increase copy/paste speed

also, the harddrive is 15000rpm ultra 320 scsi, data transfer rate 320mbps

Try setting the properties of both the NIC cards and the switched port from auto-detect to 1000mbps full duplex. Hope this helps.

both nic and switch is set to 1000 full/duplex

I don't know the topography of your network, but these probably aren't the only machines on the network. Just because 2 machines on a network connect at 100mb doesn't mean that you get this throughput. Verify your TCP/IP config as the settings for the gateway, wins, dns can have an effect on through put. Rancoon speed test is a good tool for checking through put of machines on a network. Other factors that impact throughput will be do you have an managed or unmanaged switch if managed is it config correctly. Also the switches utilization % will impact performance

It is the write speed of your drive and the performance of your software (2k). Even if you had fiber you would get the same speed. Your OS acknowledges the data in the middle layers of the OSI as it comes in.

Don't do as one guy said and change the speed of your NIC cards. Leave them at auto. If you change to anything else you will probably introduce all kinds of flaky connection problems (e.g large files will not copy) - this is a known issue with switches.
If the speed of the file transfer has not increased with the network upgrade then the bottleneck is not with the network. It may already be running at peak, as it sounds like all your hardware and connections are tip top.

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