Null unused/available hard drive space

Can someone tell me how to place null values in unused/available hard drive space.

These areas contain files and data which had previously been deleted.  However,
I want to null these remaining files and data so that they can not be recovered
or 'undeleted'.  

Is there a way to do this ?  Or an application on the market that will do that for me ?

Thanks !   Dan R.
danhrmrAsked:
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Dan CraciunIT ConsultantCommented:
The most popular is CCleaner. You have an option called "Wipe free space".
You can set it up to do a "normal" delete or a "secure" delete with a configurable number of overwrites.

If you want to delete a whole HDD, DBAN is another popular option.

HTH,
Dan
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nobusCommented:
BCWipe is the software designed just for that :  https://www.jetico.com/products/personal-privacy/bcwipe
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