PS2 ver. 3 loading problems (media?)

[fiedes]

I have a ver. 3 ps2 with a magic 3.1 which doesn't boot my dvd+r's very good. Every other time I try, the drive will stall before showing the playstation 2 logo, make weird loading noises, and bring up the red "insert ps2 disc" screen. I am currently using dvd+r's and have tried a single dvd-r with seemingly worse results than the + ones. Can it be a problem with my chip or is my ps2 too feeble to read burned dvd's? Original games and CD-r backups work fine.

Can anyone tell me what book type should be best for my unit version ?