Slow large file transfer speed with LaCie 1T firewire 800 drives

I am transferring two large files (201gb and 95gb) from one LaCie 1T firewire external drives to another one (using separate connections to a PCI Express firewire 800 card in my Quad G5. The transfer time is incredibly slow – over for hours for the 201gb file and over 2 hours for the 95gb file.
Does anyone have any ideas why this is so slow or what I might try to speed up the transfer rates?
Thank you.
G5 Quad 2.5 8GB DDR2 SDRAM two SATA 400GB   Mac OS X (10.4.5)  

You posted this in the Powerbook discussion forum. You may want to post it in the Power Mac G5 area, located at http://discussions.apple.com/category.jspa?categoryID=108

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