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How to 100% format all my drives?

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Charles Bundy

HPA aren't theory, Seagate, WD, et-al use them. :) See -

Malware would just need to use the ATA4 command extensions to set/access them. It wouldn't wreck the drive, but you might be scratching your head as to why you suddenly lost HD storage capacity.

I bad guy could use the HPA to store both code and data that would survive a low level format/wipe, unless a tech used Seagate or WD tools to remove the HPA.