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Ordinary PC Hard Disk The design of an ordinary PC hard disk is designed to meet the evolving trend of PC applications—more reliable system data storage, diverse application support, and faster storage response time. 
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.
DVR Dedicated Hard Drive The DVR dedicated hard drive is designed to meet the storage requirements of digital hard disk video recorders for system data and digital image information.
The DVR dedicated hard drive's reliable support of system data is extremely stable. This is related to the system characteristics of digital video recorders. The system of PC-type digital video recorders is rather 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 DVR dedicated hard disk satisfies digital hard disk recorders to store and playback digital images in files. The hard disk is optimized for the input and playback characteristics of digital hard disk recorders to fully support the support of streaming media.
Second, the specific differences
The difference in continuous working time 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 DVR dedicated hard drive 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 are constantly running all year round. Therefore, hard disks must be able to work continuously for a long time. The DVR dedicated hard disk can meet this requirement.
Startup Difference All 3.5-inch hard disks contain the 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 startup current appears at the initial power-on time to complete the hard disk startup. If the external power supply system of the hard disk can not guarantee enough 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 starting current of DVR dedicated hard drive is 2.0A.
Digital hard disk recorders often use multiple hard disks for data storage. For instance, eight hard disks are installed. The start current of a common PC hard disk is 2.8×8=22.4 A, and the minimum power consumption is 22.4 A×12 V=268.8 W. DVR dedicated hard drive startup current 2.0A × 8 = 16A, the highest power consumption is 16A × 12V = 192W. It can be seen that under the same number of hard disks, the DVR dedicated hard disk requires less external power system (the number of DVR dedicated hard disks that can be installed will be more if 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 Thermal Dissipation Differences The operating power consumption here refers to the power consumption of the hard disk when it is in the normal reading and writing state.
The operating power consumption of an ordinary PC hard disk is generally about 14.5 watts, and the operating power of a DVR dedicated hard disk is generally about 8 watts. It can be seen that the operating power consumption of the DVR dedicated hard disk is only equivalent to 55% of the power consumption of the ordinary PC hard disk. The low operating power consumption not only has important significance for the power supply system, but also has important significance for the heat dissipation of the digital hard disk recorder system (operation power consumption 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 running power of an ordinary PC hard disk is 14.5 W×8=116 W, and the total power consumption of the DVR 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. With DVR-dedicated hard disks, the heating situation is much better--lower system cooling requirements make the system more adaptable to the environment.
Transmission difference DVR dedicated hard disk in addition to the traditional PC hard disk transmission mode, also introduced a new transmission mode ---- uninterrupted transmission mode, the maximum transmission mode is 65MB/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.
Third, comprehensive instructions
In summary, the difference between common PC hard drives and DVR dedicated hard drives is that DVR special hard drives take full account of the requirements of digital hard disk video recorders for storage systems. Through the analysis of these requirements, the application of DVR 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.
The difference between ordinary PC hard disk and DVR special hard disk
First, applicable to the environment