Certain disks not being read

The disks I have bought for my gamecube from second hand and brand new form ebay don’t work. I tried everything I can to the disk and the lens but nothing has improved. The disks in question is Mario cart double dash and Sonic Riders, the disks have not many scratches or none at all However my other disks have many scratches on them and they work fine, maybe its just bad luck or the disks being printed wrong as Double dash has this white substance around the centre and black lines from the front around it. But I need help to narrow my problem down.