Adding weak/bad sectors & disabling folder access


I have recently got a protected VCD in which the person has added weak/bad sectors and also and disabled access to the MPGAVI folder.
It played well on all VCD players and on the PC it did have a stand alone player come with the VCD itself.

I was keen on learning how they did it. I tried a few softwares to add weak/bad sectors but the VCD use to not play in the player.

Can you suggest me an ideal software/method for add these weak/bad sectors and also how i can go about disabling directory access.