usb disk detected before scsi controller

[Jerome Tournier]

Hi all,
i have a problem with my kickstart installation: i am installing my linux
with an external usb disk. The problem is that the usb disk is detected as
/dev/sda and the scsi disk as /dev/sdb and /dev/sdc.
Is there a way to specify anaconda (via ks) to first load the ips module
for scsi disk and then the usb one ?
Thanks for any help !
-- 
Jerome