Is it possible to format an external USB drive with XFS or EXT3 ?

Greetings all.
I am running a 2,8Ghz 8x core with 6Gb ram. I have a NAS, (Buffalo Pro Duo Linkstation) which has a built in linux which saves data using XFS (I think). It has a built in backup routine, but the drive it backs up to MUST be in XFS or EXT3 (Fat 32 works but it drops all files over 2GB ;( ... ) So - here's my question:
How can I format the external USB drive (A seagate freeagent) in XFS or EXT3 so that it can run on my Buffalo? My preference is to use a GUI mac program (does one exist?) or to use a command line UNIX command (FSK? - but then, how????). I could also use (GASP!) a windows utility on parallels, or even install a linux distro via parallels. But it should be easy I hope...
Looking forward to any ideas/thoughts, tips, etc.
thanks and best to all from Berlin,
Jason

Download a "Live CD" (one you can boot of into running copy of Linux without having to install anything; for example, [OpenSUSE Live CD|http://download.opensuse.org/distribution/11.0/iso/cd/openSUSE-11.0-GNOME-Li veCD-x86_64.iso]).
Use OS X' Disk Utility to burn it to a CD.
Insert the CD you just burned (if it ejected afterwards), and then restart your Mac.
Hold down the 'C' key on the keyboard as the Mac boots, and it should switch to booting off the CD. Once the CD starts loading, you can let go. It will take a couple of minutes, but it will eventually boot into Linux.
Attach your USB drive.
Run gparted (you need to search the menus for it, it's under system administration, I think -- or you can open up a terminal window and simply type 'gparted').
Find your disk (/dev/sdb or /dev/sda) and partition and format it using the filesystem you want.
When done, restart the computer. You'll boot back into Mac OS X and have an EXT2/EXT3/XFS formatted external drive (that OS X won't recognize, by the way).

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