According to incomplete statistics embedded hard disk video recorder (SDVR) about 60% of the problems from the hard disk, with the development of new technology to develop video data generated by the data into a geometric rate of growth. These special hard disk monitoring (hereinafter referred to as: SDVR special hard disk) in addition to the product logo generally speaking a single look from the exterior and the common PC hard disk is not what difference, but the function of SDVR and parameters on specific hard drive is more suitable for professional use, the following Xiaobian to explain briefly the difference between the hard disk and the hard disk monitoring system.
1 continuous working time difference
General PC hard drive design with 5*8 as the foundation; 5 * 8 refers to the ordinary PC hard disk working 8 hours a day, 5 days a week (hard work is to refer to the hard disk in a state of reading and writing. Special attention is needed to power after the hard disk has two states: working state and wait state, which is the working state of the hard disk read and write, wait state is not hard to read and write but work on standby. )
The SDVR special hard disk is designed and developed according to the enterprise level environment of 24 * 7. 7 * 24 is a continuous work for 24 hours a day, 7 days a week (that is, continuous work). Ordinary PC hard disk is not suitable for a long time for a long time to read and write, ordinary PC hard disk read and write for a long time will appear abnormal sound, read and write errors, work suspension and other issues, and thus cause the loss of data.
Digital hard disk recorder requires perennial running, and therefore requires storage of video data must first meet the hard disk can be a long time for a long time to work, can meet the requirements of the SDVR dedicated hard disk.
2 power management (start up difference)
All of the 3.5 inch hard disk contains two motor system (spindle motor and magnetic arm motor), so the hard disk power and motor starting when power up the situation is similar: in the initial period of time and will appear larger starting current to complete the hard disk boot. If the external power supply system when the hard disk can not protect enough current support, the hard disk will start failure, leading to the hard disk is not available. And if this occurs repeatedly, it is easy to 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 current of the DC 12V is the standard of the evaluation of the starting current of the hard disk. General PC hard disk boot current is generally between 2.8A ~ 3.2A. SDVR dedicated hard drive up to the highest current 2.0A.
Digital hard disk video recorder is often used for data storage, in order to install 8 pieces of hard disk as an example: ordinary PC hard disk boot current 2.8 x 8=22.4A, the minimum power consumption is 22.4A * 12V=268.8W. SDVR dedicated hard disk boot current 8=16A * 2.0A, the maximum power consumption of 16A x 12V=192W. It can be seen that the lower SDVR special hard disk external power supply systems in the same number of disk case (the number can be installed in the same external power output power under the support of the special SDVR hard disk will be more).
The development and design of security monitoring and control environment products are usually divided into the following levels according to the level of reliability:
1 Civil reliability: low reliability and low cost design level, to meet the daily consumption demand; usually the equipment according to stability design of 5X8 hours, even when there is no need to consider in the design of reliability, as long as you can achieve it. The operation of the system can generally meet the reliable operation of working every day about 8 hours, and frequent downtime, reduction, business interruption, products are usually realized by pure software.
2 commercial grade reliability: design level, reliable medium medium cost, the stability of the equipment can meet the number of days of reliable operation, but the system will appear with the machine, reset and other phenomena, business products are usually with occasional interruption, the combination of hardware and software implementation.
3 operational reliability: the system according to 7X24 hours of uninterrupted operation design, high reliability, minimal downtime, reset phenomenon. At the same time, business should not be interrupted, business interruption is regarded as the product of the accident, the product is usually used in pure hardware, hardware design in the design of redundancy, load balancing and other reliability design measures.
4 reliability: aerospace grade system design by error free, any downtime reduction phenomenon, should not be of high reliability, products are usually implemented by hardware or dedicated hardware, multi redundancy, high redundancy design hardware business.
For video surveillance platform products, some of current video surveillance software platform products are actually only equivalent to the level of reliability of civil level, forming the situation there are many reasons, pure software video monitoring platform products due to uncertainty of the hardware, in the development process had to consider the cross platform technology, make the product development too complex. And has been in the deployment of the product, may be due to low reliability caused by hardware platform, may also be due to software of hardware to reduce the reliability of the platform; but no matter what kind of condition the reliability issues are security risks can not be tolerated for customers.
And the equipment of the video surveillance platform to enable the platform to make a comprehensive platform for developers to consider the hardware. Software reliability design, but also in accordance with industry standards to define the reliability of the product. In addition the development of the hardware platform of the predetermined backbone will avoid the complexity of software development, which can simplify the design in accordance with the criteria of reliability, in the premise of product performance requirements, the design may be simple products, do not need to consider such as cross platform software of customers with the reliability requirements of independent ability. For the production of commercial grade, operation