Almost all the power connectors used inside a desktop PC have at least two voltages. For example, a hard drive will usually draw from only the 5V and 12V pins, but some SSDs are designed to use 3.3V.
The problem with these connectors is that they usually aren't designed for many plug/unplug cycles. The SATA power connector is also nearly unique in being designed for hotplugging by ensuring that the ground pins make contact first and disconnect last.
The problem with these connectors is that they usually aren't designed for many plug/unplug cycles. The SATA power connector is also nearly unique in being designed for hotplugging by ensuring that the ground pins make contact first and disconnect last.