What are "Bootable add-in cards"?

[PARRISH]

Can anyone tell what are "Bootable add-in cards"? When I go into the BIOS option then this thing will appear under the [Advanced BIOS Features] [Hard disk boot priority]:

"Bootable add-in cards" is an item on the HDD boot priority list. The complete list is (booting off number 1):
1 SCSI-2: 7Li_RAID
2 SCSI-1: ST3250823AS
3 SCSI-0: ST3250823AS
4 Bootable add-in cards

I only have a graphics card and a 2 port Sata interface card and this card has 2 non raid hard drives connected to it. And this both drives are already showing up in the hdd priority order list. Also, those 2 drives are not bootable since they contain only extended partitions. So, can anyone tell me what is the "Bootable add-in cards"? Thanks for any information

[anshusehgal]

I will tell you what my computer does when I move up to first in boot order, and then enable my scsi card's bios to boot from CDrom and then insert a bootable CD in that CDRom. It will then boot from it and then ignore all else because it never gets to any other media for booting.

[Pugsly]

Even I have got a Sata card that is bootable and it has its own bios as well and my system boots from this only.