Pretty secure. IIRC the DOD standard for a secure data wipe is fulfilled by a triple pass.
That said, if someone has limitless resources, the only way to be 100% sure is by slagging the drive. I promise you though, your facebook password, naked pictures of your wife and all your banking information isn't worth the time.
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"Wake up, Luigi! The only time plumbers sleep on the job is when we're working by the hour."
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