Embodiments of the invention provide a magnetic disk drive having increased efficiency of generation of power for its internal low-voltage blocks. In one embodiment, the integrated circuit contains at least two physical layer modules, a media independent interface and a media access control module. The solution helps the multi-carrier system to handle multi-path channel with large delay spread, to obtain more accurate channel estimation and to achieve better receiving performance. The present invention also includes new Data Socket URLs which allow the user to access IO sources. The compound for molecular electronic device has the structure of following Formula 1,n\u2003\u2003<Formula 1>wherein, R is a single molecule having an electrical conductivity, M is independently a repeating unit constituting a polymer having an electrical conductivity, and n is independently an integer ranging from 100 to 500.