The difference between security dedicated hard disk and ordinary hard disk

Working time difference

The design of ordinary PC hard disks is based on working days; it means that ordinary PC hard disks work 8 hours a day and 5 days a week. Two states: working state and waiting state. The working state is that the hard disk is reading and writing, and the waiting state is that the hard disk is not reading and writing but is in the standby state.)

The dedicated hard disk is designed and developed in accordance with the requirements of the 7×24 enterprise-level environment. 7×24 means working 24 hours a day, 7 days a week (that is, working continuously). Ordinary PC hard disks are not suitable for long-term continuous reading and writing. Long-term continuous reading and writing of ordinary PC hard disks will cause abnormal sounds, reading and writing errors, work suspension and other problems, which will cause data loss.

Digital hard disk video recorders require uninterrupted operation all year round. Therefore, the hard disk that stores video data must first be able to work continuously for a long time. The special hard disk can meet this requirement.

Power management

All 3.5-inch hard disks contain two motor systems (spindle motor and magnetic arm motor), so when the hard disk is powered on, it is similar to the situation when the motor is powered on: that is, there will be a larger start at the initial time of power on. Current to complete the hard drive boot. If the external power supply system of the hard disk cannot guarantee sufficient current support when the power is turned on, the hard disk will fail to start, causing the hard disk to be unusable. 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 satisfied by the DC 12V of the external power supply system, the DC 12V current is used as the standard when evaluating the startup current of the hard disk. The startup current of ordinary PC hard disks is generally between 2.8A and 3.2A. The startup current of the dedicated hard disk is up to 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 startup current of ordinary PC hard disks is 2.8×8=22.4A, and the lowest power consumption is 22.4A×12V=268.8W. The startup current of the dedicated hard disk is 2.0A×8=16A, and the highest power consumption is 16A×12V=192W. It can be seen that with the same number of hard drives, dedicated hard drives have lower requirements on the external power supply system (with the support of external power supplies with the same output power, the number of dedicated hard drives that can be installed will be more).

Operating power consumption and heat dissipation difference

The operating power consumption here refers to the power consumption of the hard disk in the normal read and write state.

The operating power consumption of an ordinary PC hard disk is generally about 14.5 watts, and the operating power consumption of a dedicated hard disk is generally about 8 watts. It can be seen that the operating power consumption of a dedicated hard disk is only 55% of the power consumption of an ordinary PC hard disk. The low operating power consumption is not only important for the power supply system, but also for the heat dissipation of the digital hard disk video recorder system (in operating power consumption). About 75% will be converted into heat).

In the digital hard disk video recorder, if 8 hard disks are installed, the total operating power consumption of ordinary PC hard disks is 14.5W×8=116W, and the total operating power consumption of dedicated hard disks is 8W×8=64W. If an ordinary PC hard disk is used, it can be imagined that there is such a high heat source in such a small space of a digital hard disk video recorder, and the heat dissipation requirement of the system is very high. In order to ensure that the hard disk has a reasonable ambient temperature (0～60℃), The hard disk system must be effectively dissipated. With a dedicated hard disk, the heat generation is much better-the system's heat dissipation requirements are reduced and the system is more adaptable to the environment.

Transmission difference

In addition to the transmission mode of traditional PC hard disks, the dedicated hard disk also introduces an updated transmission mode-the uninterrupted transmission mode, the maximum transmission mode is 65MB/S. By introducing an uninterrupted transmission mode, the hard disk's support for streaming media is more reliable, and the smoothness and stability of the digital hard disk video recorder's playback while recording is fully guaranteed, which is a feature that other ordinary hard disks do not have.