![]() ![]() If you have a rotating hard disk, you can use a package manager, such as Home Brew, MacPorts, or Fink to install an open source 'srm' package, or you can search for an App that claims to do secure erase. On a rotating disk drive, as long as none of the blocks became a bad block, secure erase would wipe the file. Using Secure Erase on an SSD never deletes the data you want, and shortens the life of your SSD. Then when you reformat your storage, the encryption key will be thrown away, and all the encrypted data is just a bunch of random bits.Įncrypting after the fact, means that any bad blocks will have readable data with the right tools, any SSD's with block that have not been pre-cleaned will be readable with the correct tools.īasically if you have a SSD and did not keep the SSD always encrypted, then you will expose some portion of your personal data to anyone with the correct tools when you sell your Mac.Īs for the old Secure Erase of individual files, that is no-longer a Finder option as of El Capitan, and no longer an 'srm' command via Terminal in Sierra. Then all your data is encrypted, including any bad blocks, or on SSD's the blocks that have not been pre-cleaned. ![]() You should use FileVault from the first day you purchase your Mac. ![]()
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