Need Help!!!!

[Mr.Yoshiizu]

Hello,
as I am new to all this backup stuff,i bought myself swap magic.2
to play my backups!!but by now several problems have come up!

1. i heard that swap magic might damage my ps2(?),
2. i made a few backups of games like "enter the matrix" and "gta:vice city" and they are working fine,but now i tried to backup "nfs:underground","manhunt","true crime:streets of l.a." and after the intro the game freezes.

i don't know what i'm doing wrong,so maybe you guys could help me(!?)

i'm using;

lsg gsa 4040b dvdram burner,
sunstar dvd-r media,
copying with nero 6(make an image on hardrive etc.)

thanks

Mr.Yoshiizu