Can't mount cdrom on hdinstall

[JrBobDobbs]

Hi,
I'm a bit of a linux n00b running knoppix 3.4 hdinstalled onto a Dell Inspiron 1100. When I try to mount my cdrom drive, I get this error:
root@laptop:/# mount /dev/cdrom
mount: special device /dev/cdrom does not exist

I'll post the output from /etc/fstab:
root@laptop:/# cat /etc/fstab
# /etc/fstab: filesystem table.
#
# filesystem mountpoint type options dump pass
/dev/hdc5 / ext3 defaults,errors=remount-ro 0 1

proc /proc proc defaults 0 0
/dev/fd0 /floppy vfat defaults,user,noauto,showexec,umask=022 0 0
usbdevfs /proc/bus/usb usbdevfs defaults 0 0
sysfs /sys sysfs defaults 0 0
/dev/dvd /dvd iso9660 defaults,ro,user,noexec,noauto 0 0
/dev/cdaudio /cdaudio iso9660 defaults,ro,user,noexec,noauto 0 0
# Added by KNOPPIX
/dev/hdc1 /mnt/hdc1 vfat noauto,users,exec,umask=000 0 0
# Added by KNOPPIX
/dev/hdc2 /mnt/hdc2 ntfs noauto,users,exec,ro,umask=000 0 0
# Added by KNOPPIX
/dev/hdc6 none swap defaults 0 0

/dev/cdrom /cdrom iso9660 defaults,ro,user,noexec,noauto



Anyone have any ideas?
Thanks,

[JrBobDobbs]

I see a bunch of views but no replies
Could someone perhaps point me in the right direction to find the answer to my problems?


Thanks!

[mzilikazi]

Well here's the deal. /dev/cdrom is a symlink to the actual device. Why use a symlink? So that all apps can look for the same drive no matter where or what type it really is. With kernels older than 2.6.* you need scsi emulation so the drive will apear on the SCSI bus as a SCSI device.

An external USB cdrom, kernel 2.5.25:

ls -al /dev/cdrom
lrwxrwxrwx    1 root     root            8 Apr 22 16:09 /dev/cdrom -> /dev/sr0

Internal cdrom, kernel 2.4.25

 ls -al /dev/cdrom
lrwxrwxrwx    1 root     root            9 Mar 26 05:51 /dev/cdrom -> /dev/scd0

An internal cdrom, kernel 2.6.5:

ls -al /dev/cdrom
lrwxr-xr-x    1 root     root            8 May 10 00:48 /dev/cdrom0 -> /dev/hdb

SO you just have to create the link.

ln -s /dev/sr0 /dev/cdrom

OR

ln -s /dev/scd0 /dev/cdrom

OR

ln -s /dev/hdb /dev/cdrom

Don't know which drive is your cdrom drive? No problem.

For kernel 2.4.*

cdrecord -scanbus

For 2.6.* kernel:

dmesg|grep CD

If you make a symlink that's no good you can just remove it like so:

rm -f /dev/cdrom

HTH

[Romkillah]

Just check this out for an easy way of making it all happen, just look at my most recent post, and use the first one for reference to where the lines go...
http://tlug.dnho.net/node.php?id=91

[koma]

if it's anything like my install you may need to use mount /dev/sr0 /mnt/cdrom

try entering in terminal window: dmesg

this should list all of the ongoings during your startup sequence.. take a look in there to find out what it used to reference your cdrom drive..

then maybe you need to update /etc/fstab and change the /dev/cdrom to /dev/sr0

I'm a noob myself but this worked for me..

gl!