Hi again!
The RPS is WD's optimized spin up feature. 2.5-inch drives are configured to spin up using minimal power consumption. This is triggered (when the certain jumper settings are made) during spin up and not through the whole operating process of the HDD. The specific focus was to minimize the duration and magnitude of the peak power consumption from the hard drive and it would perhaps slightly help with high temperature problems. This is only necessary, though, when the power supply may not be able to support the spike in power consumption during boot up.
CK_WD
