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Best way to securely erase flash drives

Hi Experts,

What's everyones favorite way to securely erase flash drives?  We usually use eraser for normal hdds. What do you use and how many passes do you recommend?

We realize that flash drives life may decrease significantly by these methods, but that's fine. The concern is getting confidential data off when a user want to dispose of or reuse a flash drive that was once used for sensitive data.

Thanks!
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Plantwiz
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Dod standard is a three pass method, but here is a tool that lists several 'standards'

http://www.deletefilespermanently.com/help/Using/WipingSchemes.html

And after your device is wiped, you could physically destroy...though that may be too far
And some free options:

http://www.techsupportalert.com/best-free-secure-erase-utility.htm


However, the above has a 15 day trial and if you need a tool long-term, the deletefilespermanently seems to have a good variety of options.
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Thx!