Not getting full Gigabit Ethernet Speed on iMac Core Duo

I am using Airport to connect to a Linksys Wireless Access Point connected to my DSL modem. I am using ethernet to connect to a 3Com OfficeConnect 8-port Gigabit switch. I have 2x 500 GB LaCie Ethernet Disk Mini's (with Gigabit interface) connected to the switch.
The lights on the switch tell me that the drives and iMac are connected at full speed, however I can transfer a 650MB .dmg file to a firewire 400 drive in 1/4 of the time it takes to transfer the same file to one of the gigabit ethernet drives.
running ifocnfig en0 returns:
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::216:cbff:fe94:747b%en0 prefixlen 64 scopeid 0x4
inet 192.168.0.1 netmask 0xffffff00 broadcast 192.168.0.255
ether 00:16:cb:94:74:7b
media: autoselect (1000baseT <full-duplex,flow-control>) status: active
supported media: autoselect 10baseT/UTP <half-duplex> 10baseT/UTP <full-duplex> 10baseT/UTP <full-duplex,hw-loopback> 10baseT/UTP <full-duplex,flow-control> 100baseTX <half-duplex> 100baseTX <full-duplex> 100baseTX <full-duplex,hw-loopback> 100baseTX <full-duplex,flow-control> 1000baseT <full-duplex> 1000baseT <full-duplex,hw-loopback> 1000baseT <full-duplex,flow-control> none
I have no idea what that all means, but i do know that I am not getting gigabit ethernet speed.
Can anyone help?
Thanks

If you are transferring data via wireless then you cannot approach Gigabit Ethernet speed. 802.11g has a maximum transfer speed of 54 Mbps while 802.11n is about 130 Mbps. This is much slower than a FW400 port. Your router and switch must both be Gigabit capable and your drive must be connected to Ethernet to even hope to achieve Gigabit speeds - no wireless.

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