mounting CD-RW on Fedora Core 2

[James Wilkinson]

John Que wrote:
> I have a SAMSUNG CD-RW (52x24x52).
> Previuosly I had used it successfully in RedHat 9.
> If I remember well , I added in grub.conf something like hdc=ide-scsi
> (It was quite a time ago).
This is no longer needed.

> Now I had recently upgradced to Fedora Core 2.
> When booting Fedora,I see
> in kernel log  that the SAMSUNG CD-R is being recognized as hdc.
> 
> Should I add something in grub.conf ?
No.
> I saw that in 2.6 kernel there is ide-cd ; should I add somethng like
> hdc=ide-cd in grub.conf ?
No.
> Should I specify something regarding DMA in grub.conf ? (Now there is
> nothing about DMA in grub.conf)
No.

> I had tried mounting the CDROM like thus: (I am not sure at all it's OK)
> mount -t iso9660 /dev/cdrom /mnt/cdrom
> but I got many errors in the log (hdc: DMA timeout retry and hdc: status 
> error : error =0x00 and
> hdc:  drive not ready for command).

Yes, you're right that this could be a DMA error. But forget grub.conf,
it's not relevant for this.

When you say that you used this on RH9, was that on the same computer?
Has anything been done internally? Especially, has anything been added
or removed? Has this been working with another OS? (Are you sure it's
still working?) What sort of computer is this?

Have you checked with several CDs?

Try running
hdparm /dev/hdc
to take a look at the state of the drive. If you find that it reports
 using_dma    =  1 (on)
then try running
hdparm -d0 /dev/hdc

Then try mounting it again. If that fixes it, then copy
/etc/sysconfig/harddisks to /etc/sysconfig/harddiskhdc, edit the hdc
copy of the file, and change
# USE_DMA=1
to
USE_DMA=0

Hope this helps,

James.

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