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Ultrix CDROM mounting

Posted on 1997-04-09
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Last Modified: 2013-12-15
I use a DECStation at work which I believe uses Ultrix. Some of our software has been downloaded to CDROM. How do I mount this CDROM under Linux? I have used the following command:

     mount -t * /dev/hdc /mnt/cdrom

with * as all the file systems from the 'mount' man page, including 'ufs' which someone said should work. The result from using 'ufs' was:

     mount: block .... , mounting read-only
     ll_rw_block: device 16:00 only 512 char blocks implemented (1024)
     ufs_read_super: unable to read superblock
     mount: wrong fs type, bad option, bad superblock on /dev/hdc, or too many mounted file sytems.

The command to mount this CDROM under the DECStation Ultrix is:

     mount -r /dev/rz5c /cdrom
and  mount -r /dev/rz5f /cdrom/admin

Any answers?
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Question by:jbduffy
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Expert Comment

by:crbild
Comment Utility
what kind of filesystems does your kernel support ?
(for see this do "cat /proc/filesystems")

and can you tell me what kind of filesystem is on the cdrom ?
the message you got is similar about the situations
in that the kernel is unable to understand the filesystem
or cause the cdrom is damaged.
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Expert Comment

by:dux
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Use the following command:
mount -t iso9660 /dev/cdrom /mnt
to mount your CD under /mnt directory.
/dev/cdrom is a link to your CDROM device which may be /dev/hdc1.
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Author Comment

by:jbduffy
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I had already tried all of the standard file systems with the '-t' option, ext2, minix, umsdos, msdos, iso9660, ext, xenix, sysv, ufs. None work.

If this helps, the office machine is a DECstation 5000/33 running Ultrix V4.3 Rev .44


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Author Comment

by:jbduffy
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In response to crhild's comment:

'cat /proc/filesystems' produces:
ext2, minix, umsdos, msdos, nodev proc, nodev nfs, iso9660, ufs

Unfortunately, I don't know which file system is on the CD, I assume it is native to Ultrix. The CD isn't damaged, it works fine at the office.
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Accepted Solution

by:
gps051097 earned 100 total points
Comment Utility
You want iso9660, the "modern" CDROM fromat. However some
manufacturers used to use older formats, which other systems
cannot read. Can you read the CDROM on a PC? I guess not.
Can you read iso9660 CDROM on the DEC machine (try it
with a CDROM that Linux CAN read!)

If so, you should migrate your company to using iso9660 ASAP,
and create all new CDROM's in that format. To do that you need two tools: mkisofs - to create a 660 MB file from all the bits,
and cdrecord, to put that image file (or partition) onto the CD.

You can find cdrecord at ftp://ftp.fokus.gmd.de/pub/unix/cdrecord
mkisofs is on sunsite or tsx-11. There are also complications
with multi-session (so create it all on one session), and
even with the TYPE of CDR MEDIA, and chemical-dyes it uses.
Some older CD-readers can't handle newer CDR's.

If necessary, you can copy the files to a PC and burn the CDROM
from there. Otherwise you are "locking yourself into DEC",
and may have a reduced set of "disaster recovery" options. Graham.
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