ext3 is the exact same thing as ext2 only with journaling...
ext3 is usually not your best option for dns-321 unless you are running an os off of it or actual sensitive very very very important data.... as for music/media - ext2 is better because is a little faster....
if you are ****e to power interruptions and have no ups - then try the ext3 format - although you'll be slowed down a bit...
ext3 journaling feature basically creates a journal file - in case of power loss or hotswapping or disconnection during transfer, it'll keep from corrupting your files.... ext2 will basically say "that's it, let's start over" ext3 will say "let's keep going"
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