N
An wired connection is always faster than a wireless connection.
The fastest way to transfer files from your computer to an external hard drive would be with a firewire cable. They are much faster than USB cables.
Ethernet is the fastest that I am aware of. The ethernet cable is made for speed reliability and its main purpose is to transfer data at high speeds. Usb cable is for transfering other things like pictures from your digital camera or to print something off of your printer.
Wired is always the fastest, but for wireless, 802.11N is the fastest.
Wireless-N is currently the fastest technology at600 Mbit/s.
Serial port is by far the fastest port. It is so fast that it is used in modern computer to connect hard drive to motherboard. Current generation of serial port is SATA 6Gpbs.
USB
High Speed HDMI Cable with Ethernet is the fastest at the moment (HDMI 1.4)
There are many wireless routers. More now than in 2010 even. The fastest wireless router in the year 2010 was the Linksys WRT310N WirelessN Gigabit router.
The Linksys E2000 is said to be the fastest wireless router available. It is estimated to cost $165 and can be purchased online.
Currently, China has the fastest computer