[CentOS] CO 4.3 + SATA + udev removing /dev/sda

Hi,
I just installed CentOS 4.3 on a PATA drive and later installed 2 SATA2 
(300mbit/s)
disk drives.

The patched sata_via driver detect the drives and I can use them, but only
if I manually create the /dev/sda and /dev/sdb files using mknod.

My question is: why udev does not create /dev/sda at boot time?

Many thanks
Oliver

-- 
Oliver Schulze L.
<oliver at samera.com.py>