[AmyStar] “Also how long before a camera stops being usable to capture with? “
That is kind of like asking how long a car will run. Cameras are not made to capture with, that is not saying that you cannot do it, just that the transport systems are not a beefy as decks. It is never recommend to you our production camera as a deck but people do it all the time. There is no way to give a firm answer, just a warning.
[AmyStar] “Is it possible that a firewire cable can malfuntion a camera?”
Are you asking, can connecting a cable damage a camera or make it act weird? I know Panasonic states you are to plug in the cable to the camera first and then to the computer/firestore and then turning the camera on. Any time is power involved a problem can happen.