[CLUE-Tech] Dumb ISO Size Question

[Jed S. Baer]

OK, this feels like a really lame question, but it seems like sometimes
the easiest ones are the most elusive.

How much data, really, can I stuff onto an "80 minute" CD-R?

I just burned one. The ISO image is 692322304 bytes. OK, that's about
660MB which is what both mkisofs and cdrecord reported. But, before
building the ISO, du reported 690MB for the files on disk. So, is the
difference there due to slack/overhead in ext2fs that isn't present in
ISO9660?

For that matter, how big are these platters? I'm assuming the 700MB label
is rounded down from some non-marketing-speak real capacity number.

As long as I'm rambling on, mkisofs will do a dry-run mode, which can be
used to report the size of the ISO, without creating it, but if there's a
way to get it to report in MB, I haven't found it.

BTW, from the Fuji precautions list:
  To clean the recording surface ...
  DO NOT USE gasoline, kerosene, lacquer-thinner ...

I'm surprised it doesn't say "Do not ingest."

jed
-- 
I wouldn't even think about bribing a rottweiler with a steak that
didn't weigh more than I do. -- Jason Earl