1. Reading CD-R & CD-RW with an ATAPI HP 7200e CD-Writer on RH 6.0...
I am presently unable to read CD-RWs or CD-Rs that are
not closed. I want to use both as lightweight backups.
I would prefer not to have to build a kernel. Reading
relevant posts has left me confused. (I am presently
assuming that the issue is UDF.)
Do you know if what I am trying to do is impossible, or
can you suggest pointers to continue investigation?
Any info would be appreciated.
Thanks, Joe
PS.
The following may be germane, but I don't want to
distract from my question :-)
I use DirectCD on w95/98 to write the CD-RW and CD-Rs.
(I am assuming that I can use cdwriter to write, but so
far have only verified that I can use -eject and -load
to open and shut the drive tray :-))
I can read CR-ROMs and closed CD-Rs. This took me a while,
using the following magic:
modprobe parport
modprobe paride
modprobe epat
modprobe pcd
mount -t iso9660 /dev/pcd0 /mnt/cdrw
If I try to mount a CD-R or CD-RW, I get the following barf:
mount: block device /dev/pcd0 is write-protected,
mounting read-only
mount: wrong fs type, bad option, bad superblock on
/dev/pcd0, or too many mounted file systems
The issue would appear to be UDF. I downloaded udf-0.8.8
from http://www.csc.calpoly.edu/~bfennema/udf.html (this
seems to me to not require a kernel patch). I built this,
installed, did the modprobe udf, but when I did
mount -t udf /dev/pcd0 /mnt/cdrw
with any CD in the drive (CD-{ROM,RW,R}), the CD-Writer
gurgled briefly and then my machine hung. I waited for
5 mins. but it still remained unresponsive. I rebooted
and repeated many times.
I read the FAQ in the udf-0.8.9.1 download (from
http://www.trylinux.com/projects/udf/index.html), and
was confused by the following:
2.3) Can I read DirectCD (or other packet-writing
software) discs with this driver?
Yes, you should be able to.
but later the FAQ writes:
3.2) How come some discs can be read in DirectCD,
but not with this driver?
Usually, these are discs that DirectCD (or other
packet-writing software) has not 'closed', ie,
finished writing the UDF volume information. Some
of these discs will cause the kernel to crash in the
lower-level driver, even if the UDF driver isn't
loaded. More work needs to be done to understand this
problem.
So it would appear that I can't read CD-RWs or open CD-Rs
for the moment?
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