The Difference Between HDD MDVR And Ordinary Hard Disk Recorder Some Unique Design About Car Video Recorder Mobile DVR

   In recent years, there has been a wide variety of vehicle HDD video recorder (vehicle HDD MDVR) on the market, as a segment of the traditional embedded hard disk video recorder, vehicle-mounted hard disk video recorder (the definition of vehicle-mounted hard disk video) also ushered in the favor of many security enterprises.HDD mobile DVR in the security industry is not a new product of The Times, but said the technical content, I'm afraid only really do car hard disk video recorder people can understand.

1.What difference does HDD mobile DVR have with ordinary hard disk recorder?

   Ordinary hard disk video recorder using 220V alternating current, voltage and current stability is relatively stable, and because the ordinary hard disk video recorder position environment is fixed, the relative vibration opportunity is almost no, so ordinary hard disk video recorder seismic function can be ignored. But the HDD Mobile DVR is different. First of all, the voltage and current on the car can not be understood according to conventional thinking, the voltage on the car is 12/24V, but in fact, the 12V car is not 12V voltage regulator, 24V is the same, so the design of the power board is very important, the design of the power board to take into account many aspects.

2.How to design the power supply of HDD MDVR?

   In order to ensure the normal work of the HDD mobile dvr, we must first ensure the stability of the output power of the power supply board.

   Narrow in a fixed voltage, the input voltage current basic smoothly, furthermore, from the aspects of electrical output power to the input power, so the ordinary hard disk video recorder only need an adapter can power aspect, an adapter troupe is a transformer and a filter circuit, a bit of conscience and a protection circuit, conscienceless protection circuit is not installed, Because it's cheaper. So ordinary hard disk recorder cost and maintenance cost is relatively low.

   But for the HDD mobile dvr, the first thing to do is dynamic voltage and current narrowing refinement. How to ensure the normal operation of the HDD mobile dvr, stable voltage and current is very important, but on the other hand, the input power of the equipment is fixed, by W=U*I know, voltage changes when the current is also changing, voltage and current change direction is always opposite. So if the starting voltage is made lower, the relative starting current will increase. On the macro is so simple, but can do the stable function and ensure the normal operation of equipment, it would be a need to make great efforts one time, the first is to protect the circuit design, want to know the power of the HDD mobile dvr boards within 1 hour to withstand the impact of the hundreds of times, protection circuit do bad, light power panel is damaged, or breakdown power panel directly burned motherboard.

3.How is the seismic design of the HDD mobile dvr?

   The anti-seismic design of the HDD mobile dvr is very important, in fact, how to protect the hard disk. Because the current hard disk is a mechanical shaft drive, the distance of the read/write head and disk only a few microns, if see with the naked eye, read/write head is posted on disk, but you should know that even if you don't understand the hard disk 5400 RPM hard drive to turn at least 90 times per second, if the read/write head is posted on the above, it won't be long before, the read/write head is grinding didn't. Such a close distance, if the earthquake resistance is not good, as long as the read and write head even a little bit of vibration, the hard disk bad track, serious read and write head crash (hard disk terminology). So hardware seismic is very important.

4.How is the HDD mobile dvr fault tolerance error correction designed?

Re: The fault tolerance and error correction ability of hard disk is a difficult problem which has been strived to solve in IT hardware industry or software industry since the advent of hard disk. For an embedded system, it is very difficult to achieve perfect fault tolerance and correction design! However, for the design intention of embedded system: embedded system is originally designed for the pursuit of better stability and execution speed, but there is a non-negligible problem is poor portability, resulting in the design can not be changed too much. So the way it was first designed is very important. Read and write control ability is an effective method for hard disk fault tolerance and correction in embedded system.