Not quite that easy.  The directory entries are hardware keyed.  I believe 
the key must also be 8X'FF'.

IBM Mainframe Discussion List <[email protected]> wrote on 02/22/2006 
12:39:05 PM:

> You could write 255 bytes of hex FF to the first directory block. That
> in essence will make all the members inaccessible.
> 
> Mark Jacobs
> Time Customer Service Inc.
> Tampa, FL



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