sanitizing disc

[Gary Kirkpatrick]

I have ubuntu 13.10 installed on an external harddrive which I have been
using so it has my files on it.  I am going to give the drive to a friend.
What is the best way to remove my files from the drive?  I could just
reinstall ubuntu but short of that is there anything I can do to sanitize
the disk?  How about make another user and delete my original user?


thanks


garyk

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