On Fri, 24 Nov 2000 19:12:09 -0500 (EST),
"Mike A. Harris" <[EMAIL PROTECTED]> noted:
> Direct CD is just an application. It writes to both CDR and CDRW
> using the UDF filesystem (packet writing). In the case of CDRW,
> this allows you to treat a CDRW as a big floppy disk. If you
> require this functionality, then you MUST use UDF under Linux,
> and it isn't a finished product. You need a 2.4.0 kernel and
> maybe some magic.
Thank you for saving me the time to look up the correct terms for the
packet writing. I'm not sure about the degree of magic needed, the
2.4.0test10 config (last one I have here) shows:
# CONFIG_UDF_FS is not set
# CONFIG_UDF_RW is not set
so I am guessing that this stuff is now in the kernel at the bleeding
edge.
It is not clear to me where the line falls between the physical (treat
the CDRW like a floppy) and the logical (UDF filesystem). I have a
distinct feeling that I've seen something about using other filesystems
with packet writing, but I have no idea why this might be desirable.
> I'd just stick to using CDRW's like eraseable CDR's.
So would I, but I don't try to use them for information exchange. As
noted in the following, there may be more of a problem, because it
sounds as if one application is using UDF and one isn't, yet another
issue. I don't know if there's going to be ANY easy answer in Linux for
that.
> >The difficult story began when I recently purchase a new CDWriter. It does
> >not support DirectCD but only running Nero therefore I am compelled to
> >maintain 3 machines with 3 CDWriters, one on M$Win98 with DirectCD, another
> >on M$Win98 with Nero and another on Linux with CDRoast. The CDRW created
> >with DirectCD could not be read on the machine running Nero and vice versa
> >because of different format.
Depending on the state of your disk space and courage, you could run
WinXX under VMware, WinVM, or whatever and at least get at the data.
>
> It all comes down to iso9660 or UDF. iso9660 is supported in
> Linux (official stable) and UDF is not.
>
> >So I am now looking for a solution with a hope from the list because I have
> >a stock CDRW having data recorded with DirectCD. What I expect is a
> >solution for cross reading of CDRW created between DirectCD and Nero
> >respectively
Unfortunately, the is no "stock" CDRW, any more than there is a stock
floppy. Many formats. If you are willing to go to a development kernel I
believe you will be able to do UDF, certainly the read, probably the
write. You can read ISO9660, but you can't read the DirectCD format, so
in that sense it's not the most widely used format.
> I can't help or even guess about DirectCD and Nero as they are
> applications only, not CD formats. If they both do UDF, and it
> is compatible with the current devel Linux UDF code, you should
> be in luck.
>
> UDF is what you want in Linux to do what you need. Not an
> application, but a filesystem driver.
You are probably right about the base format UDF, but I'm not even
totally convinced of that, given that he can't read between the formats
and hasn't clarified if he can't see the files or can't read the data.
This is a really interesting problem, and I can't tell you how glad I
am that it's not mine;-)
--
-bill davidsen ([EMAIL PROTECTED])
"The secret to procrastination is to put things off until the
last possible moment - but no longer" -me
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