A7VT- can't boot with scsi drive if ATA 100 and IDE drive is attached... why?

[SIVEX]

I have an Asus A7VT socket A board with dip switches. I installed 3 drives:

1) SCSI Atlas 10K with Adaptec 29160N PCI SCSI controller.
2) IBM ATA100 45GIG as ATA100 Primary drive
Using onboard Promise controller

3) Western Digital 4gig 5200 RPM IDE drive on Primary IDE drive

I tried to boot off my scsi drive (atlas 10k) while having the ATA 100 and WD drive attatched. But fdisk would only allow me to set the active partition in drive 1 and not drive 2 or 3. I can only boot up from my scsi drive if I remove the other 2 drives leaving only the scsi drive installed, in order for it to be recognized as as drive 1. How can I have all three drives installed and have the scsi drive recognized as drive 1 so I can boot up from it? Your help would be appreciated

Thanks

 

[sleepdragon]

because you didn't change the boot sequence selection option in the bios...you have to change scsi/ata100 boot sequence to scsi first than ata100...

 

[SIVEX]

That works fine, only because I dont have my other 2 drives attached. When I attach the ATA 100 and IDE drive, my system won't boot up because the SCSI drive isn't recognized as drive 1 anymore. How can I assign drive numbers to them so the scsi drive will be drive one when all 3 are attached? When I originally set up the drives in FDISK, I couldnt set the active partition on the scsi drive because it wasnt recognized as drive 1, so I had to remove the other 2 to do that. That seems to be a connection with the whole problem. Thanks for your help. Send any suggestions you may have.