Compared with traditional analog video recorders, hard disk video recorders have greater advantages. They are: long video recording time; maximum video recording time depends on the capacity of the connected storage device, which can be several hundred hours; and the number of video and audio channels supported. Many, simultaneous, several, dozens, or even dozens of simultaneous video recording; the quality of the recorded image will not deteriorate over time; more versatile, unlike the traditional analog video recorder.
DVR features different application areas DVRs have different functional requirements. For example, a hard disk recorder for monitoring the industry should have the following functions: compression function, video function, playback function, backup function, network function, pan/tilt, lens control function, alarm input/output. DVRs designed and produced by different manufacturers do not necessarily have all the features listed above.
Video recording technology in DVR In the DVR, the video recording function is associated with many other functions, such as playback function, network function, backup function, etc. Therefore, what kind of video technology is used directly relates to the performance of the entire DVR and Hard disk failure rate. There are two aspects of video technology: First, what kind of file system is used, which is usually related to the operating system used, and it is not easy to choose independently; secondly, under the conditions of the selected file system, how does the application system play the advantages of the file system? While avoiding its weaknesses affecting the entire system.
Currently on the market, PC-based DVR is generally based on the Windows system. The file system generally uses NTFS or FAT32. The file system adopted by the Embedded DVR is closely related to the embedded operating system selected by the manufacturer. The embedded operating systems currently used in Embedded DVR are pSOS, EmbeddedLinux, vxWorks, etc. The file systems used are of many types, such as MS-DOS compatible file system, UNIX compatible file system, Windows compatible file system, and Various proprietary file systems and more.
Which file system is selected as the file system in the embedded hard disk recorder depends on many factors, such as the company's research and development capabilities, financial resources, and the characteristics of the file system itself. It should be said that choosing any file system will not hinder the realization of the recording function in the embedded DVR. Some companies even organize their own file systems to meet their needs. Of course, we don't agree with this because it may take a long time to stabilize, which will increase the time to market for the equipment; in addition, this practice does not meet the requirements. The division of labor in the modern society has become more and more detailed and more and more professional. It is difficult to be as stable and reliable as the file system launched by professional software manufacturers.
After the file system is selected, the platforms available to developers are determined. The rationality of the design of the recording module in the application system of each embedded hard disk recorder manufacturer on the selected platform directly determines the performance of the embedded hard disk recorder after it is brought to market. Some companies have proposed disk pre-distribution technology and multi-partition technology to ensure that fragments never occur during the hard disk cycle recording process. Multi-partition technology can well solve the problem that the disk speed is drastically reduced and the hard disk life is also greatly affected due to the long distance travel between hard disk heads.
Some companies proposed the FAT table and directory zone freezing technology to ensure that the FAT table and directory area will not be destroyed during abnormal shutdown. The basis of this technology is the aforementioned disk pre-distribution technology. Due to the pre-distribution technology of the disk, the FAT table and the directory area are actually in a fixed state, that is, no matter how to write data to the hard disk, the FAT table and the directory area on the hard disk do not need to change. In this way, by modifying the file system software, we can realize that during the recording process, the system does not modify the FAT table and directory area, and achieves freezing of the FAT table and directory area.
In a DVR, there are usually multiple hard disks. When recording, multiple images are recorded on one hard disk as much as possible to stop rotation of other hard disk spindle motors. On the one hand, the hard disk life is prolonged and the hard disk recorder is also reduced in power. Consumption (The power consumption of the hard disk in the sleep state is about 1/10 of normal operation), which is called hard disk hibernation technology. On the basis of hard disk hibernation technology, a low-seeking technology is further proposed to further improve the performance of hard disk recorders and extend the life of hard disks. In view of the gradual damage and detachment of hard disk magnetic particles and related problems, there is a company's creative SMART technology for hard disks ( SelfMonitoringAnalysisAndReportingTechnology: self-monitoring, analysis and reporting technology applied to hard disk video recorders, put forward hard disk failure early warning technology, the principle is through reading and analyzing and comparing hard disk SMART data (ie hard disk heads, disks, motors, circuits and other major parts The monitoring data) automatically warns the user when there is a situation other than the safe value range. In this way, the potential failure of the hard disk can be effectively predicted, the hard disk can be stopped before it fails, and replaced by another more reliable hard disk, thereby greatly improving data security and minimizing the user's loss.
Video Recording Technology in Embedded DVRs Compared to traditional hard disk video recorders, embedded DVRs have introduced many new concepts such as D1 and DCIF resolution support, OSD and channel names that can be flexibly adjusted, and flexible selectable OSDs. Format, perfect exception handling, perfect log function, convenient local cloud mirror control, flexible custom user permissions, timer switch support, remote switcher support, and more. In addition to the above-mentioned feature-rich features, this device data storage technology, that is, video technology, draws on the experience and lessons of the previous generation of devices, and has a completely new way to solve the previous generation of devices and most of the hard disk recorders in the market. Problems encountered. For hard disk recording, the disk pre-distribution technology, FAT table and directory freeze technology, hard disk hibernation technology, low seek technology, and hard disk failure early warning technology are adopted. The adoption of these technologies improves the reliability of system records and prolongs the service life of hard disks.
DVR features different application areas DVRs have different functional requirements. For example, a hard disk recorder for monitoring the industry should have the following functions: compression function, video function, playback function, backup function, network function, pan/tilt, lens control function, alarm input/output. DVRs designed and produced by different manufacturers do not necessarily have all the features listed above.
Video recording technology in DVR In the DVR, the video recording function is associated with many other functions, such as playback function, network function, backup function, etc. Therefore, what kind of video technology is used directly relates to the performance of the entire DVR and Hard disk failure rate. There are two aspects of video technology: First, what kind of file system is used, which is usually related to the operating system used, and it is not easy to choose independently; secondly, under the conditions of the selected file system, how does the application system play the advantages of the file system? While avoiding its weaknesses affecting the entire system.
Currently on the market, PC-based DVR is generally based on the Windows system. The file system generally uses NTFS or FAT32. The file system adopted by the Embedded DVR is closely related to the embedded operating system selected by the manufacturer. The embedded operating systems currently used in Embedded DVR are pSOS, EmbeddedLinux, vxWorks, etc. The file systems used are of many types, such as MS-DOS compatible file system, UNIX compatible file system, Windows compatible file system, and Various proprietary file systems and more.
Which file system is selected as the file system in the embedded hard disk recorder depends on many factors, such as the company's research and development capabilities, financial resources, and the characteristics of the file system itself. It should be said that choosing any file system will not hinder the realization of the recording function in the embedded DVR. Some companies even organize their own file systems to meet their needs. Of course, we don't agree with this because it may take a long time to stabilize, which will increase the time to market for the equipment; in addition, this practice does not meet the requirements. The division of labor in the modern society has become more and more detailed and more and more professional. It is difficult to be as stable and reliable as the file system launched by professional software manufacturers.
After the file system is selected, the platforms available to developers are determined. The rationality of the design of the recording module in the application system of each embedded hard disk recorder manufacturer on the selected platform directly determines the performance of the embedded hard disk recorder after it is brought to market. Some companies have proposed disk pre-distribution technology and multi-partition technology to ensure that fragments never occur during the hard disk cycle recording process. Multi-partition technology can well solve the problem that the disk speed is drastically reduced and the hard disk life is also greatly affected due to the long distance travel between hard disk heads.
Some companies proposed the FAT table and directory zone freezing technology to ensure that the FAT table and directory area will not be destroyed during abnormal shutdown. The basis of this technology is the aforementioned disk pre-distribution technology. Due to the pre-distribution technology of the disk, the FAT table and the directory area are actually in a fixed state, that is, no matter how to write data to the hard disk, the FAT table and the directory area on the hard disk do not need to change. In this way, by modifying the file system software, we can realize that during the recording process, the system does not modify the FAT table and directory area, and achieves freezing of the FAT table and directory area.
In a DVR, there are usually multiple hard disks. When recording, multiple images are recorded on one hard disk as much as possible to stop rotation of other hard disk spindle motors. On the one hand, the hard disk life is prolonged and the hard disk recorder is also reduced in power. Consumption (The power consumption of the hard disk in the sleep state is about 1/10 of normal operation), which is called hard disk hibernation technology. On the basis of hard disk hibernation technology, a low-seeking technology is further proposed to further improve the performance of hard disk recorders and extend the life of hard disks. In view of the gradual damage and detachment of hard disk magnetic particles and related problems, there is a company's creative SMART technology for hard disks ( SelfMonitoringAnalysisAndReportingTechnology: self-monitoring, analysis and reporting technology applied to hard disk video recorders, put forward hard disk failure early warning technology, the principle is through reading and analyzing and comparing hard disk SMART data (ie hard disk heads, disks, motors, circuits and other major parts The monitoring data) automatically warns the user when there is a situation other than the safe value range. In this way, the potential failure of the hard disk can be effectively predicted, the hard disk can be stopped before it fails, and replaced by another more reliable hard disk, thereby greatly improving data security and minimizing the user's loss.
Video Recording Technology in Embedded DVRs Compared to traditional hard disk video recorders, embedded DVRs have introduced many new concepts such as D1 and DCIF resolution support, OSD and channel names that can be flexibly adjusted, and flexible selectable OSDs. Format, perfect exception handling, perfect log function, convenient local cloud mirror control, flexible custom user permissions, timer switch support, remote switcher support, and more. In addition to the above-mentioned feature-rich features, this device data storage technology, that is, video technology, draws on the experience and lessons of the previous generation of devices, and has a completely new way to solve the previous generation of devices and most of the hard disk recorders in the market. Problems encountered. For hard disk recording, the disk pre-distribution technology, FAT table and directory freeze technology, hard disk hibernation technology, low seek technology, and hard disk failure early warning technology are adopted. The adoption of these technologies improves the reliability of system records and prolongs the service life of hard disks.
Hydraulic 4Wd Winches,Two-Stage Planetary Hydraulic Winch,Automactic Screw Cone Braking Winch,Hydraulic Towing Recovery Winch
JINHUA RUNYE TECH. CO.,LTD , https://www.cnirunwinch.com