Disc Operating Noise
Our results are Decibel values dB(A). Mathematically speaking, a 10dB difference on power measurements is a 10X (1000%) increase in actual power. Hower, the human ear does perceive a 10X increase in audio power to be only twice as loud.
The Seagate and Fujitsu drives are quite hot models! Here, Western Digital did very good work once again, as the 15 GByte drive is still less than 40 degrees.