Adaptec 29160LP card BIOS show Fujitsu disk MAT3073NP 73GB have 17GB size

Hi,
I have buyed a Fujitsu disc model MAT3073NP 73GB size. I have mounted it on controller Adaptec 29160LP, on which they are mounted two disks IBM 36GB size.
The controller is on Pci slot of netfinity 3500 Type 6844-30x.
At BOOT time, the controller finds all discs with protocol ?U160?, but entering in SCSISelect the Fujitsu disc it comes seen of ?only? 17GB. Such dimension is brought back also from the operating system (W2k serveur).
I have updated the BIOS of controller to last available (3.10.0), but it is not changed nothing.
Someone could help me?