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Old 03-20-2005, 05:04 PM   #1
cmbguy
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Registered: Aug 2004
Distribution: Ubuntu 6.06, usually with icewm
Posts: 4

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can't mount cdrom (after mounting .iso once, using -o loop)


All of a sudden, about two days ago, I can no longer mount iso9660 cds to read them. Here is what I'm using, and the result:

$ mount /dev/cdrom
mount: wrong fs type, bad option, bad superblock on /dev/cdrom,
or too many mounted file systems
(could this be the IDE device where you in fact use
ide-scsi so that sr0 or sda or so is needed?)

and here is my /etc/fstab:

$ cat /etc/fstab
LABEL=/1 / ext3 defaults 1 1
none /dev/pts devpts gid=5,mode=620 0 0
LABEL=/ /home ext3 defaults 1 2
none /proc proc defaults 0 0
none /dev/shm tmpfs defaults 0 0
/dev/hdb3 swap swap defaults 0 0
/dev/fd0 /mnt/floppy auto noauto,users,kudzu 0 0
none /var/lib/jack/tmp tmpfs defaults 0 0
# /dev/hda1 /mnt/Win98 vfat defaults 0 0
# /dev/hda5 /mnt/Win98data vfat defaults 0 0
/dev/hdd /mnt/zip auto noauto,owner,exec,users 0 0
/dev/sda1 /mnt/flash auto noauto,owner,kudzu 0 0
/dev/cdrom /mnt/cdrom iso9660 noauto,user,ro 0 0

Just today, after reading some posts on this site, I made some changes to the last line: I tried removing "udf," from just before "iso9660", and I changed "owner" to "user". I also looked in /dev and found that /dev/cdrom is a link to /dev/hdc (which is where it seems like it should be, since my cd burner is the master device on the 2nd IDE cable).

It seems like this started happening after I found out that you could mount .iso images that were files on your hard drive by using the -o loop option to the mount command. I tried it, and it does work (still does), here's an example I did just now:

$ sudo mount -t iso9660 -o loop ./FC3-i386-disc3.iso /mnt/cdrom/
$ ls /mnt/cdrom/
eula.txt RPM-GPG-KEY RPM-GPG-KEY-fedora-rawhide TRANS.TBL
Fedora RPM-GPG-KEY-beta RPM-GPG-KEY-fedora-test
GPL RPM-GPG-KEY-fedora RPM-GPG-KEY-rawhide

My cdrom is actually a CDRW drive, a Plextor Plexwriter 8/4/32 A. Oh, and burning cds using cdrecord still works just fine (I think - I can't actually mount them to double-check!).

Any suggestions or ideas would be appreciated!

-Carl
 
Old 03-20-2005, 05:27 PM   #2
Komakino
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Registered: Feb 2004
Location: Somerset, England
Distribution: Slackware 10.2, Slackware 10.0, Ubuntu 9.10
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Urgh!! If you're gonna post file output then put code brackets around it!!!:
Code:
LABEL=/1 / ext3 defaults 1 1
none /dev/pts devpts gid=5,mode=620 0 0
LABEL=/ /home ext3 defaults 1 2
none /proc proc defaults 0 0
none /dev/shm tmpfs defaults 0 0
/dev/hdb3 swap swap defaults 0 0
/dev/fd0 /mnt/floppy auto noauto,users,kudzu 0 0
none /var/lib/jack/tmp tmpfs defaults 0 0
# /dev/hda1 /mnt/Win98 vfat defaults 0 0
# /dev/hda5 /mnt/Win98data vfat defaults 0 0
/dev/hdd /mnt/zip auto noauto,owner,exec,users 0 0
/dev/sda1 /mnt/flash auto noauto,owner,kudzu 0 0
/dev/cdrom /mnt/cdrom iso9660 noauto,user,ro 0 0
If you're using a 2.4 kernel and have scsi emulation enabled to write to CD then you should probably be mounting /dev/sr0 rather than /dev/cdrom (or you could symlink /dev/cdrom to /dev/sr0).

Try that, see if it works:

mount -t iso9660 /dev/sr0 /mnt/cdrom
 
Old 03-20-2005, 05:34 PM   #3
t3gah
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Registered: Dec 2004
Distribution: SuSE, RedHat, ubuntu, Debian
Posts: 734

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it's

/dev/cdrecorder

no?
 
Old 03-20-2005, 05:52 PM   #4
Komakino
Senior Member
 
Registered: Feb 2004
Location: Somerset, England
Distribution: Slackware 10.2, Slackware 10.0, Ubuntu 9.10
Posts: 1,938

Rep: Reputation: 53
Quote:
Originally posted by t3gah
it's

/dev/cdrecorder

no?
That's just a symlink like /dev/cdrom...it's going to point to either an emulated scsi device or in later kernels, an actual eide (ATAPI) writer. something like /dev/sr0 or /dev/hdc
 
Old 03-20-2005, 11:25 PM   #5
cmbguy
LQ Newbie
 
Registered: Aug 2004
Distribution: Ubuntu 6.06, usually with icewm
Posts: 4

Original Poster
Rep: Reputation: 0
Well, I tried your suggestion, using sr0, and I got the error message

Code:
mount: special device /dev/sr0 does not exist
I tried it with sr1, 2, and 3, too, (just to be sure) and got the same result. And yes, my /dev/cdrom is a symlink to /dev/hdc.

By the way, I just discovered that now I can't mount my flash card reader either (the one that's listed as /dev/sda1 in my fstab). I get a different error message:

Code:
mount: /dev/sda1 is not a valid block device
Oh, and sorry about not using the code brackets! I was wondering how people got those cool boxes around parts of their posts!

- Carl

Last edited by cmbguy; 03-20-2005 at 11:30 PM.
 
  


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