Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Useless!

DO NOT BUY!!!! Bought this to use in school for a class I teach. Won't play on any of my computers which are linked to an LCD projector! Found a small note on the back of the package..."This disc is expected to play in DVD Video "play only" devices and may not play in other DVD devices including recorders and PC drives."THAT WARNING DOESN'T APPEAR ANYWHERE ON THE PRODUCT PAGE! It's USELESS to me!