![]() srm has been removed from homebrew-dupes and homebrew-core but someone's published a tap here that works (ie.brew install coreutils & gshred secrets.txt) Use rm -P which overwrites files with 0xff, then 0x00, and then 0xff again.If, by stroke of misfortune, you're on a magnetic medium, have journalling disabled and, for some reason, can't encrypt the disk, you're options are: These days, the best way to securely "deleted" files is to enable FileVault (so they're never write disk unencrypted in the first place) then just delete them and let TRIM sort it out. HFS Plus volumes are journaled by default since Mac OS X v10.3. Exceptions include: Log-structured or journaled file systems ![]() many modern file system designs do not satisfy this assumption. shred relies on a very important assumption: that the file system overwrites data in place. In particular, it will NOT work on the vast majority of journaled file systems. The other problem the file system, specifically journaled file systems, which can keep a copy of data elsewhere before it's written out.Įven on magnetic media this can cause problems for both srm:Īll users should be aware that srm will only work on file systems that overwrite blocks in place. This makes attempts to "over-write" a file both futile (you'll be writting to a different physical location) and undesirable (it needlessly contributes to disk wear).Īll Macs that come with an SSDs have TRIM enabled. Unlike magnetic disks, modern TRIM-enabled disks automatically clear deleted data in the background. The problem is neither srm or shred really make sense for modern systems. Answer is correct for the question posed.
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