The hard disk is one of the most important devices in the monitoring system, and it carries the role of protecting data security. Traditional hard disks are not suitable for security monitoring because long working hours and poor working environments are a huge challenge for ordinary hard disks. Long-term, reliable, stable, low-power, low-noise professional hard drives will be more suitable for special requirements in the field of security monitoring.

I. Current situation and problems

       With the increasingly severe international continuous anti-terrorism environment and the new application of new technologies to promote monitoring, especially the improvement of corporate security requirements, monitoring has gradually entered people's daily lives. The security monitoring market is moving in the direction of networking and intelligence. This requires security products to enhance their own quality and reliability, application-oriented product segmentation, reduce the total cost, and achieve green environmental protection, to create a sales and service system to adapt to the security industry.

       The hard disk is one of the most important devices in the monitoring system, and it carries the role of protecting data security. Traditional hard disks are not suitable for security monitoring because long working hours and poor working environments are a huge challenge for ordinary hard disks. Long-term, reliable, stable, low-power, low-noise professional hard drives will be more suitable for special requirements in the field of security monitoring.

Second, hard disk storage technology introduced

1.Intelliseek - Intelligent Seek Technology

       Currently, hard drives have a unique intelligent seek technology that can actively calculate the optimal seek speed to reduce the rush of the drive, thereby reducing noise and energy consumption. With smart-steering technology, the operation of the actuator is effectively controlled, and the magnetic head can accurately access the next sector to read new information instead of the application of the hard disk storage technology in video surveillance to rush up and wait for the rotation of the hard disk. The fluency of the operation makes the seeking operation more quiet and the vibrations are greatly reduced. The security monitoring field is a field that requires high product power consumption and hard disk life. However, if the disk robot moves too fast, the power consumption of the hard disk will be too high, and the life of the robot arm will be affected, increasing the probability of failure.

2.RotaryAccelerationFeedForward(RAFF) - Spin Acceleration Forward Feedback

       This technology is widely used in SCSI products. By adding vibration sensors on the hard disk control PCB to detect hard disk vibration and compensate performance, this feature is particularly useful in the complex environment of multiple hard drives. When the hard disk is working, it will produce two kinds of vibrations, one is the horizontal direction, and the other is the vertical direction. The vertical direction vibration is very easy to understand. The danger of this kind of vibration is that it is easy for the head to collide with the disk. The vibration in the horizontal direction is because the disk will rotate at high speed when the hard disk is working. At the same time, it will generate centripetal force to drive the hard disk to move in the horizontal direction. Simultaneous horizontal movement of multiple hard disks may cause interference to other hard disks, that is, head off track The phenomenon, although the transmission system will let the head automatically return to the correct position, but it will have an unnecessary delay.

       Rotary vibration compensation is a technology designed for rotary vibration. The hard disk has a rotating vibration sensor. Once the surrounding hard disk rotates and rotates at the same time, the sensor generates a displacement signal, so that the head can be more quickly reset and the rotation vibration is reduced. The effect of head misalignment.

3. Ramp Load Technology

       Usually when the hard disk is in working condition, it not only generates horizontal vibration, but also generates vertical vibration. The vibration in the vertical direction is a great hazard to the hard disk. Once the vertical vibration of the hard disk occurs, it is easy to produce a hard disk failure. Conventional hard disks are provided with a textured hovering area only in the memory portion of the disk of the motor. When the hard disk is powered on, the slider carrying the magnetic head slides on the surface of the disk until the disk rotates at a speed of up to two. An air cushion sufficient to hold the skid between them is generated. At this time, the magnetic head gradually shifts to the sector where the data is stored to start normal operation. De-energizing of the hard disk can be regarded as the reverse running of the power supply. After the power is turned off, the magnetic head relies on the inertia of the motor and the head will move to this special hovering area until the inertia disappears and the hard disk completely stops working. The hard disk adopting RampLoad ramp loading technology can easily solve this problem. It improves the traditional design by transferring the head rest area inside the motor to the disk and establishing a separate area. This can avoid the impact of external force on the head ( Slider) Dropping from the hovering area to contact with the platter reduces the chance of the head (sled skid) coming into contact with the platter (the head is outside the platter when the hard disk is shut off and there is definitely no contact; if the hard disk is running, if it is In the idle (Idle) state, the head can also be returned to the stand instead of always flying over the platter. RampLoad ramp loading technology can also reduce the power consumption of the hard disk. When the magnetic head returns to the standby area, the power consumption must be lower than when the magnetic head is hovered on the surface of the disk. For the long-term standby security monitoring hard disk This technology is very necessary. In this way, the principle of buffering the slope is used to separate the head and the disk in the front and back rotation of the hard disk to reduce the friction and loss of the head and the disk surface, thereby making it more energy-efficient and the electronic components more optimized, thereby ensuring the long-term reliability of the hard disk. .

4. Liquid bearing motor

       The difference between a liquid bearing motor and a conventional ball-bearing spindle motor is that it uses an oil film instead of a conventional steel ball, that is, it does not have metal contact during rotation, and theoretically there will be no problem of wear. This allows the bearing to effectively absorb external vibrations and protect the bearing surface. Makes it able to withstand greater impact, longer life and less noise. This is a kind of hard disk anti-shock technology that can make the hard disk work noise and heat greatly reduced, even if installed in some thin and light notebooks with poor sound insulation also can not work noise.

Third, the advantages and characteristics of hard disk storage technology

       In recent years, with the development of security monitoring products and the special requirements of the market, hard disks have shown bright points that cannot be compared in the past. For example, the hard disk is particularly good in terms of noise reduction and noise reduction. The unique (IntelliSeek) intelligent seek technology is used to optimize the seek speed, and the operation of the actuator is controlled more effectively while reducing energy consumption, noise, and vibration. Accurately touching the next sector to read new information plays a crucial role. In terms of fluency in operation, the reduction in energy consumption of hard drives has been reduced by about 60% compared with the past, and the seek operation has become quieter and the vibration has been greatly reduced. Second, SilkStream technology is optimized for smooth, continuous digital video recording and playback, supporting up to 12 HD video streams, and liquid bearing motors to reduce noise and improve reliability. Advanced power management features ensure that electronic components provide first-class Low power consumption to meet the requirements of reducing power consumption and increase reliability. Ramp Load technology ensures that the heads are parked when the hard disk is started, stalled, and not working. In addition, multi-layer cast stainless steel housings and precision-designed bases minimize operating noise. At present, the tested hard disk has a noise level of less than 1 Sone (15 dB), and the human ear can hardly hear any sound. At present, the characteristics of hard disk products can be summarized as the following: such as reliability, low power consumption, low heat dissipation, and high shock resistance.

1. Long-term reliability

(1) Industry leading 1 million hour MTBF;

(2) Designed for continuous monitoring and video recording system with 24X7 high temperature (0-70 degree disk temperature);

(3) SilkStream technology supports streaming media commands, supports ATA7, uses CCT optimized for audio and video recording and playback, provides optimized audio and video data reading and writing for a long time, and improves the stability and reliability of audio and video reading and writing.

2. Low power consumption, low heat dissipation

(1) IntelliSeek function optimizes seek speed, reduces noise/power consumption/vibration;

(2) Ultra low starting current of 1.5 amps reduces the impact of power on the hard drive.

3. High vibration resistance

RampLoad ramp loading technology keeps the heads from contacting the disk for a long time, greatly improving the non-working shock resistance of the disk and improving the reliability of long-term operation.

4. Streaming media optimization

       Streaming media has continuity, realtime, and timing. It is the most suitable carrier for saving security monitoring and recording video. SilkStream is a feature of AV series hard disk developed specifically for streaming media. It is optimized for smooth continuous digital video playback. It supports up to 12 simultaneous high-definition digital video streams. SilkStream-compatible ATA stream control command set can be used by users. Provides standard flow management and error recovery features. This technology can solve the debris-related quality of service issues, so performance will not decrease over time, and improve the reliability of the hard disk, reduce the on-site DVR system failure and can reduce the hard disk task load.

Fourth, the application of hard disk storage technology

       At present, hard disk capacity is suitable for audio video applications such as digital video recorders and surveillance video systems, including digital video recorders, IP gateways, and mainstream surveillance systems. It often requires hard disks capable of 24 x 7 continuous operation, and has stricter requirements than personal computers. For example, higher reliability and compatibility, lower power consumption, simultaneous recording of multiple audio or high-definition video streams, etc. In consumer applications, digital video recorders must deal with harsh environments and usage profiles, which means that the hard drives they house consume less energy, produce less heat, and run quietly, making them more suitable for market applications.

      Tested and verified, the starting current of the standard hard disk only needs 2.8A, and the 12V starting energy consumption is only about 35W, which will not cause too much burden on the power supply. However, for the DVR, this multi-disk environment, the starting current of 2.8A appears to be If it is relatively high, if a monitoring system using eight hard disks is assembled, the power consumption of 12V is close to 270W. If a hard disk with a lower starting current is used, the responsibility of the power supply will be reduced. The current startup current of the new hard disk is only 1.8A, so that the 12V power consumption is up to about 200W, the power requirement is reduced by nearly 100W, and the overall cost of the DVR can be reduced; and the operation is quiet, the temperature is low, and the reliability is high And data transfer speed characteristics, as well as SilkStream, IntelliSeek, IntelliPark and IntelliPower and other technologies, ideal for a variety of audio and video applications, such as PVR, DVR, set-top boxes (STB) and video surveillance records. At the same time, green environmental protection has also become an important direction for the development of hard disk technology. Currently, a variety of green energy-saving technologies have been applied, such as: IntelliPower - designed to take into account significant energy savings and stable operating performance, capable of converting at operating speeds and transmission rates. There is a good balance between speed and cache capacity. In addition, the GreenPower hard drive consumes less power at start-up, which reduces the system's peak load pressure; ntelliSeekTM - calculates the optimal seek speed to reduce energy loss, noise, and vibration during operation, making full use of the motor swing wait Time reduces seek speed, and reduces noise/power/vibration; IntelliPark—by reducing the aerodynamic drag by automatically unloading the head when idle, suspending the operation of the read/write channel electronics, thereby reducing energy consumption. In addition to applications such as IntelliPower, IntelliSeek and IntelliPark, which ensure quietness, a multi-stage stainless steel top cover and precision-designed basic accessories are used to minimize the sound of hard disk operation and cater to consumer applications. This feature has important implications for the application development of hard disk storage technology in the field of audio and video surveillance and the promotion of green and energy-saving storage.