the only way to be sure is to destroy the drive.
hdds - punch out the plates and shred.
ssds - shred and verify that the memory modules and controller are completed destroyed, if questionable, burn.
microfiche - burn
reel to reel tape - burn
tape - shred, verify if questionable burn
hdds - punch out the plates and shred.
ssds - shred and verify that the memory modules and controller are completed destroyed, if questionable, burn.
microfiche - burn
reel to reel tape - burn
tape - shred, verify if questionable burn

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