Check www.pgpi.org

I'm ben using version 7.0. The documentation bundled with the software tells me:

NOTE: Commercial data recovery companies have been known to
recover data that has been over written up to 9 times. PGP uses
highly sophisticated patterns during each wipe to ensure that your
sensitive data cannot be recovered.

I may just admit that the data is not "mission critical" (it's not really), has been made "secure," format the partition and get back to work.

Thanks for everybody's help!