翻译：随这本书附赠的那个光盘,如果你没仅把它当做一个杯垫用的话,你兴许会发觉它比你想的有趣的多.
这句里面只有一个谓语found,use不是谓语动词而是不定式not to use.不定式是不能做谓语的,它是if you do not use it as a coaster这个条件状语从句的省略形式.
if not to use as a coaster,you would have found the disc (included with this book) far too attractive.