I discovered the disadvantage of putting an Ext2 File System on DVD+RW:
FreeBSD and NetBSD can't mount it, even though they're fine with Ext2 on a
Hard Disk partition.
Also alas, the Website of Robert Derman, http://www.dermancomputer.com
seems to have vanished, along with his useful free E-Book: "You Can Build Your
Faictz Ce Que Vouldras: Frank Mitchell