CD-R data organisation

Dimiter Popoff tgi_earth at
Thu Feb 15 21:47:33 PST 2001

* From the T10 Reflector (t10 at, posted by:
* Dimiter Popoff <tgi_earth at>
Hi all,
I have just begun to access the ATAPI CD-ROM of my new system and
I have two - probably beginner's - questions:

1. The MMC documents (I have MMC-3 here) state that in response to
a READ CAPACITY the drive should say "2048" block size. Well it does
not - I tried all the CDs I have around.It says $930 - 2352 block size.
Not only that, but I can read such blocks and I see files I know are
there which look quite OK? I can just hex view what's there, so here
is the next question

2. How are the data organized on the disk (OK, disc)?
It does not look like an MSDOS/Windows file system (which I know, I wrote
a translator to DPS a while ago). Is there any document describing
that? All I want is a quick way to access the files, I don't need
any audio etc. fancy stuff for the time being.



Dimiter Popoff
Transgalactic Instruments, Gourko Str. 25 b, 1000 Sofia, Bulgaria
Email: tgi at, tgi_earth at
Phone: 00359/2/9923340, 00359/2/9805997, Fax: 00359/2/9540384

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