That seems to be running much too slowly, unless you have a very, very, very large file on the drive. It's possible that daisy chaining FW800 isn't working well (FW800 is much pickier than FW400) - assuming that the drives don't seem like they're active, and activity monitor isn't showing a lot of disk I/O, I'd stop it and try not daisy chaining the drives...
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--Dave Nanian
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