можно ли замаунтить cdrom так, что-бы система его принимала за фаил iso?

Ну по идее /dev/cdrom можешь использовать как ISO файл

may be cdfs ?????

http://www.elis.rug.ac.be/~ronsse/cdfs/

CDfs is a file system for Linux systems that `exports' all tracks and boot images on a CD as normal files. These files can then be mounted (e.g. for ISO and boot images), copied, played (audio and VideoCD tracks)... The primary goal for developing this file system was to `unlock' information in old ISO images.