How to create multi volume partition

Hi
I'm trying to figure out how I can create one single partition accross multiple disks so that I basically can extend the partition at the moment I'm running out of diskspace.  The disks that I use are western digital mybook daisychained via firewire 800.
I tried to find option in diskutil but couldn't find it, possible that this might be doable on the command line but I'm too unfamiliar with it.
Any suggestions are highly appreciated.
Thanks in advance,
Frans van Wessel

Matt Clifton wrote:
The only way to do what you want with Mac Extended format is to use RAID to stripe a volume across multiple disks. However, it is not dynamic in that you cannot add space later in the way you describe.
I feel I must add that in addition to missing "dynamics" and a few other disadvantages, RAID 0 is highly dangerous due to zero fault tolerance. If only one of the partitions/drives goes bad, none of the data on all of the partitions can be accessed anymore!
fvwessel, you better locate large portions of your data, such as videos, music, photos, onto separate, individual and independent drives. It'll make it safer, and typically all apps are supporting it.

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