A lot of people have asked if there is a good monitoring hard drive, do we use an ordinary PC hard drive to the hard disk recorders not? On this issue, in fact, not a problem, but a comprehensive review of stability reliability problems. This is what we said. We generally use hammers to nail nails. Occasionally, when we do not have a hammer, we can use the pliers to pick up a nail. But the effect may be different.
Speaking of this topic, let's talk about the failure rate of an embedded hard disk video recorder (abbreviated as DVR). After incomplete statistics, about 60% of hard disk video recorders come from hard disk read/write failures. Each time a hard disk fails, our engineering company must provide on-site service. Obviously, on-site service will increase the service cost, and it will not be easy to earn. At the same time, some profits were transferred to the Ministry of Transportation and Welfare. At the same time, it is also a loss of brand image to the engineering company.
From two aspects:
First: For the engineering firm, when the hard disk you installed has fewer problems, your profits will increase, your service costs will decrease, and the projects you do will make customers more comfortable. The engineering firm no longer has to worry about frequent on-site service due to problems with the hard drive, which will cause the service cost to increase dramatically and even result in a loss of the entire project.
Secondly, for end users, if there is less hard disk failure, then the risk of data loss will be reduced, the system will be more secure, and the monitoring system will really play its due role.
The following is not what we usually use for home desktop or notebook hard drives, but monitoring dedicated hard drives. They mainly provide high-reliability, customized performance mass storage products for security and defense industry monitoring system users or special users (Internet cafes, KTVs) that need continuous operation, enabling users to store and manage their own monitoring videos more easily. TV shows, videos, photos and documents.
Although these monitor-dedicated hard disks are indistinguishable in appearance from ordinary PC hard disks, monitoring dedicated hard disks for functions and parameters is more suitable for professional use. The differences are as follows:
Applicable environment
The design of common PC hard drives is designed to meet the growing trend of PC applications - more reliable system data storage, diverse application support, and faster storage response times.
More reliable system data storage means that under a hard disk (including array) system, the hard disk system can guarantee the reliable and safe storage of multiple system data. The diversity of application support means that hard disks can support multiple application environments: PC desktop applications, multimedia applications, and games.
The design of the monitoring dedicated hard disk is to meet the storage requirements of the digital hard disk video recorder for system data and digital image information.
The reliable support for monitoring system data by dedicated hard disks is extremely stable. This is related to the system features of digital video recorders. The system of PC-type digital video recorders is quite simple (multi-system coexistence does not occur). The applications supported in the system are specifically customized for digital video recorders (and there are no multiple applications.) Coexisting situation); and embedded digital hard disk recorders generally do not have the concept of the system, the system is built-in, and has nothing to do with the hard disk.
The monitoring dedicated hard disk satisfies the storage and playback of digital images by the digital hard disk recorder in a file format. The hard disk is optimized for the input and playback characteristics of the digital hard disk recorder to fully support the support of streaming media.
Hard disk life is different
Ordinary hard drives start at full speed when they are powered on. The instantaneous current may reach 2 amps or even higher. The monitoring hard disk will start to accelerate slowly, and the starting current will be controlled under 2A. Because the monitoring system usually installs more than one hard disk, it 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.
In addition, the monitoring system generally does not require high speed transfer of hard disks, but frequently reads and writes small amounts of data.
Therefore, it is necessary to optimize the design of the reading and writing characteristics of the monitoring system on the magnetic head read-write mechanism to extend the life of the magnetic head. 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.
Continuous operating time difference
The design of an ordinary PC hard disk is based on 8×5. 8×5 refers to an ordinary PC hard disk working 8 hours a day, working 5 days a week (hard disk work refers to the hard disk is in read-write state. Need special attention is the hard disk has two states after power-up: working state and waiting state The work state is that the hard disk reads and writes, and the waiting state is that the hard disk has not been read or written but is on standby.)
The monitoring dedicated hard disk is designed and developed according to the 24×7 enterprise environment requirements. 24 × 7 is to work 24 hours a day, work 7 days a week (that is, continuous work). Therefore, regular PC hard disks are not suitable for continuous reading and writing over a long period of time. If regular PC hard disks are required to be read and written for a long time, they will greatly damage the hard disk, causing the hard disk to have abnormal sounds, read/write errors, and work suspension and other problems. Causes the hard disk to eventually become damaged.
Digital hard disk video recorders operate continuously all the year round. Therefore, it is required that the hard disk must be able to work continuously for a long time. To meet this requirement is to monitor dedicated hard disks.
Start difference
All 3.5-inch hard disks contain a motor system. Therefore, when the hard disk is powered on, it is similar to the case where the motor is powered on: that is, a large starting current appears at the initial power-on time to complete the hard disk startup. If the external power supply system of the hard disk fails to guarantee sufficient current support when the power is turned on, the hard disk will fail to start, resulting in the hard disk being unavailable. And if this happens many times, it can easily cause damage to the hard disk.
Because the power supply of the hard disk motor is satisfied by the DC 12V of the external power supply system, the 12V DC current is used as the standard when evaluating the HDD startup current. Ordinary PC hard disk startup current is generally between 2.8A ~ 3.2A. The maximum current for monitoring a dedicated hard disk is 2.0A.
Digital hard disk recorders often use multiple hard disks for data storage. For example, eight hard disks are installed. The start current of a common PC hard disk is 2.8×8=22.4A, and the minimum power consumption is 22.4A×12V=268.8W. Monitoring dedicated hard disk startup current 2.0A × 8 = 16A, the highest power consumption is 16A × 12V = 192W.
It can be seen that monitoring the dedicated hard disk requires less external power system in the same number of hard disks (the number of monitoring dedicated hard disks that can be installed is greater under the external power supply with the same output power).
Note: In the case of the above example, if the external power supply system can only guarantee the power supply of 250W, some hard disks will be recognized when ordinary PC hard disks are used. Some hard disks cannot be identified and have no regularity.
Operating power consumption and cooling differences
Here, the operating power consumption refers to the power consumption of the hard disk in the normal reading and writing state. The operating power consumption of a common PC hard disk is generally about 14.5 watts, and the operating power consumption of a dedicated monitoring hard disk is generally about 8 watts. It can be seen that the monitoring dedicated hard disk operating power consumption is only equivalent to 55% of the normal PC hard disk power consumption, low operating power consumption is not only important for the power supply system, but also important for the heat dissipation of digital hard disk recorder system (run power About 75% of it will be converted into heat energy).
In a digital hard disk video recorder, if eight hard disks are installed, the total power consumption of an ordinary PC hard disk is 14.5 W×8=116 W, and the total power consumption of the monitoring dedicated hard disk is 8 W×8=64 W. If you use an ordinary PC hard disk, you can imagine such a high heat source in a small space such as a digital hard disk recorder. The heat dissipation requirements for the system are very high. To protect the hard disk, there is a reasonable ambient temperature (0~60°C). The hard disk system must be effectively cooled. The use of dedicated hard drives for monitoring, the situation is much better heat - reducing system cooling requirements make the system more adaptable to the environment.
Transmission difference
In addition to the transmission mode of the traditional PC hard disk, the monitoring dedicated hard disk also introduces an updated transmission mode, the uninterrupted transmission mode, which is a maximum of 65 MB/s. Through the introduction of uninterrupted transmission mode, the support for streaming media on the hard disk is more reliable, which fully guarantees the fluency and stability of playback of digital hard disk recorders while recording. This is a feature that other hard drives do not have.
In summary, the difference between common PC hard disks and monitoring dedicated hard disks is that monitoring dedicated hard disks take full account of the requirements of digital hard disk video recorders for storage systems. Through the analysis of these requirements, the application of monitoring dedicated hard disks to digital hard disk recorders is further improved. Sexually solved the storage problem of digital hard disk video recorders fundamentally, making the reliability and stability of digital hard disk recorders a new level.
Stability is higher than everything, monitoring dedicated hard drives provide the most stable and secure data storage media, reduce engineering service costs, reduce end-user data loss risk, is the most loyal partner of the monitoring system industry, KTV, Internet cafes.
Multi Heads Laser Cutting Machine
Multi heads laser cutting machines are CO2 Laser Engraver Cutter with 2, 4 or 6 laser heads. These laser heads can work at the same time, users can also turn off any of the laser head by simply press the buttons at the side of machine. It mainly suit for mass engrave cut of small objects, like acts crafts, leather for shoes, etc. The most popular is double heads laser engraver cutter with two laser heads. If two laser heads work at the same time, each laser head responsible for half of the worktable, thus can double the processing efficiency. You can also set use only one of the laser head to work the whole working area, this function also allow user engrave cut big items.
Usually the laser power for multi head laser machines is the same. But sometimes users may need different power for each laser power, like one head with small power for engrave work, one head with big power for cut work, it is also ok.
Applicable materials:
Almost all nonmetal materials such as wood, MDF, acrylic, double color board, Plexiglas,common glass, bamboo, rubber, marble, granite and tiles, leather cloth etc.
Marble and glass only engrave work.
This multi heads CO2 laser engraver cutting machine can do not work on any metal.
Applicable industries:
Advertising industry, Billboards, artistic gifts, crystal ornaments, paper-cut, bamboo and wooden product, garment and leather, embroidery, decoration and upholster industry.
Multi Heads Laser Cutting Machine,Double Heads Laser Cutting Machine,Dual Heads Laser Machine,Double Heads Laser Cutter
Jinan Transon Cnc Equipment Co., Ltd. , https://www.csjiguang.com