volatile optical disk such as a cd rom dvd rom or other optical media can be provided in such instances each can be connected to bus 14 by one or more data media interfaces computer system may also communicate with one or more external devices 26 such as a keyboard a pointing device a display 28 etc one or more devices that enable a user to interact with computer system and or any devices e g network card modem etc that enable computer system to communicate with one or more other computing devices such communication can occur via input output i o interfaces 20 still yet computer system can communicate with one or more networks 24 such as a local area network lan a general wide area network wan and or a public network e g the internet via network adapter 22 as depicted network adapter 22 communicates with the other components of computer system via bus 14 it should be understood that although not shown other hardware and or software components could be used in conjunction with computer system examples include but are not limited to microcode device drivers redundant processing units external disk drive arrays raid systems tape drives and data archival storage systems.