JPH05173871A - Memory card file management method - Google Patents

Abstract

PURPOSE:To execute the same management method at both times when a memory card is SRAM and flash in a system file-managing with a packet cluster using information area. CONSTITUTION:The area of packet cluster using information (0) consists of a tuple ID 1, a pointer 2 and a packet cluster using information 3. When the memory card is flash, the area of the piece of packet cluster using information (0) is updated into a new area chaining with a tuple chain by each packet so that the file management method of SRAM/flash memory card are made to be the same.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a memory card file management method in a digital still video camera (DSVC).

[0002]

2. Description of the Related Art Conventionally, in a memory card management method for a digital still video camera, a recording area of a normal memory card is divided into a file management area and a data area, and file information and cluster management information are stored in the file management area. Records and manages files. In this file management method for the memory card, the number of clusters used in the file management area as packet cluster usage information,
It has an area for recording the number of remaining clusters, the number of last used packets, and the number of unused clusters at the beginning. The file / cluster usage information is rewritten every time a file is recorded or a file is erased to efficiently manage the file.

[0003]

However, since the static random access memory (SRAM) card can be erased in byte units, the packet cluster usage information can be updated, but the flash memory memory card can be erased in byte units. Therefore, there is a problem in that the packet cluster usage information cannot be file-managed in the same system as the SRAM. The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a memory card management method capable of managing both a flash memory card and an SRAM in the same system.

[0004]

In order to achieve the above object, the present invention uses, as usage information of packet clusters in a memory card, the number of remaining clusters, the number of used clusters, and the last used packet number in the recording area of the memory card. , The head unused cluster number etc. is recorded and the file is managed, and when the memory card is a flash, the above-mentioned packet / cluster usage information area is updated to a new area linked by a tuple chain for each packet recording. It is the one.

[0005]

According to the present invention, therefore, the area of the packet / cluster usage information of the file management information of the memory card is updated to a new area by a tuple chain for each packet recording if the card is a flash, so that the SRAM card and Flash cards can be done with the same file management system.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a packet
It shows a recording area of cluster usage information. Figure 1
, 1 is a tuple ID (identifier), 2 is a pointer, 3
Is an area of packet cluster usage information, and
The packet cluster usage information (0) is composed of 3 to 3. Four
Is a recording area of packet cluster usage information (1) and 5 is a recording area of packet cluster usage information (2). When a new packet is recorded and the controller (not shown) updates the packet cluster information, the tuple ID of the packet cluster information is searched, and if the card is SRAM, the pointer is a hexadecimal FF. Since the tuple chain ends, the packet cluster information is updated for each area, and if the card is a flash, the pointer points to the beginning of the next packet cluster usage information area, and this pointer points to If it is a tuple ID of packet cluster usage information,
Also, the tuple ID pointed to by the next pointer is read, and the tuple chain is searched in this way. If the tuple ID pointed by the pointer is not the tuple ID of the packet cluster use information, a new packet cluster is used in that area. Write information. In this way, the update of the packet / cluster usage information of the flash card is written in the next area for each packet recording.

[0007]

As is apparent from the above embodiment, the present invention updates the area of the packet / cluster usage information of the file management information of the memory card to a new area by tuple chain for each packet recording if the card is a flash. By doing so, it is possible to efficiently manage files in the SRAM card and the flash card using the same file management method.

[Brief description of drawings]

FIG. 1 is a diagram showing a recording area of packet cluster usage information in an embodiment of the present invention.

[Explanation of symbols]

1 ... Tuple ID, 2 ... Pointer, 3 ... Packet cluster usage information, 4 ... Packet cluster usage information
(1), 5 ... Packet cluster usage information (2).

Claims (1)

[Claims] 1. Packet cluster usage information for recording the number of remaining clusters, the number of used clusters, the last used packet number, the first unused cluster number, etc. in the recording area of the memory card as the packet cluster usage information in the memory card. In a file management system that manages files by area, when the memory card is a flash, the packet / cluster usage information area is set for each packet recording,
The static random access memory (SRA) is updated by updating to a new area linked by tuple chain.
M) A memory card file management method characterized in that files are managed in the same system for the card and the flash memory card.