Data storage method of flash memory card in video monitoring equipment, and system thereof

Abstract

The invention relates to video monitoring, and discloses a data storage method of a flash memory card in video monitoring equipment, and a system thereof. With the method, the space utilization rate of the flash memory card is high, video data access efficiency is high, and the stability when files are frequently read and written is high. According to the invention, a storage file comprising an integral number of storage blocks and an index file comprising an index head and index entries are configured in the flash memory card, wherein the size of the file is invariable; the storage blocks are corresponded to the index entries on to one; the index head comprises a read indicator and a write indicator. The method comprises the steps that: according to the index entries, data is circularly written into a current storage block, or a current storage block is covered by the data; according to the information of the current storage block, the index head and the corresponding index entry information are updated.

Description

technical field [0001] The invention relates to the field of video monitoring, in particular to data storage technology. Background technique [0002] Flash memory card is a memory that uses flash memory technology to store electronic information. It is generally used as a storage medium in digital cameras, handheld computers, MP3 and other small digital products. According to different manufacturers and different applications, flash memory cards include SM cards and CF cards. , MMC card, SD card, memory stick, XD card and micro hard disk, etc. [0003] Currently, when a video surveillance device is storing data, each time the video surveillance device has a storage request for data, the flash memory card will create a separate data file and an index file for storage. The Chinese patent application number is CN200810184014.8, which discloses a data The method for long-term pre-recording of a storage device includes: calculating the space for storing the pre-recorded data ac...

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Problems solved by technology

[0004] The inventors of the present invention found that the above-mentioned data storage method requires constant modification of system file data due to the frequent creation of files, such as the File Allocation Table (File Allocation Table, referred to as "FAT") table, or frequently updates the data index linked list in the memory. Damage to the key data area will cause the storage of the entire flash memory card to be paralyzed, so that the entire data will be lost after formatting, greatly reducing its stability, low utilization of storage space, and cumbersome management

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