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<H3 align="left"><img src="../../gx/dennis/bbubble.gif"
height="50" width="60" alt="(!) " border="0"
>cd-writing mini-howto</H3>
<p align="right"><strong>Answer By Chris Coyle
<br></strong></p>
<!-- sig -->
<BLOCKQUOTE>
I found the "CD-Writing with an ATAPI CDR Mini-HOWTO"
(<A HREF="http://www.linuxgazette.com/issue57/stoddard.html"
>http://www.linuxgazette.com/issue57/stoddard.html</A>)
very helpful. Thank you.
</BLOCKQUOTE>
<BLOCKQUOTE>
Here are a couple of suggestions which other readers
who are interested in the same subject may find useful.
</BLOCKQUOTE>
<BLOCKQUOTE><ol>
<li> (very minor) I think it should be <TT>/etc/modules.conf</TT>
not <TT>/etc/conf.modules</TT>
<li> I just discovered that the ide-scsi module
in kernel 2.2.17 (from RH rpms I just DL'ed),
either has a big problem, or else it is significantly
incompatible with previous kernels.
</ol>
</BLOCKQUOTE>
<BLOCKQUOTE>
Here's what happened:
</BLOCKQUOTE>
<BLOCKQUOTE>
I DL'ed and installed the RH rpms for kernel 2.2.17-14.
These were recommended in a security advisory.
I kept my previous kernel (2.2.16) installed just in case,
adding a new section to <TT>/etc/lilo.conf</TT> by copying the
previous one, mutatis mutandis. Then I ran lilo and rebooted.
At first everything appeared to be OK with the new kernel,
but then I tried to mount my cd-rom and it failed, giving
the message
</BLOCKQuote>
<BLOCKQUOTE><pre>
mount: wrong fs type, bad option, bad superblock
on /dev/cdrom or too many mounted filesystems
</pre></BLOCKQUOTE>
<BLOCKQUOTE>
While I was searching for the cause of this I remembered
that I had set up my cd-recorder to use ide-scsi.
</BLOCKQUOTE>
<BLOCKQUOTE>
My regular cd-rom reader is hdc and the cd-recorder is hdd.
Following the directions in your mini-howto, I had inserted
</BLOCKQUOTE>
<BLOCKQUOTE><BLOCKQUOTE><code>
append="hdd=ide-scsi"
</code></BLOCKQUOTE></BLOCKQUOTE>
<BLOCKQUOTE>
and this I had copied faithfully into the new 2.2.17 section.
When I removed it and rebooted, I found I could mount the
cd-rom again. Then I put the line back in and rebooted.
</BLOCKQUOTE>
<BLOCKQUOTE>
This time I looked at what scsi devices were detected.
Eureka! By looking at dmesg and also by using
"cdrecord -scanbus" I discovered that the ide-scsi module
had taken over both hdc and hdd, even though I requested
only hdd. I asked for help on comp.os.linux.misc and
within hours someone else confirmed the same thing, namely
</BLOCKQUOTE>
<BLOCKQUOTE>
"...if you have two devices on an IDE channel,
and one of them is under ide-scsi emulation,
it's better to treat both of them as if they
were under ide-scsi emulation.
</BLOCKQUOTE>
<BLOCKQUOTE>
I don't know if this is due to a an error or a design
change, but the work-around was quite straightforward.
</BLOCKQUOTE>
<BLOCKQUOTE>
The only tricky bit was that I wanted to be able to
boot 2.2.16 so I had to devise a way to make both kernels
boot up in a state where they could use the same devices
and configuration files. My solution is as follows:
</BLOCKQUOTE>
<BLOCKQUOTE><ol type="a">
<li> Change the lines in <TT>/etc/lilo.conf</TT> to
<BLOCKQUOTE>
append="hdc=ide-scsi hdd=ide-scsi"
</BLOCKQUOTE>
in both kernel sections.
<li> Move the <TT>/dev/cdrom</TT> link from hdc to scd0.
<li> Change the scsi configuration for the cd-recorder
in <TT>/etc/cdrecord.conf</TT> to 0,1,0 (since it is now the
second scsi host).
</ol></BLOCKQUOTE>
<BLOCKQUOTE>
After all that I am finally back to the point where I
can mount the cd-rom and use the cd-recorder, with either
2.2.16 or 2.2.17 kernel.
</BLOCKQUOTE>
<!-- end 17 -->
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