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With the exception of destroying the drive the only way to stop anyonefrom gaining access to your data is to put the drive in a drawer and not give it to anyone!
To destroy the data on the drive to make it really difficult to recover will take several days leaving a piece of software runing that will write over and over and over to the disk surface burying the old data with new useless data. If you've got a PC and a week to spare, give it a try. Then try for a couple of weeks to see if any data can be recovered or not.
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