what is Zero out deleted database pages?

What is the function of Zero Out Deleted database pages? When create a new storage group in Exchange 2003.
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When an item is deleted (such as a mailbox, folder, message) from the
Exchange database, the database pages are simply marked as unused. Page
zeroing is a more secure way of deleting - it overwrites the database pages
occupied by deleted items using specified character. Page zeroing occurs
during Exchange backups (if configured), and as one can image - it takes
more resources.

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ITS-ADMINAuthor Commented:
Awesome.  Thank you for the quick response.
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