How to add second HDD to boot sequence

Hi,

Can anyone tell me how to add the second HDD (D:) to the boot sequence? I would like to be able to place it before the first drive (C:) in the boot sequence, but at the moment it is not even in the list.

Details:

Dell Dimension 8300, BIOS A05, Windows XP

From the BIOS Setup menu (F2 on startup):

Drive Config says:

SATA Primary - Hard Drive

SATA Secondary - Hard Drive

Primary Master - OFF

Primary Slave - OFF

Secondary Master - OFF

Secondary Slave - OFF

IDE Drive UDMA - ON

Under Hard-disk Drives the list shows:

1. Unknown (not installed)
2. System BIOS boot devices
3. USB device (not installed)

and Boot Sequence:

1. Diskette
2. IDE CD-ROM
3. Hard-Disk Drive C:

I have tried the up/down arrows in the lists but no other entries are shown. There are definitely two physical hard drives. If I go straigtht to the boot menu on startup (F12) the second SATA drive appears in the list. But I would like to make the change permanent.

I have searched extensively, but not found an answer to this specific problem. Thanks for any help/links/instructions!