Asus DVD problem
 

Recently i adquired a Asus DVD 12x, and i don't now why, but when i put a data cdrom in the drive, it sais me, that exist a track01.cda (cd music).
I've two hd (13gb+10gb), a CDRW and the DVD. The disks are at "master" and the others at "slave", because i use clonecd (betwen others), and the cd drives must be in diferents "ide's". Can anyone explain me why is that happening!?
KuTo