from the disk identification information reading means, and R from this means shows details of what is executed in steps 61 and 71 of FIGS. 6 and 7. First, in step 81, the detection start flag SHF is reset before starting detection. In step 82, the first sector identification information 22 found from the current position of the read/write head RWH, which is provided in the disk file storage device 41 and reads or writes the storage contents from the disk storage medium DM, is
Read out. Subsequently, in step 83, it is determined whether or not the content corresponds to a sector address. If not, the information is recognized as disc identification information 22', and reading of the disc identification information 22' is thereby completed. If the content of this information corresponds to a sector address, the process of reading out the sector identification information 22 in step 82 is repeated.

However, in consideration of the case where the disk identification information 22' is not found even if the disk storage medium DM rotates 1N, the sector identification information 22 found first is stored. That is, for this reason, it is determined in step 84 whether or not the detection start flag SHF is set, and if it is not set, it is set in step 85, and the currently found sector identification information 22 is first set. This is stored as the sector identification information 22 found at step 82.
Move to. If the detection start flag EIHF has already been set in step 84, the storage of the first found sector identification information 22 has already been completed, so the process moves to step 87. The read sector identification information 22 is transferred to step 86.
It is compared with the first found sector identification information 22 stored in . If they match, it is assumed that the disk identification information 22' was not found as a result of transferring the disk storage medium DM, and it is assumed that the disk identification information 22' is not found. The predetermined value is set as the disc identification information 22', and the process ends. According to this, the disk identification information 22' can normally be read out within the time it takes for the disk storage medium DM to rotate once without performing a seek operation of the read/write head RWH. In this process, when the disk identification information 22' is not detected in step 88, a fixed value is returned as the disk identification information 22' because the disk used in the file management device other than this embodiment is This is to make the storage medium DM readable and writable in this embodiment.

As is clear from the above explanation, according to this embodiment, even if the disk storage medium DM is replaced for some reason between the start of the file operation and the end 1, the disk storage medium DM is replaced. Since it can be recognized that the DM is not the disk storage medium DM that should access the file, destruction of the contents of the disk storage medium DM can be prevented. 1. The time required to recognize this is within the time required for one revolution of the disk storage medium DM for each file access operation, and can be kept relatively short. 1. The disk format of this embodiment can be used to read and write operations without any problems even with conventional disk formats, and conversely, the disk storage medium DM used in conventional file management devices can be Since read and write operations can be performed in the embodiment, it is good from the viewpoint of reusability of disk data. In addition, the recording area for the disc identification information 22' is kept as small as possible, and the area that was previously used as a gap is used, so the data capacity on the disc storage medium DM is reduced. 1 never happens.

In this embodiment, the force ζ that causes the disk identification information storage section 12 to be placed at the rearmost position of each track may be located at any position, and there may be a plurality of disk identification information storage sections per track. Furthermore, each sector may have an area for disk identification information.

In addition to this embodiment, it is possible to receive a specific signal when a disk storage medium is inserted or removed from the disk file storage device described above, and check the disk identification information only in that case. The time it takes to confirm the media can be greatly reduced.

〔Effect of the invention〕

According to the present invention, it is possible to obtain a data file management device that can reliably determine whether a disk storage medium attached to a disk file storage device is the intended one in a relatively short time.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the configuration of a storage section of a disk storage medium according to an embodiment of the present invention, FIG. 2 is a diagram showing the configuration of a storage section of each sector, and FIG. 3 is a plan view of a disk identification information storage section. 4 is a block diagram showing the overall structure of a personal computer adopting the present invention. FIG. 5 is a flowchart showing an embodiment of format processing means for formatting a disk storage medium. FIG. Flowchart showing one embodiment of file open processing means, No. 7
The figure is a flowchart showing one embodiment of the file access processing means, and FIG. 8 is a flowchart showing one embodiment of the disk identification information successive generation means. DM=disk storage medium, 12: disk identification information storage section, 14a, 14b, -, 14m nijirinda, 4]: disk file storage device, FOPN: file open processing means, FAOO: file access processing means, 19. Figure 1 Ikya/4ffi-11sign, 20° 2nd area Figure 3'' Figure 4 District 5 Figure 6 Figure 7 Figure 80

Claims (1)

[Claims] 1. A removable disk storage medium is provided, and at least one of the tracks constituting each cylinder of all cylinders of the disk storage medium has the same identification information identifying the disk storage medium. a disk file storage device that can store and read any file from or to the disk storage medium, and the identification stored in the disk storage medium when opening any file to the disk file storage device. a file open processing means for reading information and storing the identification information; and a file open processing means for reading out the identification information stored in an arbitrary track of the disk storage medium and storing the identification information when accessing an arbitrary file to the disk file storage device; A disk file management device comprising: file access processing means for determining a match between information and identification information stored by the file open processing means, and executing file access processing based on the match. 2. The file access processing means, when reading the identification information from the disk storage medium, reads the identification information stored in the track of the disk storage medium corresponding to the position of the read head of the disk file storage device at the relevant time. A disk file management device according to claim 1.