WD hard drives jumper settings and SATA 1.5 Gbps limit

Hard disk jumpers where a necessary nuisance in the IDE/(P-)ATA days. Jumpers made the difference between a functional and a non-functional hard drive.
Fortunately, they disappear in the S-ATA age. Well, almost… While totally unnecessary nowadays, jumpers are still needed to fiddle modern S-ATA drives to make them compatible with some early SATA implementations motherboards.