For security reasons I want to wipe the unused disk space on my storage media. How do I do that? In other words, I want my unused disk space to be replaced with zeroes.
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There are a ton of ways to do this sort of thing, and a pretty good start is already located here. I'd say pick the method that suits your needs best. – KGIII Nov 06 '20 at 20:37
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Please add hardware (disk) info - HDD / SSD? – Vlastimil Burián Nov 06 '20 at 20:38
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1Duplicate of https://unix.stackexchange.com/questions/44234/clear-unused-space-with-zeros-ext3-ext4/44236#44236 ? – Jeff Schaller Nov 06 '20 at 20:55
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1Also https://unix.stackexchange.com/q/44725/117549 for btrfs – Jeff Schaller Nov 06 '20 at 20:57
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You're right. What would be the best method for a SSD though? – Sir Muffington Nov 07 '20 at 11:48
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Does this answer your question? Clear unused space with zeros (ext3,ext4) – AdminBee Nov 13 '20 at 09:36
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You can use the Unix utility called zerofree to do exactly that.
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