A liquid crystal display device and a driving method thereof are disclosed in the present invention. In an aspect, a method is provided that includes determining whether a symbol to be transmitted is an active symbol, wherein the symbol comprises a plurality of subcarriers, and encoding identification information on a first portion of subcarriers if it is determined that the symbol is the active symbol. By using the data and log areas thus protected, the stand-by computer system may take over valid data and log areas to perform a failover. The storage object then sends the data object to the data access objects. A second sidewall extension is integrally connected to and extends orthogonally with respect to the second sidewall.