"Erik E. Fair" wrote:

> I'm not thinking of running long-term this way (I got a warning in E-mail
> that CD-ROM drives don't like to be run 24x7; they die), but it would be
> good to have a robust install/rescue/recovery CD-ROM environment that could
> run a full NetBSD system off a CD-ROM.

If you're just after a install/rescue/recovery tool, why not use a
ramdisk filesystem with everything you need in there?  If memory size
is an issue you could go as far as having a ramdisk root and CD-ROM
/usr.

Simon.