Digital hard disc recorder file managing method for preventing file fragment production

Abstract

The method of preventing generation of file fragment in digital hard disc video recorder includes mainly the file pre-creating process, the first video recording data file writing process and the video recording data file covering and writing process. The file pre-creating process includes hard disc formatting, creating subarea, and pre-creating 2 index files and N data files of M bytes size; the first video recording data file writing process is to write compressed video and audio data flow into one of the created data files until finishing all the data files on the hard disc connected to the hard disc video recorder; and the video recording data file covering and writing process is to store the newly input compressed video and audio data flow to the earliest data file circularly. The present invention has the advantages of no generation of file fragment and no degradation of access efficiency of video recording hard disc data.

Description

technical field [0001] The invention relates to a hard disk file management method in an embedded system, in particular to a digital hard disk video recorder file management method for preventing file fragments. Background technique [0002] We know that DVR (digital video recorder, digital hard disk recorder) needs to record a large amount of video and audio compression data streams to the hard disk (including mobile hard disk) in real time. The traditional DVR file management method is as follows: first format the hard disk and create partitions, when the DVR recording is working, store the data of a fixed period of time (such as 30 minutes) as a file. That is, a file is created when a channel starts recording, and the compressed data of the channel is stored in the file. When the specified time is up, the writing to the file ends, and then a new file is created to continue writing the compressed data. In the new file, due to the change of the monitoring scene, the length...

AI Technical Summary

Problems solved by technology

Among them, the seek time constituted by the mechanical movement of the magnetic head greatly affects the efficiency of file reading and writing, because the time required for reading and writing the data of a sector located under the magnetic head is only the same as moving the magnetic head to another track and then reading and writing. One-fifth of the time required for data), in severe cases, it may even cause the system to overload during the process of deleting and creating files, and it is too late to record new video data, resulting in loss of video data and shortening the life of the hard disk

Moreover, digital video recorders for monitoring applications generally require 24-hour uninterrupted work, and hard disk defragmentation operations are not allowed during the work process.

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