Invalid partition

[Fabio Bucci]

Hi,
this is the first time i install FreeBSD. 
I'm a newbie.
:-)

I've 2 HD, the first with 8GB and other with 40GB.
I boot FreeBSD with CD installer and i created a slice on each HD.

On the first disk i created the following partitions:
- /var
- /
- /usr
- swap

While on the second disk i created only one partition called mounted as /disk1

When installation finished, i reboot my pc and return this error:

Invalid partition
Invalid partition
No /boot/loader

Where did i mistake?????

Thanks to all!!!