LINUX support for CD-R, CD-RW, packet writers?

LINUX support for CD-R, CD-RW, packet writers?

Post by Andy Gle » Wed, 07 Apr 1999 04:00:00



Q: what level of LINUX support is there for CD-R and CD-RW?

I assume that LINUX can do whole CD or track oriented CD creation.

I am mainly curious as to whether LINUX supports "packet writing"
to CD and CD-RW --- the sort of thing that Adaptec Direct-CD supports
on Windows.

Basically, an incrementally modifiable filesystem for CDs, as opposed
to the original CD filesystems that required the whole CD, or a large
chunk thereof, to be written at once. The old CD filesystems typically
required data streaming, high speed SCSI with everything cleared
out of the way to prevent interruptions and other bus traffic while writing
a CD. The newer packet writers allow the CD to be used pretty much like
a floppy disk, and still allow ISO-standard filesystems to be created.


 
 
 

LINUX support for CD-R, CD-RW, packet writers?

Post by Mark Turne » Wed, 07 Apr 1999 04:00:00


: Q: what level of LINUX support is there for CD-R and CD-RW?

Linux handles (at least) CD-R stuff fairly well. Check here for
more information:
http://metalab.unc.edu/LDP/HOWTO/CD-Writing-HOWTO.html

--
Mark Turner
Linux Support Specialist
Indelible Blue, Inc.
http://www.indelible-blue.com/linux

 
 
 

LINUX support for CD-R, CD-RW, packet writers?

Post by Dominique Lo » Tue, 13 Apr 1999 04:00:00



>Q: what level of LINUX support is there for CD-R and CD-RW?

>I assume that LINUX can do whole CD or track oriented CD creation.

>I am mainly curious as to whether LINUX supports "packet writing"
>to CD and CD-RW --- the sort of thing that Adaptec Direct-CD supports
>on Windows.

>Basically, an incrementally modifiable filesystem for CDs, as opposed
>to the original CD filesystems that required the whole CD, or a large
>chunk thereof, to be written at once. The old CD filesystems typically
>required data streaming, high speed SCSI with everything cleared
>out of the way to prevent interruptions and other bus traffic while writing
>a CD. The newer packet writers allow the CD to be used pretty much like
>a floppy disk, and still allow ISO-standard filesystems to be created.



This filesystem is called UDF, and will be used for DVD also

Take a look at
http://trylinux.com/projects/udf/index.html

Dominique LOVY, Dept. of Physical Chemistry, University of GENEVA
30 Quai Ansermet, CH-1211 GENEVE 4 (Switzerland)
Phone : ++41 22 702 65 25    Fax : ++41 22 602 65 18

 
 
 

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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