DVR hard disk recorders to buy tips

The following three alternative points of view are proposed for your reference to your project and end users.

1. Performance meets project requirements

When selecting a DVR, first of all determine the equipment to use? Is it a security monitoring project (such as buildings, airports, museums, etc.) or a bank teller project that requires high video speed? The products used for security monitoring projects are characterized by complete functions, good network transmission functions, and slow recording speed. However, by linking with sensors and motion detection, video resources can be allocated to the most needed places. The product used in the bank teller monitoring project is characterized by high recording speed, each of which can reach 20 frames or more. It must have the functions of real-time recording, multi-channel video and audio, and audio and video synchronization, but due to the workload in image processing. Very large, so its network and other functions are relatively weak. Different types of DVRs should be used in different types of monitoring projects to avoid wasting costs and operating performance.

For example, if a device suitable for a security monitoring project is improperly planned in a bank teller project, the recording speed will not be able to meet the user's needs. Because bank teller projects require high computer configuration and hard disk capacity, the cost is relatively high. To put it another way, if products that are suitable for bank teller projects are used in the planning of security monitoring projects, the cost will be wasted, and security monitoring projects will often have transmission and sub-control requirements. This is exactly what the bank teller project system is. Weaknesses. At the same time, it is necessary to remind everyone that hard disk video recorders are "one machine for many" devices, not "one machine for all" devices. There are often users who hope that a device can solve all the problems, but in fact, the current level of computer software and hardware technology is still basically unable to fully meet the requirements of users. Because the computer's bus transfer speed, CPU processing speed, and hard disk recording speed are limited, unless you use a supercomputer, you cannot transfer, process, and record so much data at the same time. However, the price involved is quite high. Users are unacceptable.

2. After stability verification

If the stability of the DVR is not enough, failing to record images at an important moment will cause many serious problems. The stability of DVR can mainly be considered from two aspects: hardware structure and software program. Given that there are many PC-based types of DVRs on the market today, the following is only an example of PC-based models:

1. Hardware structure:

DVRs are multi-input and the hardware can be multi-card or single-card. Sometimes, in order to improve product performance, such as increasing the recording speed, multi-card mode will be used, but it is easy to cause conflicts between hardware, as mentioned above, bank teller project equipment often have such problems. In general, the smaller the number of capture cards used, the better, because of the high degree of integration of single-card mode, the stability is also better than multi-card mode. In addition, the heat dissipation problem of the equipment is also a factor to consider.

2. Software program:

Whether the software program is well-written or not must be verified through long-term operation and operation, and in particular, attention should be paid to whether the hard disk is stable or not. One of the key advantages of the DVR is that it does not require constant replacement of storage media. It constantly refreshes the hard disk, removes out-of-date data, and saves the latest data. However, some DVRs often have problems when performing this process. This is often a problem. It is the easiest to ignore by the project and users. Therefore, choosing the products that have been widely used and that users reflect well may be the simplest method.

3. The feasibility and additional cost of additional hard disk

In general, the DVR's own hard drive has insufficient capacity. For example, a hard disk recorder used for bank teller monitoring requires 30-day images to be stored for at least 200 hours. If an 8-channel real-time DVR is used, even if the image data volume per frame is compressed to 2K, the required hard disk capacity is at least 300GB, and the amount of image data is compressed to 2K, it is difficult to say whether the image quality is acceptable. Therefore, whether or not the hard disk can be added to expand the storage capacity becomes an important issue. In addition, since the cost of hard disks is still high at present, it is also necessary to consider whether the subsequent additional costs can be loaded.