now that you have created the device for your cdrom, you must create a directory where you can mount it, check if you have this directory /mnt/cdrom, it usually comes with the install. But in this case I doubt it. If you don't have it, create it using mkdir. first cd into /mnt then do "mkdir cdrom". After this, mount it using "mount /dev/sonycd535 /mnt/cdrom". If this works, then for future ref you can link the cdrom device name to an easier name you can remember, like "ln -s /dev/sonycd535 /dev/cdrom" and the next time you mount it, you just used "mount /dev/cdrom /mnt/cdrom"

good luck, let me know how it turns out.