M6500 Second hard drive not detected

Hi,

I try to add a second hard drive into my M6500 Precision Mobile Workstation.  I've put the new hard drive into the second bay, but the system didn't detect it.  In the BIOS, it's marked as "None".  I test the drive by inverting the first and the second hard drive, but it always only show the first bay (so the new drive is OK and detect in the first bay).

I installed the little adapter on the hard disk (so it's plugged correctly).

Do I miss somethings ?  Is there a BIOS setting or a SATA Controller setup that I didn't view ?

Thanks a lot!