Quickest and easiest: Drill about 3 holes through the entire drive in the platter area. Nobody this side of an NSA type organization will be able to make any sense of it whatsoever.
If they're easily installed in a computer - AND - you want someone to be able to reuse them but remain secure, use one of the many "secure erase" utilities - some BIOSes have them built in nowadays.
If they're easily installed in a computer - AND - you want someone to be able to reuse them but remain secure, use one of the many "secure erase" utilities - some BIOSes have them built in nowadays.



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