Why am I getting such slow transfer rate over wired LAN?

"Linksys WRT400N does NOT have Gigabit LAN support.

That is your bottleneck."

"It really depends on the adapters used within the computers, I work with many different sorts and find anything from 7-12MB/s normal on a 100Mb network. (remember, 8 Megabyes a second is 64 megabits a second)

As others have said, your router is not gigabit compatible, so it will most likely be falling back to a standard 100Mb speed.

If I was you, I would test copying to another machine and then bypassing the current one and copying directly from the other two just to test out your network and see what one has the slower card.

Apart from that, I typically find, if I need to do a really big transfer urgently (>100GB) I usually just rip out the hard drive and put it in a spare dock or internal connection and copy it as it can turn a job from a few hours in to a few minutes."