LinuxQuestions.org - I get mount: /dev/cdrom: can't read superblock, How to fix?

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I get mount: /dev/cdrom: can't read superblock, How to fix?

Hi guys, I know it must be some dumb mistake I did, but when I'm trying to mount my drives, they say

mount: /dev/cdrom: can't read superblock

I just compiled my new 2.4.21 kernel, how can I fix this?

thanks for the help, :)

have you got isofs built into the kernel or as a module, if its a module try modprobing it before you mount, also might be worth a check where /dev/cdrom points to

ehmm, well, it works with my previous kernel, why won't it work with this one?, did I forget something, or what?

I'll check the isofs thing, thanks.

yes, ISO file system for CD-ROM's is built into the kernel.

what can I do next?, need more help, thank you

does the output of cat /proc/filesystems contain either isofs or iso9660

OKay, I did that command, and YES, it is in there man. Thanks, any other thoughts?

cat /proc/filesystems
nodev rootfs
nodev bdev
nodev proc
nodev sockfs
nodev tmpfs
nodev shm
nodev pipefs
nodev binfmt_misc
ext3
ext2
cramfs
nodev ramfs
minix
msdos
msdos
vfat
iso9660
vxfs
nodev nfs
ntfs
efs
nodev autofs
nodev devpts
nodev usbdevfs
nodev usbfs

what does your /etc/fstab say? specifically the line with /mnt/cdrom in it?

here's the Fstab:

LABEL=/ / ext3 defaults 1 1
LABEL=/boot /boot ext3 defaults 1 2
none /dev/pts devpts gid=5,mode=620 0 0
none /proc proc defaults 0 0
none /dev/shm tmpfs defaults 0 0
/dev/hda5 swap swap defaults 0 0
/dev/fd0 /mnt/floppy auto noauto,owner,kudzu 0 0
/dev/cdrom /mnt/cdrom iso9660 noauto,owner,kudzu,ro 0 0
/dev/cdrom1 /mnt/cdrom1 iso9660 noauto,owner,kudzu,ro 0 0

zLinuxz,
Are you getting the same errors you were getting when you posted this thread ?
...... just kidding :p

(For those you want to understand this joke, refer to this thread.
http://www.linuxquestions.org/questi...threadid=84028
)

I had a similar problem where my two NICs were switched when I recompiled my kernel.
Perhaps something similar occurred with your CD-ROMs.

Did you check the /dev/cdrom and the /dev/cdrom1 soft links to make sure they point to the correct devices.

hey, hehhe,
yes, I did, and I even tried mounting them directly from /dev to /mnt, and still I get the Can't read SuperBlock error....it's frustating, :(

zLinuxz

i have pretty much no expertise with scsi so i'll end my contribution to this thread with this silly question: have you tried other cd's in the drive, cos it could be scratched cd?

Hmm... Try it by not using the symlinks...

Find out if the cdrom drive is hdc, hdd, hde, whatever...

mount -t iso9660 /dev/hdc /mnt/cdrom

Are you getting specifically, "can't read superblock"
or is it the usual
"bad superblock, too many filesystems mounted, or wrong filesystem" etc... ?

You're sure the drive is OK, right? If not, try booting from a bootable cd and see what happens.

-Shade

I'm trying to mount my DVD drive to /dvdrom. I tried the commands prescribed to zLinuxz. Here is the error message I get:

Code:

bash-3.1# mkdir /dvdrom

bash-3.1# mount -t iso9660 /dev/hdc /dvdrom

mount: block device /dev/hdc is write-protected, mounting read-only

mount: wrong fs type, bad option, bad superblock on /dev/hdc,

      missing codepage or helper program, or other error

      In some cases useful info is found in syslog - try

      dmesg | tail  or so

And here is dmesg |tail as the above error message suggests:

Code:

bash-3.1# dmesg | tail

hdc: command error: status=0x51 { DriveReady SeekComplete Error }

hdc: command error: error=0x54 { AbortedCommand LastFailedSense=0x05 }

ide: failed opcode was: unknown

ATAPI device hdc:

  Error: Illegal request -- (Sense key=0x05)

  Illegal mode for this track or incompatible medium -- (asc=0x64, ascq=0x00)

  The failed "Read 10" packet command was: 

  "28 00 00 00 00 10 00 00 01 00 00 00 00 00 00 00 "

end_request: I/O error, dev hdc, sector 64

isofs_fill_super: bread failed, dev=hdc, iso_blknum=16, block=16

bash-3.1# exit

exit

bash-3.1$

Here is my fstab:

Code:

/dev/hda5        swap            swap        defaults        0  0

/dev/hda1        /                ext3        defaults        1  1

/dev/hdb1        /home/ntfs      ntfs-3g    umask=000        1  0

/dev/cdrom      /mnt/cdrom      auto        noauto,owner,ro  0  0

/dev/fd0        /mnt/floppy      auto        noauto,owner    0  0

devpts          /dev/pts        devpts      gid=5,mode=620  0  0

proc            /proc            proc        defaults        0  0

tmpfs            /dev/shm        tmpfs      defaults        0  0

Here are the contents of /mnt/cdrom:

Code:

bash-3.1# cd /mnt/cdrom

bash-3.1# ls

bash-3.1# exit 

exit

bash-3.1$

Here is mount if interested:

Code:

bash-3.1# mount

/dev/hda1 on / type ext3 (rw)

proc on /proc type proc (rw)

sysfs on /sys type sysfs (rw)

usbfs on /proc/bus/usb type usbfs (rw)

/dev/hdb1 on /home/ntfs type fuseblk (rw,nosuid,nodev,noatime,allow_other,blksize=4096)

tmpfs on /dev/shm type tmpfs (rw)

bash-3.1#

I installed a new PSU, which means I was playing with the power cord connected to the DVD rom bay, however the bay opens and closes easily, allowing me to insert and audio disk.

I am btw running Slackware 12.1 stock kernel.