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S.M.A.R.T technology concept
Self-monitoring, analysis and reporting technology (S.M.A.R.T) is widely used to disks to protect data security. When disks are working, the monitoring system analyzes the states of motors, circuits, disks, and heads. When an exception occurs, an alarm will be generated and automatic speed-down and data backup may be implemented.

Coherent detection technology
The coherent detection technology uses a local oscillator (LO) laser that has the same frequency as the received signal and implements interference between the LO laser signal and the received signal to restore the amplitude, phase, and polarization status information from the received signal. In addition, the technology uses high-speed analog-to-digital converter (ADC) and digital signal processing (DSP) techniques to compensate for CD and PMD on the line. The coherent detection technology improves the CD, PMD, and OSNR tolerance, and system transmission capability, achieving transmission performance equivalent to a 10G network. By using the coherent detection technology, a 40G/100G coherent system does not have to use a fixed dispersion compensation module (DCM) or a tunable DCM (TDCM), which is intended for fine tune the dispersion of a single wavelength in a traditional 40G system. A 40G/100G coherent system requires fewer optical amplifiers, does not require accurate measurement of the fiber length and dispersion, reduces system configuration costs and labor, and improves fiber transmission network performance.

Disk NCQ technology
Native command queuing (NCQ) is an extension of the SATA II protocol allowing disks to internally optimize the order in which read and write commands are executed. Disks that support NCQ can put a maximum of 32 commands in a queue, adjust the command execution order, and enable immediate command execution. As a result, disk performance is improved and CPU usage is reduced.

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