how to make ISO files

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hi people
help total newbie ,im desperated
ive searched overall in the google but i couldnt find a guide how to make iso files from burned dreamcast games
i have the orginal cosmic smash game but my dreamcast broken,so ive downloaded now the game and burned it on cd,i need guide how to convert this cd to an ISO file
ive tried it with isobuster but can make only some tao and bin files
i want to play the game with chanka emulator
help,i dont know what to do
just a link or something!