What Are the Definitions and Differences Between PC Hard Disk and DVR Special Hard Disk

When we buy monitoring equipment, whether PC DVR or embedded DVR, we should match the carrier storing hard disk for monitoring and video recording. At this time, we often ignore the choice of hard disk and think that as long as the capacity meets the requirements, in fact, in the field of DVR, the application of hard disk is not only large capacity, but also excellent stability and blind choice, May cause unnecessary trouble.

For the mature DVR system, once there is a problem, 60% of the possibility comes from the hard disk. Generally, the problem of the hard disk is relatively serious. For dealers, after there are many hard disk problems in the monitoring system, the service cost will increase and the profit will be reduced. For our users, if there are many hard disk failures, the risk of data loss will increase, The system became unsafe and did not play the role of monitoring system. In this regard, hard disk products exclusively positioned for surveillance video are undoubtedly the most qualified. The following is a detailed interpretation of the selection of hard disk for DVR system:

Meaning of PC hard disk and DVR special hard disk:

● ordinary PC hard disk

The design of ordinary PC hard disk is to meet the continuous development trend of PC applications - more reliable system data storage, diversified application support and faster storage response time. It is designed for 8x5 hours of continuous working time. More reliable system data storage means that under a hard disk (including array) system, the hard disk system can ensure the reliable and safe storage of a variety of system data. Diverse application support means that the hard disk can support a variety of application environments: PC desktop applications, multimedia applications and games.

● DVR dedicated hard disk

DVR special hard disk is designed to meet the storage requirements of digital hard disk video recorder for system data and digital image information, which can reach 7x24 hours. The reliable support of DVR dedicated hard disk to system data is extremely stable. This is related to the system characteristics of digital hard disk video recorder. The system of PC digital hard disk video recorder is quite single (there can be no coexistence of multiple systems), and the applications supported in the system are specially customized for digital hard disk video recorder (there is no coexistence of multiple applications); The embedded digital hard disk video recorder generally does not have the concept of the so-called system. Its systems are built-in and have nothing to do with the hard disk. DVR special hard disk is excellent for digital hard disk video recorder to store and playback digital images in the form of files. According to the characteristics of input and playback of digital hard disk video recorder, the hard disk is optimized to fully ensure the support of streaming media.

Enterprise hard disk and DVR dedicated hard disk are irreplaceable:

Some people will ask that both enterprise hard disk and DVR series hard disk are designed with 7x24 hours of working time. Is it safer and more reliable to use enterprise hard disk instead of DVR hard disk? The answer is no! First of all, we should understand that the DVR hard disk is characterized by different read-write modes specially customized for video and data, which not only ensures the smoothness and reliability of video and the high integrity of data, but also effectively improves the time or quality of video recording. The enterprise hard disk is suitable for disk array, raid protection, data snapshot, NAS, or various storage devices requiring large capacity. Although both are optimized for long-time operation, enterprise level raid is more optimized, and the seek is faster than monitoring level hard disk. Therefore, the two kinds of hard disk can not be replaced. Fundamentally, the design requirements are different, just like using professional graphics card to replace household graphics card. Although both have video output, their functions and performance are much different.

Specific differences between PC hard disk and DVR special hard disk:

● service life of hard disk

Ordinary hard disks will start at full speed when powered on, and the instantaneous current may reach 2 A or even higher. The monitoring hard disk will accelerate slowly when starting, and the starting current will be controlled below 2 A. Because multiple hard disks are usually installed in the monitoring system, a large starting current will be generated at the moment of startup. If it is an ordinary hard disk, the power supply will be unbearable or even burned out. In addition, the monitoring system generally does not have high requirements for the transmission speed of the hard disk, but it will frequently read and write a small amount of data. Therefore, it is necessary to optimize the structure of the magnetic head reading and writing mechanism according to the reading and writing characteristics of the monitoring system in order to prolong the service life of the magnetic head. The theoretical mean trouble free running time of monitoring hard disk is much longer than that of ordinary hard disk, and the stability and reliability are higher.

● continuous working time difference

The design of ordinary PC hard disk is based on 8 × 5. eight × 5 means that the ordinary PC hard disk works 8 hours a day and 5 days a week (hard disk work means that the hard disk is in the read-write state. It should be noted that there are two states after the hard disk is powered on: working state and waiting state, in which the working state means that the hard disk is in the read-write state, and the waiting state means that the hard disk is not in the read-write state but in the standby state.) the DVR special hard disk is pressed 24 × 7 enterprise level environment requirements for design and development. twenty-four × 7 is to work 24 hours a day, 7 days a week (that is, work continuously). Therefore, ordinary PC hard disk is not suitable for long-time continuous reading and writing. If ordinary PC hard disk is required to read and write continuously for a long time, it will greatly damage the hard disk, resulting in various problems such as abnormal sound, reading and writing error, work suspension and so on, resulting in the final damage of the hard disk. Digital hard disk video recorder operates continuously all year round, so it is required that the hard disk must be able to work continuously for a long time. The special hard disk for DVR can meet this requirement.

● startup difference

All 3.5-inch hard disks contain motor systems. Therefore, when the hard disk is powered on and started, it is similar to the situation when the motor is powered on and started: that is, there will be a large starting current at the initial time of power on to complete the hard disk startup. If the external power supply system of the hard disk cannot guarantee sufficient current support during power on, the hard disk will fail to start, resulting in the unavailability of the hard disk. And if this happens many times, it is easy to cause damage to the hard disk. Since the power supply of the hard disk motor is met by the DC 12V of the external power supply system, the DC 12V current is taken as the standard when evaluating the starting current of the hard disk. The starting current of ordinary PC hard disk is generally between 2.8A and 3.2a. The maximum starting current of DVR dedicated hard disk is 2.0A. Digital hard disk video recorders often use multiple hard disks for data storage. Take the installation of 8 hard disks as an example: the starting current of ordinary PC hard disk is 2.8 × 8 = 22.4a, the lowest power consumption is 22.4a × 12V=268.8W。 The starting current of DVR special hard disk is 2.0A × 8 = 16a, the highest power consumption is 16A × 12V=192W。 It can be seen that with the same number of hard disks, DVR dedicated hard disks have lower requirements for external power supply system (with the support of external power supply with the same output power, more DVR dedicated hard disks can be installed). Note: in the case of the above example, if the power supply of the external power supply system can only guarantee 250W, when using ordinary PC hard disks, some hard disks can be identified, some hard disks can not be identified, and there is no regularity.

● operating power consumption and heat dissipation difference

Here, the operating power consumption refers to the power consumption of the hard disk in the normal read-write state. The operating power consumption of ordinary PC hard disk is generally about 14.5 watts, and that of DVR special hard disk is generally about 8 watts. It can be seen that the operating power consumption of DVR special hard disk is only 55% of that of ordinary PC hard disk. Low operating power consumption is not only of great significance to the power supply system, but also to the heat dissipation of digital hard disk video recorder system (about 75% of the operating power consumption will be converted into heat energy). In digital hard disk video recorder, if 8 hard disks are installed, the total power consumption of ordinary PC hard disk is 14.5w × 8 = 116w, the total power consumption of DVR special hard disk is 8W × 8=64W。 If ordinary PC hard disk is used, it can be imagined that there is such a high heat source in such a small space as digital hard disk video recorder, and the heat dissipation requirements of the system are very high. In order to ensure that the hard disk has a reasonable ambient temperature (0 60 ℃), effective heat dissipation must be carried out for the hard disk system. Using DVR special hard disk, the heating situation is much better - it reduces the heat dissipation requirements of the system and makes the system more adaptable to the environment.

● transmission difference

In addition to the transmission mode of traditional PC hard disk, DVR special hard disk also introduces an updated transmission mode - uninterrupted transmission mode, which is up to 65mb / s. By introducing the uninterrupted transmission mode, the support of hard disk streaming media is more reliable, and the fluency and stability of playback while digital hard disk video recorder is input are fully guaranteed. This is a feature that other hard drives do not have.

● price difference

Compared with ordinary PC hard disk, DVR hard disk is almost the same in price, but the support in special technology is different. The former pays more attention to performance, while the latter pays more attention to stable reading and writing. Only enterprise hard drives are relatively expensive. After all, they are more demanding.

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