My external drive won't copy using firewire

I'm trying to copy a large folder (90GB) from my internal drive to a Glyph 2 TB external drive using the Firewire port.  I get a variety of error messages and a failure.  When I use USB, copy is successful.  Any ideas why this is happening?
Thanks.  Jim

Having a failure copying large folders from one Glyph (500MB) to another (1TB) when they're directly connected with a FW800 cable.  When I plug the 1TB Glyph into the computer with USB, it seems to work OK.
Format for both Glyph drives is Mac OS Extended (journaled).

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