|Why in the world would you buy a SATA III hard drive to install to a SATA I controller? That is just asking for problems. The green series are not really good drives for the boot/OS drive either because they run at 5400 RPM.|
I suggest you return the drive and get a SATA II version that has the throttling jumpers. Or you might be able to install a SATA III controller card. Seems like a big waste of cash on an older system. That drive came with a premium price tag didn't it?
Going back to what you posted about, Western Digital is the only source to solve your problem, if it can be solved at all.
I suspect you misread the instructions. I would think they applied to throttling from SATA III to SATA II.
I also think there is an issue with the 3TB capacity and WinXP. In order to get those capacities sector sizes had to be increased. You evidently know about this because you mentioned alignment.
However, you may not know that you will take a performance hit, if you even get it working. Look at the article in the link below.