[after HDD install]kernel panic if I remove the CD drive

[Burps]

Hi

I just setup a Knoppix 4.0.2 on mu computer, on the SATA HD, with an IDE CD drive.
Everything boots fine, but as I want to remove the CD drive, to use it on an other machine, I can't boot anymore !! It makes a kernel panic, with this kind of eror message :

..........
ACPI: PCI Interrupt 0000:02:01.0[A] -> GSI 18 (level, low) -> IRQ 18
e1000: eth0: e1000_probe: Intel PRO/1000 network Connection
FATAL : Module sd_mod not found.
umount: devfs: not mounted
pivot_root: No such fil or directory
/sbin/init: 432: cannot open /dev/console: No such file
Kernel panic - not syncing: Attempted to kill init!

The HD is partitioned this way :
-sda1 = swap 1 Gb
-sda2 = / 10 Gb
-sda3 = /home 10 Gb
-sda4 --> extended, shared into 3 parts

My grub menu looks like this (just FYI, as on other forums they directed me this way..):

title           Debian GNU/Linux, kernel 2.6.12 Default
root            (hd0,1)
kernel          /boot/vmlinuz root=/dev/sda2 ro ramdisk_size=100000 lang=us apm=power-off nomce vga=791
initrd          /boot/initrd.img
savedefault
boot

If i plug back a CD drive, it boots again

Any idea ?

[Burps]

and to complete this post : I had exactly the SAME hardware, with a Knoppix 3.7 HD-install : I also removed the CD Drive, and it happened quite the same thing :
/sbin/init 426....
kernel panic...

any suggestion ?