eastlakeThere is even a 5-port Gigabit Ethernet switch that is powered from a USB port.

www.dual-comm.com/Gigabit-5-Port-LAN-Switch.htm

Wile EThen your network is not 100Mb. The max throughput for 100Mb is 12.5MB/s. Remember, it's rated in bits, with a small b. There are 8 bits in a Byte (the upper-case B). Divide 100Mb by 8, and you get 12.5MB/s.

Mussels' numbers are spot on for theoretical maxes, except, the overheads involved in networking, don't even allow you to achieve maximum throughput on the network, so the real world numbers are actually lower.

I have a true Gb network, and I only usually get around 90MB/s throughtput, on the fastest sections of 2 RAID 0 arrays.