If you get a CDROM that is not from the stoneage you would be able to read CD's written on a PC as long as you use the standard ISO modes.
Unfortunatly, if you use the standard CD filesystem with the Amiga you can only read PC CD's with DOS 8.3 names.
For floppys I suggest FAT95 from aminet. CrossDOS that is included in AmigaOS suxx!