The CF card is in the first channel alone
The CD DVD rom is in the secon chanel.
The CF card is connected direcly by means of an Adapta.It works perfectly because I boot the system from her and can do anything with it.
The CD/dvd is indepently connected to the secon chanel
... which is all well and good when everything plays by the rules... But the dual channel IDE in an A1200 is effectively a hack, and relies on certain assumptions to work. That being the case, are you sure you have the correct unit and device for your CD drive's DOSDriver? Depending on the adaptor it could be scsi.device unit 3, atapi.device unit 3 and so on. Amigas don't support Cable Select so if you are trying to use this it might also be an issue. I still think it's worth trying the CD-ROM by itself, maybe on the primary channel, just to make sure it's compatible and working.