I have some motherboards designed for 4-6 SATA ports, but only 2 SATA connectors were installed, and I'd like to add the missing connectors plus any needed termination resistors. Here's an example with an ECS GeForce 6100SM-M v. 1.0 motherboard:
What are the values of the missing resistors? I thought that each pair of SATA data lines needed one 100 ohm resistor between them, but on this circuit board the resistors seem to be arranged differently.