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Do I really have to use secure erase
(sopuli.xyz)
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this post was submitted on 19 Aug 2026
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Thing seems to be though, that OP did not use LUKS consistently, but mixed with unencrypted uses.
In this case, fast, file-oriented secure-erase (or just throwing away all the LUKS headers, if the remaining partition was encrypted) might miss the remnants of old unencrypted uses.
So, specifically in OPs case, I am not sure if there is another safe option than a full-device overwrite e.g. using dd.
...if you follow it up with a secure discard of all of the remaining blocks.