Knoppix 3.8.1 is installed on my hard drive.
I tried to defrag my partition with e2defrag from the Knoppix CD.
Thinks looked running well.
But now I am unable to boot again from the hard drive.
When I try to restore lilo from the Knoppix CD I get a message saying the hard drive is protected against writing.
How to proceed for the boot restoration?

I tried to follow the procedure #52 described in the O'Reilly book "Knoppix at 200%".
But remounting the hd is rejected because of the writing protection.