Well, after being working with computers for 25 years you never get amazed enough with things that happens. I tried and tried to get FCP work with my Seagate SATA II discs on two LaCie enclosures and never could work it out, the sil 3132 Express/34 Sata Link controller seemed to be not compatible with Mac and TCP. Just when I am leaving to Miami to pick up several items, among with is the Sonnet Exp Card, all of a sudden, while switching to Vegas in Win and FCP in Mac I forgot to take the card off when going to Mac. My surplise is that at the top of the bar it appeared the card and FCP recognized the discs, in mirror, as the scratch disc and it is working fine.
The only logical explanation is that the OS found the suitable drivers in the internet and it installed it by itself or the OS made and upgrade by intelf (within a package of software upgrades) and now the drivers are working.