Looking for a big boost out of its current financial doldrums, Sun Microsystems unveiled a line of data storage systems this week that it hopes will establish the Santa Clara, Calif., company as a new force in a growing market. Sun is unveiling three new “storage appliances” — industrial-strength computers designed for corporations and other organizations that need to store and retrieve large amounts of data — that represent the first extensive use of its open source software with solid-state memory drives, in combination with more commonly used rotating disk drives.