Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not compatible with all DVD disks

I bought this unit due to its size and the listed features on the box. I've played a number of DVDs in this player and only about half play without issue. A number of the disks won't play at all. I wish I had done more research before buying this. As it is, the player goes back to the store and I'll be looking for another small DVD player.