Why would you want to create bad sectors? Bad sectors occur over time as a HD is used. Eventually some spots will no longer properly hold a positive or negative charge making them unreliable. When this occurs the HD is designed to flag that sector as bad so that it is no longer used. A few bad sectors is nothing to be concerned about but if the drive starts getting more and more bad sectors then it needs to be replaced because it is "going bad" and will likely loose your data.
How do we know its for your computer? You may want this information for spurious reason