Common Options : A, C, SCSI/EXT
                            C, A, SCSI/EXT
                            C, CD-ROM, A
                            CD-ROM, C, A
                            D, A, SCSI/EXT (only when you have at least 2 IDE hard disks)
                            E, A, SCSI/EXT (only when you have at least 3 IDE hard disks)
                            F, A, SCSI (only when you have 4 IDE hard disks)
                            SCSI/EXT, A, C
                            SCSI/EXT, C, A
                            A, SCSI/EXT, C
                            LS/ZIP, C

Details

This feature enables you to set the sequence in which the BIOS will search for an operating system. To ensure the shortest booting time possible, select the hard disk that contains your operating system as the first choice. Normally, that would be drive C but if you are using a SCSI hard disk, then select SCSI.

Note : Some motherboards (i.e. ABIT BE6 and BP6) have an extra onboard IDE controller. The BIOS options in these motherboards replaces the SCSI option with an EXT option. This allows the computer to boot from an IDE hard disk on the 3rd or 4th IDE ports (courtesy of the extra onboard IDE controller) or from a SCSI hard disk. If you want to boot from an IDE hard disk running off the 1st or 2nd IDE ports, do not set the Boot Sequence to start with EXT. Note that this function has to work in conjunction with the Boot Sequence EXT Means function.