I regularly burn tarballs to a CD without useing a filesystem and as long as I use the -pad option when burning I've had no problems reading them (the -pad was nessasary even when I was useing ide-scsi)
That matches my experience, at least as far as the "no problem" part, I never tried without -pad because it just seemed as if cdrecord would have a better idea of what the drive wanted than I do.
I have burned tarballs, as well as cpio (I like the checking with -Hcrc and not overwriting newer versions of a file), and more recently I have been burning encrypted filesystem images onto DVDs directly, and that works as well.
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