This is a type of IDE controller that is used to control various
devices at high speed. The first Ultra ATA specification was
Ultra33. Then Ultra 66 was released and finally Ultra ATA/100
is the current specification.
USB
The USB bus transfers
data at a very fast 12Mbps (12 million data bits per second).
It is expected to replace the serial and parallel ports as
the preferred method of connecting devices to the computer.
