Time Capsule with ext HDD seems too slow for ethernet big file transfer

With new Snow Leopard on a Mac Mini, I have a wired Time Capsule with an external WD USB 2.0 HDD added. While moving files over 802.11N files seem to work fine, a full wired Ethernet connection seems to send the files too fast for the WD external drive to keep up. I get only the first 50Mb before the transfer gets corrupted. Isn't there a handshake that limits the file transmission to allow for the USB drive to stay ahead?
Has anyone else seen this? Is there a remedy?
Thanks
Bill H.

With new Snow Leopard on a Mac Mini, I have a wired Time Capsule with an external WD USB 2.0 HDD added. While moving files over 802.11N files seem to work fine, a full wired Ethernet connection seems to send the files too fast for the WD external drive to keep up. I get only the first 50Mb before the transfer gets corrupted. Isn't there a handshake that limits the file transmission to allow for the USB drive to stay ahead?
Has anyone else seen this? Is there a remedy?
Thanks
Bill H.

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