HGST, a unit of Western Digital, intends to construct two big, new buildings in south San Jose in an expansion of its campus that could create up to 1,700 jobs and help develop a transit and technology village for the area, according to documents filed with city planners.HGST, a unit of Western Digital, intends to construct two big, new buildings in south San Jose in an expansion of its campus that could create up to 1,700 jobs and help develop a transit and technology village for the area, according to documents filed with city planners.