Re: ISO file format vs. SCSI CD model

On 2006-06-13, corinna.schultz@xxxxxxxxx <corinna.schultz@xxxxxxxxx> wrote:

My question is: Is the format of an ISO file identical to the physical
format of a CD (as described in the SCSI MMC standard)? By which I
mean: sync bytes, subchannel information, interleaved small frames,
lead-in (with PMA data), EFM encoding, error correction codes (there's
several layers, IIRC).

No. The ISO file only contains the "payload".

I'm really only interested in data CDs and DVDs, not audio or
video.

If I were to look at the raw bytes of an ISO file, and compare
that with the raw bytes of a physical CD, would they match?

No. I don't think physical CDs even _have_ raw bytes. IIRC,
they have raw bits similar to hard-drives.

(Right now I can't actually do that, otherwise I'd be able to
test it and see, sorry.)

If not, what are the differences (or where can I find
documentation on what the difference is)?

Don't the standards you've looked at specify how a 2K block of
"user" data is encoded on the disk surface?

I have searched everywhere I can think of, but have been
unable to find anything definitive, so I'm asking you guys
now.

Why does it matter unless you're actually designing drive
electronics? (In which case you wouldn't be asking questions
like this in this newsgroup.)

--
Grant Edwards grante Yow! Eisenhower!! Your
at mimeograph machine upsets
visi.com my stomach!!
.