USB Modchip question / general ?'s

[Shoyru25x]

ya uh i was wonderin.. im gonna buy a USB mod chip off modchip.com and i was wondering a couple things.

1.Do mod chips play backup dvd's?
2.say i downloaded a back up (copyed) game from some program and put it on a cd would it work in my mod chip or do i need to add the patch found at megagames.com?
3. what do patches do and wht r they used for
4.how do u succsessfully copy a game and make it work on a mod chip (or download like a games bin and cue file)?