Do all SATA devices-- like hard drives, disc drives, need an extra SATA power connector, or can they draw power from the SATA cable, so there is no need for an extra cable?
All SATA devices need power connections. The SATA cable brings no or little power to power the device. You need power from the power supply. If your SATA device doesn't need additional power then it wouldn't have come with the power connector port.
