Introduction - If you have any usage issues, please Google them yourself
Serial describe is a lane, and the parallel port is the eight lane 8 can be conveyed at the same time (one byte) data.
But the parallel port is not fast, as between the 8-channel interfere with each other. Transmission speed is limited. And when the transfer goes wrong, at the same time re-Chuan eight bits of data. Serial no interference, transmission error, a re-issued after it. Therefore, faster than the parallel port. Serial hard disk is being seriously.