how to wipe a hard drive without alerting the owner?

i hope this is an appropriate subreddit for my case. i have foudn out that at some point in the past my father copied all info from my personal hard drive, information including personal photos (some are just things i never wanted him to see, others are outrigth nudes and sex tapes. nothing when i was underage). i don't want him to have these, obviously. for reasons, i cannot confront him directly, nor i can just wipe the drive off …

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