Power Consumption and Temperature
We measure the power consumption of our HDDs on a special testbed that can connect to the 5V and 12V rails. So, the results reflect the requirements of the HDDs under different usage scenarios without counting in the power draw of the NAS’s hardware platform. The random/sequential read and write loads are created with the IOMeter software. When analyzing the results, do not forget that the HDDs differ in storage capacity.
The Seagate NAS series is 15% and more economical in idle mode and at random reading. It is also better by 6% at random writing. But when it comes to sequential operations, which require fewer movements of the read/write heads, the new series needs 10% more power than their opponents. This is still a good result considering the twice larger storage capacity. The peak power draw is less than 5.5 watts, so the power supplies and cooling systems of modern NASes should easily cope with the new HDDs. As for the startup current, the Seagate NAS is better than the WD Red as the last diagram shows.
Most NASes regulate the speed of their cooling fan automatically, so it would be incorrect to compare the HDDs here. Anyway, their temperature was no higher than 43°C in RAID5 during our tests. The system sensor reported 55°C and the processor was as hot as 75°C. So, the new models are okay in this respect.