I added a 40 GB hard disk to my SUSE box. Now when I try to mount a CD using mount -t iso9660 /dev/cdrom /cdrom I get a message "mount: no medium found".

The light on the CD drive comes on during this exercise, and the bios shows it (ATAPI). I have also tried this with several CDs, some of which I used successfully prior to installing the new drive. Anybody seen this before?

have u changed the CD from master to slave? if thats so the device changed position under /dev, I think
"cat /proc/devices or cat /proc/mounts" should show it.

Hmmm.

This is new territory. When I cat /proc/mounts I see the current mounts as follows:
/dev/root / ext2 rw 0 0
proc /proc proc rw 0 0
/dev/hdb1 /d01 ext2 rw 0 0
/dev/hda1 /boot ext2 rw 0 0
devpts /devpts devpts rw 0 0
usbdevfs /proc/bus/usb usbdevfs rw 0 0

The fstab looks like this:
/dev/hda2 swap ext2 defaults 0 0
/dev/hda3 / ext2 defaults 1 1
/dev/hdb1 /d01 ext2 defaults 1 2
/dev/hda1 /boot ext2 defaults 1 2
/dev/hdc /cdrom auto ro,noauto,user,exec 0 0
/dev/fd0 /floppy auto noauto,user 0 0

The block devices reported by cat /proc/devices are:
1 ramdisk
2 fd
3 ide0
7 loop
9 md
22 ide1
58 lvm

Okay, armed with all this info, how do I determine whether the CD has been changed from master to slave?

Ok, its detected, master on IDE2 & correct entry in fstab. No problems there.

Only stuff I know u could further test on is
1) no cd inserted (u already checked that)
2) wiring & master/slave pins on the CDR (but its recognized) or
3) faulty CDR.

The only thing I know to test a CDR then would be a "raw" read & write from the device (dd infile, outfile) like:
"dd if=/dev/hdc of=/tmp/testread.img"
This would bypass mount, any filesystem options etc.
*Better kill that after a few megs if it reads ok.
If this works the problem isnt the device.

I hope someone else will also shed a light on this one..

Further investigation revealed incorrect hard disk jumper settings. Adjusted jumper and it works.