5.1 Works but 4.x fails .. :s

[Wout A.]

Hi,
I'm trying to install FreeBSD 4.9-RC4 on a amd k6/2 333mhz with a seagate 10gb hdd
and 64M ram.
When I partition my hdd and it 'should' start formatting the disk, I get these errors:

"Unable to swap to /dev/ad0s1b: invalid arg"
"Unable to make new root fs on /dev/ad0s1a!"
"Couldn't make fs properly. Aborting"

while i get this in my debug screen :

ad0 coudln't find label (disk label corrupted)
ad0s1 coudln't find label (disk label corrupted)
DEBUG Scanning disk ad0 for root fs / swap partitions
can't open /dev/ad0s1a: invalid arguments

I get the same with FreeBSD 4.6-R and 4.8-R, but in OpenBSD 3.3 and FreeBSD 5.1 it
works flawless... I don't understand, isn't there a way for me to install FreeBSD 4.x ???

Thanks
Greetings, Wouter