JPH10124400A - Data processor and method for accessing data recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to access recorded data even when a recording medium is removed during the period of updating by recording management data by successively using plural management areas. SOLUTION: A central processing unit(CPU) 2 reads out management data from a recording information managing area. Then the CPU 2 checks a free area in an IC memory card 5 based on the read management data and records picture data in the free area. Then the CPU 2 adds the management data for the recorded picture data to management data read out from a valid management area and records the data in an invalid management area. Finally the CPU 2 sets up the leading address of the invalid management area to a significant value and then sets up the invalid management area in the valid management area. A management area set up in the valid management area is updated by a prescribed value and data in the management area are erased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing apparatus and a data recording medium access method, and can be applied to, for example, a computer accessing an IC memory card. The present invention records management data by sequentially using a plurality of management areas, so that even if a recording medium is removed during updating, data that has been recorded so far can be accessed. I do.

[0002]

2. Description of the Related Art Conventionally, in a recording medium such as an IC card, by recording management data in a part of a recording area, various data can be accessed based on the management data. .

FIG. 5 is a schematic diagram showing a recording area of this type of recording medium. For example, a predetermined range from a head address is allocated to a recording information management area, and the rest is allocated to a user area. When a user instructs this type of recording medium, for example, a user instructs writing, the computer accesses the recording information management area and detects a free area in the user area from the recorded management data.

Further, when the computer accesses the empty area and writes the desired data, the computer records the address of the written data together with the file name in the recording information management area. At this time, the computer responds to the management data recorded in the recording information management area until then.
The management data is newly added, and all or part of the recording information management area is updated. As a result, even if this type of recording medium is loaded into another computer,
It can be freely accessed based on the management data recorded in the recording information management area.

[0005]

However, such a recording medium is detachable, so that it may be erroneously removed from the computer while the recording information management area is being updated. In this case, in the conventional recording medium, the management data previously recorded in the recording information management area is newly added with management data, and all or a part of the recording information management area is updated. Therefore, there is a problem that it becomes difficult to access the file even though the file remains in the user area.

Even in such a case, if at least the data recorded up to that time can be accessed, the usability of this type of recording medium can be improved.

The present invention has been made in view of the above points, and even if a recording medium is removed during updating, a data processing apparatus and a data processing apparatus capable of accessing data recorded up to that time. It is intended to propose a method of accessing a recording medium.

[0008]

According to the present invention, there is provided a data processing apparatus and a method for accessing a data recording medium, the method comprising: setting a valid management area and an invalid management area on a recording medium; After the recording, the management data is recorded in the invalid management area, and then the invalid management area and the valid management area are set as the valid management area and the invalid management area, respectively.

In addition, the data recorded on the recording medium is accessed according to the management data recorded in the effective management area.

After recording the management data in the invalid management area, if the invalid management area and the valid management area are set as the valid management area and the invalid management area, respectively, the management area is updated. If the recording medium is removed at
The invalid management area and the valid management area up to that time are kept as they are. Therefore, the data recorded on the recording medium except for the data immediately after recording can be accessed based on the management data recorded in the effective management area.

[0011]

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

FIG. 2 is a block diagram showing a data processing apparatus according to the embodiment of the present invention. The data processing device 1 processes image data by a central processing unit 2. At this time, the central processing unit 2 secures a work area in the main memory 3 and executes a series of image processing. Furthermore, in response to the user's operation, via the bus BUS,
The image data held in the main memory 3 is output to a card interface (IF) 4 and recorded on an IC memory card 5 via the card interface 4. Further, the image data recorded on the IC memory card 5 is read and processed as needed.

Here, the IC memory card 5 is formed in a card shape while holding a non-volatile memory, and is detachably held by the data processing device 1. Thus, the IC memory card 5 can record the image data in the data processing device 1 and then process the image data in another data processing device.

FIG. 3 is a schematic diagram showing a recording area of the IC memory card 5. In the IC memory card 5, a predetermined area is divided into two equal parts from a head address, and recording information management areas A and B are respectively provided. Set to. Here, the two recording information management areas A and B are alternately set as valid and invalid management areas. If the two recording information management areas are set as valid management areas, management data of data recorded in the user area is recorded. It has been made to be. More specifically, the management data includes a file name, an address, and file attribute information recorded in the user area. On the other hand, when the area is set to the invalid management area, the data of 00h is recorded, and the data is kept in the erased state. The IC memory card 5 allocates a remaining recording area to a user area, and in this embodiment, sequentially records files composed of image data.

When recording image data on the IC memory card 5, the central processing unit 2 executes the processing procedure shown in FIG. 1, and sets the two recording information management areas A and B as valid and invalid management areas, respectively. Set to.

That is, the central processing unit 2 specifies a file name and when a user inputs a write instruction,
The process moves from step SP1 to step SP2, where the head address of the recording information management area A is read. Subsequently, the central processing unit 2 proceeds to step SP3, and determines whether or not the start address of the recording information management area A is 00h, thereby determining whether or not the recording information management area A is an invalid management area. Here, if the recording information management area A is set as a valid management area, a negative result is obtained, and the central processing unit 2 proceeds to step SP4, where management data is transferred from the recording information management area A. read out.

Subsequently, the central processing unit 2 executes step S
The process proceeds to P5, where the empty area of the IC memory card 5 is confirmed based on the read management data, and the image data is recorded in this empty area. Subsequently, the central processing unit 2 proceeds to step SP6, adds the management data of the recorded image data to the management data read from the valid management area, and records the management data in the invalid management area. Further, the central processing unit 2 finally sets the start address of the invalid management area to a significant value other than the value 00h, thereby setting the invalid management area to a valid management area.

Subsequently, the central processing unit 2 executes step S
The process moves to P7, where the management area that has been set as the valid management area is updated with the data of the value 00h, thereby erasing the data in this management area and setting this management area as an invalid management area.

Thus, when the recording information management area A is set as an effective management area, the central processing unit 2
After recording the image data based on the management data obtained from the recording information management area A, the recording information management area B is updated, the recording information management area B is set as an effective management area, and the recording information management area A is set as an effective management area. Set to an invalid management area.

On the other hand, if a positive result is obtained in step SP3, the central processing unit 2 proceeds to step S3.
The process moves to P9, where management data is read from the recording information management area B, and the process moves to step SP5.

Thus, when the recording information management area A is set to an invalid management area, the central processing unit 2
The management data is acquired from the recording information management area B, the image data is recorded based on the management data, the recording information management area B is updated, and the recording information management area A is changed to the effective management area. The management area B is set as an invalid management area.

Accordingly, the central processing unit 2 records the management data by alternately using the two management areas. The central processing unit 2 deletes the file recorded in the user area only by processing for updating the management data. In this case, similarly, the two management areas are used alternately, and the management data is deleted. Has been made to update.

On the other hand, the central processing unit 2 has an IC
When reading image data recorded on a memory card,
The processing procedure shown in FIG. 4 is executed.

That is, the central processing unit 2 designates a file name, and when a user inputs a readout instruction,
The process moves from step SP10 to step SP11, where the head address of the recording information management area A is read. Subsequently, the central processing unit 2 proceeds to step SP12, and determines whether or not the start address of the recording information management area A is 00h, thereby determining whether or not the recording information management area A is an invalid management area. Here, if the recording information management area A is set as a valid management area, a negative result is obtained, and the central processing unit 2 proceeds to step SP3, where management data is transferred from the recording information management area A. After reading, the process moves to step SP14.

On the other hand, if the recording information management area A is set to an invalid management area, a negative result is obtained in step SP12, and the central processing unit 2 proceeds to step SP15, where the recording information management area A is set. After reading the management data from B, the process moves to step SP14.

Thus, the central processing unit 2 reads the management data from the effective management area, accesses the user area of the IC memory card 5 based on the read management data, and reads the file specified by the user. After reading the image data for step SP1,
Then, the procedure goes to 6 to end this processing procedure.

In the above configuration, when the user instructs writing or erasing of a file composed of image data, the recording information management area A is first accessed in the IC memory card 5, and the recording information management area A An effective management area is detected based on the start address.
Further, in the IC memory card 5, management data is read from the detected effective management area, and the user area is updated according to the management data. Furthermore, after the management data is recorded in the invalid management area so as to correspond to the update of the user area, the invalid management area is invalidated in the valid management area. The management area is set, and a series of processing is completed.

Thus, after this series of processing is completed, the user area can be updated based on the newly set effective management area management data. That is, the user writes the file again,
When the user instructs erasure, a valid management area is similarly detected, and the user area is updated according to the management data of the valid management area. Furthermore, after the management data is recorded in the invalid management area so as to correspond to the update of the user area, the invalid management area is invalidated in the valid management area. The management area is set, and a series of processing is completed.

For example, when the user instructs reading, a valid management area is similarly detected, and the user area is accessed according to the management data of the valid management area.

On the other hand, while the file is being written and the management data is being updated, the user
When the C memory card 5 is removed, the setting processing of the valid management area and the invalid management area, which is performed last, is not executed, so that the recording information management areas A and B return to the state before updating the user area. Will be retained. As a result, the user can access the file immediately before updating the user area by accessing based on the effective management area, and can freely access the file.

According to the above configuration, after updating the user area according to the management data recorded in the effective management area, the management data is set in the invalid management area, and the invalid management area is set to the effective management area. By setting the previously valid management area to the invalid management area in the area, even if the IC memory card is removed during the update, the data recorded so far remains the same as the original valid management area. , And significant data loss due to user's erroneous operation can be effectively avoided.

In the above-described embodiment, the case where the head area of the IC memory card is set to the first and second management areas has been described. However, the present invention is not limited to this, and various types of data may be set as necessary. Can be set in the area. In addition, the area may be changed every time the update is performed. In this case, the life of the IC memory card is extended as compared with a case where a certain place is set as the management area by applying to a flash EEPROM having a limited number of rewrites. be able to.

Further, in the above-described embodiment, the case where two management areas are used alternately has been described. However, the present invention is not limited to this, and three or more management areas may be used sequentially.

In the above embodiment, the value 00
h, the management area is set as an invalid area by recording the data of the management area and erasing the data of the management area. However, the present invention is not limited to this. May be set.

Further, in the above embodiment, the IC
Although the case where image data is recorded on the memory card has been described, the present invention is not limited to this, and can be widely applied to various types of data such as audio data and text data.

Further, in the above-described embodiment, the case where an IC memory card is used as a recording medium has been described. However, the present invention is not limited to this, and it is possible to access various recording media such as an optical disk and a floppy disk. Can be widely applied.

[0037]

As described above, according to the present invention, a plurality of management areas are sequentially used to record management data, so that even if a recording medium is removed during updating, the data is recorded by that time. The data can be accessed.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a processing procedure of a central processing unit in a data processing device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the entire configuration of FIG.

FIG. 3 is a schematic diagram illustrating a recording area of an IC memory card.

FIG. 4 is a flowchart illustrating a processing procedure of a central processing unit when reading data.

FIG. 5 is a schematic diagram illustrating a recording area of a conventional recording medium.

[Explanation of symbols]

1. Data processing device 2. Central processing unit 5.
… IC memory card

Claims (4)

[Claims] 1. A data processing apparatus for recording desired data on a removable recording medium, wherein first and second management areas are formed on the recording medium, and one of the first and second management areas is formed. When a valid management area is set and the other is set to an invalid management area, and data is recorded on the recording medium, the management data recorded on the valid management area is used for managing data recorded on the recording medium. A data processing apparatus, wherein after adding data and recording the invalid management area, the invalid management area and the valid management area are set as a valid management area and an invalid management area, respectively. 2. A data processing apparatus for accessing a removable recording medium and reproducing data recorded on the recording medium, wherein a more effective management is performed than first and second management areas formed on the recording medium. A data processing device for detecting an area and accessing data recorded on the recording medium according to management data recorded in the valid management area. 3. A data recording medium access method for accessing a recording medium held detachably, wherein a first and a second management area are formed in the recording medium, and the first and second management areas are When one is set as a valid management area and the other is set as an invalid management area, and data is recorded on the recording medium, the data recorded on the recording medium is added to the management data recorded on the valid management area. Data recording, wherein after adding management data and recording in the invalid management area, the invalid management area and the valid management area are set as a valid management area and an invalid management area, respectively. Media access method. 4. A data recording medium access method for accessing a recording medium held detachably, wherein a valid management area is detected from first and second management areas formed on the recording medium, and An access method for a data recording medium, comprising accessing data recorded on the recording medium according to management data recorded in a valid management area.