How to optimize HD video surveillance storage when purchasing

When we buy high-definition monitoring equipment, whether it is hybrid DVR or network NVR, we must match the storage hard disk for high-definition surveillance video carrier, then we often ignore the choice of hard disk, that as long as the capacity meets the requirements can be, in fact, In the field of high-definition surveillance, in addition to the large-capacity hard disk applications, there is excellent stability and dedicated features, blind choice will only cause unnecessary trouble. In a mature monitoring system, once the possibility of a problem is out of the hard disk, and the solution is more difficult, for the seller, if the hard disk in the monitoring system has more problems, the service cost will increase, and the profit will be increased. Will reduce, and for our buyer, if the hard disk failure is more, then the risk of data loss increases, the system becomes insecure, did not play the role of the monitoring system really play a due role.

We have done calculations, according to the current digital high-definition video surveillance to the most basic 720P as the standard, the most economical hourly video recording can be compressed to about 3GB capacity. Taking this as an example, according to the calculation of monthly storage time requirements, such a data can be obtained: a single monitoring storage 2.16T, eight monitoring about 17T (17000G) capacity. However, the huge hard disk capacity consumption is not terrible. What is terrible is the ability to process video streams in parallel. What is even more frightening is that the monitoring system continuously reads and writes hard disk data year after year, which is a great test for hard disks.

Going out of the erroneous zone: Reasonable choice of high-definition surveillance hard drives When selecting high-definition surveillance devices, we most often overlook the choice of storage devices. Usually we only focus on the capacity and speed, which is completely incorrect, of course, high-definition monitoring With huge data capacity requirements, high-capacity hard drives are indispensable, but we should focus more on monitoring the practical operation of hard drives. Speed ​​is not important, and stability and optimization of high-definition code streams are the features we need.

Compare: Ordinary PC hard disk? Enterprise hard disk? Monitor dedicated hard disk?

From the view of continuous working time: Ordinary PC hard disk is designed for 5x8 hours of continuous working time; and the dedicated hard disk for monitoring is designed to meet the storage requirements of hard disk video recorder for system data and digital image information, which can reach 7x24 hours of working time; maybe someone Will ask enterprise-class hard drives and DVR series hard drives are designed using 7x24 hours of work time, is it safer and more reliable to use enterprise-class hard drives instead of DVR hard drives? The answer is no!

First of all, we must understand: Monitor the characteristics of the hard disk is specifically designed for video and data read and write different modes, not only to ensure the smooth video and reliable and highly integrated data, but also effectively improve the video's time or quality. PC hard disk design is designed to meet the development trend of PC applications, more reliable system data storage, diverse application support, and faster response time for storage, while corporate hard disks are suitable for disk arrays, RAID protection, data snapshots, NAS, or All kinds of storage devices that require large capacity. Obviously, PC hard drives are not suitable for monitoring during continuous working hours. Although enterprise-class hard drives and monitoring hard drives are optimized for long-term operation, enterprise-level RAID is more optimized and seeks faster than monitor-level hard drives. This kind of hard disk can't be used instead. The fundamental design needs are not the same. It's like using a professional video card to replace a home video card. Although all of them have video output, their functions and performance are quite different.

Why HD monitoring to choose to monitor dedicated hard disk?

High-definition monitoring system Compared with traditional monitoring systems, the higher the resolution and the higher definition, the greater the code stream will be when the data is transmitted, which will greatly increase the hard disk pressure. In addition, the multi-channel parallel stream optimization technology, only Can be reflected in the monitoring dedicated hard disk, which is the main functional means of sharing the pressure of the hard disk, in addition to multiple hard drives, even if the high-definition monitoring system on the hard disk transfer speed requirements are not very harsh, but will frequently read and write small amounts of data , Monitoring dedicated hard disk in the head read and write mechanism for the monitoring system read and write features to optimize the design of structure, in order to extend the life of the head. Here we give an example to analyze the important role of monitoring dedicated hard disk in high-definition monitoring system:

First, the life of the hard disk: Storage life is the key to control the cost of the monitoring system, the ordinary hard disk will start at full speed when starting, the instantaneous current may reach 2A. The monitoring hard disk will start slowly and the starting current will be controlled below 2A. Because the monitoring system usually installs multiple hard disks, this will generate a large starting current at the instant of startup. If it is an ordinary hard disk, the power supply will be unbearable and even burned. The theoretical average failure-free running time of monitoring hard disks is much longer than that of ordinary hard disks, and the stability and reliability are even higher.

Second, the difference between continuous working hours: As we mentioned before, ordinary PC hard drives are not suitable for long continuous read and write, especially in high-definition monitoring system storage pressure, using ordinary PC hard drives for a long time continuous reading and writing will be great The damage to the hard disk causes the hard disk to have abnormal sounds, read/write errors, and work stoppages, which can cause damage to the hard disk. For years of continuous operation, it is required that the hard disk must be able to work continuously for a long period of time. To meet this requirement is to monitor the dedicated hard disk. Operational power consumption and cooling difference III. Power consumption and heat dissipation: As a high-definition monitoring medium, the storage pressure is generally high. The operating power consumption of an ordinary PC hard disk is generally about 14.5 watts. The operating power consumption of a dedicated monitoring hard disk is generally about 8 watts. , It is only equivalent to 55% of the power consumption of ordinary PC hard drives, and about 75% of the operating power will be converted into heat energy. Using dedicated hard drives for monitoring not only consumes lower power, but also generates much heat. ---- Reduced system cooling requirements Make the system more adaptable to the environment. Transmission differences IV. Transmission and performance differences: In addition to the traditional PC hard disk transmission mode, dedicated HDDs have also introduced an updated transmission mode, the uninterrupted transmission mode. The maximum transmission mode is 65 MB/s. Through the introduction of uninterrupted transmission mode, the support of the hard disk for streaming media is more reliable, which fully guarantees the fluency and stability of the playback of the digital hard disk recorder while recording, which is a feature not possessed by other hard disks. In addition, high-definition stream optimization is also a unique feature of the monitoring hard disk for high-definition monitoring, which can better enhance the performance and stability.