Share your knowledge at the LQ Wiki.
Go Back > Forums > Linux Forums > Linux - Distributions > Red Hat
User Name
Red Hat This forum is for the discussion of Red Hat Linux.


  Search this Thread
Old 07-04-2007, 04:41 PM   #1
LQ Newbie
Registered: May 2007
Posts: 1

Rep: Reputation: 0
Unhappy CDROM can't read/can't read superblock

I just installed Red Hat Linux version 2.6.9-5.EL,I am trying to install oracle database on it.

On inserting the cd and trying to mount I got the following :

[root@unknown-00-a1-b0-a3-57-0f media]# mount cdrom
/dev/hdd: Input/output error
mount: block device /dev/hdd is write-protected, mounting read-only
/dev/hdd: Input/output error
mount: /dev/hdd: can't read superblock

I tried the same CDs on other OSs and it is not corupted .Also, I tried different CD on I always got the same error

Can anyone help?
Old 07-05-2007, 03:29 AM   #2
Senior Member
Registered: Dec 2005
Location: Indiana
Distribution: RHEL/CentOS/SL 5 i386 and x86_64 pata for IDE in use
Posts: 4,790

Rep: Reputation: 57
First it is Red Hat Enterprise Linux 4 (or RHEL4) with kernel 2.6.9-5.EL..........not a big issue but one should know the difference.

Second the kernel is way out dated, as soon as possible update the the current released versio of the kernel and other packages, RHEL4update5 is now available.

# mount cdrom
/dev/hdd: Input/output error
mount: block device /dev/hdd is write-protected, mounting read-only
/dev/hdd: Input/output error
mount: /dev/hdd: can't read superblock
The first part of the error (mounting read-only) is normal and expected, nothing to worry about here. The second part ( can't read superblock) is not normal, it sound like maybe an IRQ or DMA issue with the hardware device (the cdrom or /dev/hdd). It can also be an issue with the /etc/fstab entry for the device, please check for both. First the easy one the /etc/fstab file, a sample line entry is below for the device;

/dev/cdrom              /media/cdrecorder       auto    noauto,users,ro 0 0
The second (IRQ or DMA issues) involves reviewing the /var/log/messages file for possible errors. After attempting to mount the CD take a look at the tail end of the file as root;

cat /var/log/messages

The media should automatically mount the media when inserted, since it does not seem to be doing this also check if autofs is installed; rpm -qa autofs


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
I get mount: /dev/cdrom: can't read superblock, How to fix? zLinuxz Linux - General 12 06-18-2008 02:42 AM
mount: /dev/cdrom: can't read superblock raynmune Linux - Hardware 7 07-09-2005 04:02 PM
Superblock could not be read captainfreedom Linux - Newbie 2 03-02-2005 02:09 PM
Superblock could not be read zatka Red Hat 12 01-27-2004 04:22 AM
can't read superblock - new kernel jamesstaylor Linux - Newbie 3 09-29-2003 11:01 AM > Forums > Linux Forums > Linux - Distributions > Red Hat

All times are GMT -5. The time now is 07:51 PM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration