Eh bien ayez...
Je suis content. J'ai trouvé.
En fait, il faut installer Xp avec une disquette contenant les pilotes SATA contenu sur le CD rom de la carte mère (répertoire SATA). Moi par défaut j'ai tout mis enfin ceux contenant le nom "SiI 3112 controller" comme cité dans le fichier read me :
1) Windows NT 4.0 and Windows 2000/XP Fresh Installation
--------------------------------------------------------
Follow the instructions in this section if you are performing a new
installation of Windows NT 4.0 or Windows 2000/XP, and you wish to
boot from a device attached to the SiI 3112 controller.
1. Power off the system. Connect the hard drives to the SiI 3112
controller and insert the controller into a PCI slot. Power up
the system.
2. Put your Windows NT/2000/XP CD into the CD-ROM/DVD drive, or
the NT/2000/XP boot diskette #1 in the floppy drive if your
system cannot boot from the CD.
3. Press F6 for third party SCSI or driver installation at the beginning
of text mode installation. Press 's' when setup asks if you want to
specify an additional device, and insert the diskette labeled
'Silicon Image SiI 3112 SATARaid Driver Installation Disk' .
Press 'Enter' and select
'Silicon Image SiI 3112 SATARaid Controller'
4. Press 'Enter' to continue on with text mode setup.
5. Follow the setup instructions to select your choice for
partition and file system.
6. After setup examines your disks, it will copy files to
Windows 2000 installation folders and restart the system.
The setup program will continue and finish the installation
after restart.
7. Wait until Windows 2000 finishes installing devices, regional
settings, networking settings, components, and final set of
tasks, reboot the system if it is required.
8. See instructions in section 4 to verify controller was installed
correctly.
Et voila. Il a fallu que ce soit un vendeur de chez Leclerc qui me donnes la réponse car ils ont les mêmes soucis avec lesDD SATA sur leur nouvel bécane après formatage. Comme quoi ils y a pas que des ignares...