This is just as a General frame of reference.
Common Consumer Ethernet, on fast optimized Windows based systems:
Plain Vanilla 100Mb/sec. In the real world
70 to 80Mb/sec.(b=bits 8bits=1Byte)
Wireless* 802.11b = 11Mb/sec. In the real world
Usually 4-6Mb/sec.
Wireless* 802.11g = 54Mb/sec. In the real world
Usually 18-22Mb/sec.
Wireless* 802.11gsUPER = 108Mb/sec. In the real world
Usually 30-38Mb/sec.
*Wireless Ethernet needs additional protocol over head for the transfer. In addition, it is not as stable as Wired so it needs extra processing procedures.
A current popular Hard Drive:
Maxtor DiamondMax Plus 9 (160 GB, ATA-133) . Yields 60MB/sec. (480 Mb/sec.).
I.e. About x7 faster than 100Mb/sec. Ethernet.
A popular SCSI Seagate Cheetah 15K.3 (73 GB Ultra320 SCSI) 76MB/sec.
More about EIDE, SCSI etc. here:
http://www.storagereview.com