mounting

[Brian Henning]

Greetings:

Currently i have 2 drives ad1 (10 gig) and ad2 (10gig) on my bsd system that I would like to use for file storage. I want to create a mounting point, /files_area, that could treat the two drives as one.  So when I add files to /files_area it treats it like one big 20 gig drive.  is this possible? can someone point me to some docs on howto do it?

thanks,

Brian