As the article states:
Fortunately, you can find drivers and utilities that allow you to use a 3TB drive as auxiliary storage with any flavor of Windows, XP or later. I say “auxiliary” because you can boot Windows from a 3TB drive only if it’s 64-bit Vista or 64-bit Windows 7–and then, only if you have a PC with an EFI/UEFI BIOS. EFI is Intel’s Extensible Firmware Interface, and UEFI (United EFI) is the nonproprietary version based on the 1.10 EFI spec.
If you don’t have the correct drivers for it to see the drive, then even if the bios sees it as a 3TB drive, the OS will not. And the reason that you have different results on SATA2 & SATA3 is most likely because they require different drivers. For example, I’m building a system right now and the mobo that I’m using requires seperate drivers for the SATA2 & SATA3 as well as USB 2.0 & USB 3.0.
