Firstly, are you using a CD-R or CD-RW disc? Most old drives will only read a CD-R.
Secondly, Mac OS Standard format (HFS) is the one you want, not HFS+ nor ISO 9660. (yes, a Mac will read an ISO 9660 disc with the right software installed, but its just easier to use HFS)
Secondly, Mac OS Standard format (HFS) is the one you want, not HFS+ nor ISO 9660. (yes, a Mac will read an ISO 9660 disc with the right software installed, but its just easier to use HFS)