Trouble installing 6.1 on an old machine

[Andreas Widerøe Andersen]

I have an OLD machine (from 1996) that's been running FreeBSD for about 8
years now steady and reliable. It has gone through several versions and was
running 4.11 untill today when I decided to make a fresh 6.1 install.

When booting from the installation CD the only way I can make it skip a lot
of harddrive errors is when I boot in safe mode. I did this and installed
the system. However, the same problems are there when I reboot from
harddrive after the install (not in safe mode).

Here are a few of the error messages I get:

ad0: Failure READ_DMA timed out LBA=0
ad1: Failure READ_DMA timed out LBA=13281487
ad1: Timeout READ_DMA retrying (1 retry left) LBA=0
and so on...

It ends with a mountroot> prompt.

Any ideas what I can try?

Thanks,
Andreas