what is a .cdi and uther problems (newbe)

[orpheus]

ok ferst iv looked round and cant find the info i need.

ok what is a .cdi file (im on a mac osx/os9) is it an iso? or do i just bern it as the single file?

ok iv got a nice new power book a mac laptop its got cd/dvd berner bilet in and i use toast 6 to bern cd/dvd's that's all iv got to work with till i go back to uni then my frend has a nice pc which i can use but i dont want to wait.

i think my dream cast can play back-up's becuase it playes half life and a back up of skyes of acadear but i tryed to make a utopear boot-cd but all that hapend was my dream cast showerd a black scren for a second then went back to the logo.

can you help?