Problems with cd burner

[Devin Whalen]

On Tue, 2005-05-24 at 13:56 -0400, Lennart Sorensen wrote:
> On Tue, May 24, 2005 at 01:46:12PM -0400, Devin Whalen wrote:
> > I am trying to burn some files on my Linux box but I can't seem to mount
> > the cd-rw drive as rw.  It is a usb cd burner and it is getting picked
> > up by the system but when I try to mount it I get this error:
> > 
> > /home/devin root at localhost:]$mount -o rw /mnt/cdrom2/
> > mount: block device /dev/sr0 is write-protected, mounting read-only
> 
> Linux only supports ro on iso9660 since iso9660 is a readonly filesystem
> by design.  If you want to sue a cd-rw in read/write mode it has to be
> formated with UDF for packet writing and you have to get a kernel with
> packet writing support, which I belive is still rather experimental and
> doesn't work with all drives.
> 
> Using cd-rw as just a reusable cd on the other hand is simple.  cdrecord
> has a -blank option for clearing the cd-rw before writing another
> premade iso image to the disc which can then be mounted ro as usual.
> 
> > Then when I type mount I get this for the cdrom:
> > /dev/sr0 on /mnt/cdrom2 type iso9660
> > (ro,noexec,nosuid,nodev,users,umask=0022,iocharset=iso8859-1,codepage=850)
> > 
> > 
> > I tried editing my /etc/fstab file:
> > /dev/sr0 /mnt/cdrom2 auto
> > umask=0022,user,iocharset=iso8859-1,codepage=850,noauto,rw,exec,users 0
> > 0
> > That seems right to me...but obviously isn't working.  How could it be
> > write-protected?  There must be some option I am missing.
> 
> > BTW, here is what I am using:
> > [/home/devin root at localhost:]$uname -a
> > Linux localhost 2.6.8.1-10mdk #1 Wed Sep 8 17:00:52 CEST 2004 i686
> > Intel(R) Pentium(R) 4 CPU 1.60GHz unknown GNU/Linux
> 
> Well look at udftools for info on packet writing on cd-rw/dvd-rw drives.
> 
> Package: udftools
> Priority: extra
> Section: otherosfs
> Installed-Size: 195
> Maintainer: Richard Atterer <atterer-8fiUuRrzOP0dnm+yROfE0A at public.gmane.org>
> Architecture: i386
> Version: 1.0.0b3-9
> Depends: libc6 (>= 2.3.2.ds1-4), libreadline5, debconf (>= 0.9.41), makedev (>= 2.3.1-56)
> Filename: pool/main/u/udftools/udftools_1.0.0b3-9_i386.deb
> Size: 72208
> MD5sum: a89afd0ae2a5415687c744ca585c0aa2
> Description: tools for UDF filesystems and DVD/CD-R(W) drives
>  This package contains a number of user-space tools related to
>  creating filesystems in the UDF (Universal Disk Format), which is
>  primarily used for DVDs, but sometimes also CD-ROMs:
>  .
>   mkudffs - Format a device, creating an empty UDF filesystem
>   cdrwtool - Low-level drive management (e.g. set writing speed, format)
>   pktsetup - Set up a packet writing device (/dev/pktcdvd0) for a drive
>   wrudf - Maintains a UDF filesystem
>  .
>  Homepage: http://sourceforge.net/projects/linux-udf/
> 
> DVD-RAM drives you just mount and use a a regular block device formated
> as UDF which is a handy 4.5G backup device, but rather expensive for
> media and hard to find drives for.  DVD-RW and DVD+RW is trivial to
> append files to using growisofs which is what I prefer doing personally.
> I hardly ever see a need to a CD or DVD sized floppy with the ability to
> erase and create files at random.  Adding files I do quite a bit though.
> Certainly the packet writing stuff is just too much hassle (even on
> windows it can be a real pain to deal with as the cd writing tools fight
> the packet writing directCD stuff over who is in charge of the drive).
> 
> Lennart Sorensen
> --

Thanks for all the replies.  Once I found out that I didn't need my cd
to be mounted as rw, I was able to burn my files onto it.  I was having
a problem with gcombust.  It was throwing errors every time I tried to
burn with it, when I looked in fstab, I thought the problem was that it
was ro.  So, I just switched to gtoaster and it all went fine.

Thanks for the help.

Later

-- 
Devin Whalen
Programmer
Synaptic Vision Inc
Phone-(416) 539-0801
Fax- (416) 539-8280
1179A King St. West
Toronto, Ontario
Suite 309 M6K 3C5
Home-(416) 653-3982


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