Exist any software to write bad sectors intentionaly ?
No, but there’s a hardware method - pulling the plug whilst the HDD is doing some writing.
Open the hard drive and use a knife
hehe of course but I MEAN in RW+CD
For CD-R(W) you can make a weak sector files using this tool, if you then add it to your CD compilation with Nero (or any burning software) and then burn the disk you make will have weak sectors on it. Not effective as a protection anymore mind, almost any read software can bypass them now.