|Bad sectors need to be relocated to a special area set aside for that, but they cannot be marked as unuseable. When you have so many bad sectors that there is no longer anywhere to relocate them, the drive has to be replaced.|
Even if it was possible to mark them as unuseable, it wouldn't be practical. When you have that many bad sectors the drive has very little time left.
For what it's worth to XP users: When you click on the 'Command Prompt' you are just causing the 'Command prompt' to be displayed. This prompt gives you access to the 'NT Virtual DOS Manager'.