I installed Knoppix-3.4 to hatd-disk, install with lilo (default) boot works.

I want to try grub boot and have problems getting the kernel options right:

title knoppix-3.4
kernel (hd0,2)/boot/vmlinuz-2.6.5 ramdisk=100000 lang=us apm=power-off atapicd nomce\
ro root=/dev/hda3
module (hd0,2)/boot/initrd.img-2.6.5

which are same (as in lilo.conf) except for ro root=/dev/hda3

The boot messages..
RAMDISK: incomplete write (-28 != 3276 4194304
EXT2-fs:hda3: couldn't mount beacause of unsupported optional feaures(4)
Kernel panic:VFS: Unable to mount root fs on /dev/hda3
(hangs here)

Any ideas?