Invalid disk

I contacted Gateway and found out that the AR-230 will not work with anything more than 4x DVD's. Usually it will format DVD-RW's but avoid memorex brand. Usually any other cheep brand will work.

I have a similar problem except my ar-230 has always played anything I have put in it until recently. Now old dvds that were recorded both on the system and my pc all of a sudden give an invalid disk message even though they have been watched on the system many times before. Funny thing is that it will still play store bought dvds and few rewritables. I don't understand why the exact dvds that used to be played on the system no longer play. Most of my dvds are recorded on Maxwell disks.