Hi Winfred,
I think the raid controller bios & driver are hiding the drive. You can disable the raid configuration in the main BIOS. Go to the Main bios (press F2 or DEL) and there should be a place where you can configure the IDE controllers
SATA controller has three modes of operation
1. IDE mode - no AHCI, no RAID
2. SATA mode (sometimes called AHCI mode) - AHCI enabled, no RAID
3. RAID mode - AHCI enabled, RAID enabled
I think yours is in (3) Raid mode. Ideal place is to put it in (2) SATA mode / AHCI mode. Try (1) only if (2) does not work
Let me know what happens.
Hope this helps
Arun
530i / Nikasil M60 3 Ltr Motor / ZF5HP18 (A5S 310Z) Tranny / Prod: March 95 / Fully stock / 95K miles