It sounds like the default SuSE installer doesn't have any drivers for your Pc-card based cdrom.
You can try dropping to a terminal (try Ctrl+Alt+F1,f2, f3 or f4) and typing this at the prompt:
look for 'pcmcia'. If it does not list it, the pcmcia (pc card) drivers are not loaded.
You can try loading yourself by typing:
however, this rarely works because the installer is a very cut down linux system.
If it does work, you will still most likely need to find out what driver your Sony drive uses, I suggest a little googling for your model and a linux driver to find out what the module is called.
If you find out what it is, try modprobing that module too, eg:
where sonycdrom is the name of the driver you found.
Then nip back to the installer screen (ctrl+alt+f1 or whatever it's on f1-f12) and try again.
If that fails, perhaps you will have better luck with another system. Try Ubuntu for example - it's got a lot of drivers, but usually SuSE is very good.