Erase free disk space on mac

Contents

  1. Securely erase free space from Terminal
  2. Erase Free Disk Space on Mac | Super Eraser for Mac
  3. Easily Erase Free Disk Space on Mac
  4. Free Mac Disk Space Data Erasure Software
How to Use Disk Utility in macOS Mojave to format,erase, partition external hdd

Viewed 8k times. Simon Simon 3, 20 20 gold badges 51 51 silver badges 79 79 bronze badges. Do you have a SSD or a hard disk? Alternatively you could enable FileVault 2 on your drive which makes it significantly more difficult for the casual attacker to recover deleted files.

Excerpt: srm removes each specified file by overwriting, renaming, and truncating it before unlinking.

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Securely erase free space from Terminal

You can use -s for a single pass of random data which should be secure enough in practice or -m for 7 passes of data. The asker did note he had a hard disk in comments, but it should be added that srm is likely not suitable for SSD use.

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Rewriting on an SSD generally results in the old data being "hidden" and a new sector being written and moved into its place. Eventually, it may resurface and be rewritten with new data, but depending on your attacker's resources, it may not be enough. I promote the Lauri answer for 2 reasons. The pass was necessary for old disks and in a situation where the recovery is started immediately after the erasing.

In real life, after a single pass 2 things happen. The freed and erased space is overwritten by the OS.


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No one is able to recover where the erased data was, because there are erased area all over the disk surface and nothing look more like an erased area than the next one. Lri Lri SSDs and Hard disks are totally different here.

Erase Free Disk Space on Mac | Super Eraser for Mac

From time to time, I need to clean off the contents of a hard drive on one of my Macs—most often this is the case prior to selling the mac or giving it to someone else. Instead of just formatting the drive, installing macOS, then handing it off, I want to make sure all the contents I had stored on it are irrecoverably erased I sometimes work on projects under NDA, and I also like having some semblance of privacy in general.

Disk Utility used to expose this functionality in the UI, which made this a very simple operation. But it seems to have gone missing in recent macOS versions. Luckily, it's still available on the command line via Terminal. This command would write zeroes on the entire 'Macintosh HD' drive.

Easily Erase Free Disk Space on Mac

There are a few other common options available instead of 0 if you run man diskutil and scroll down to the secureErase section. I most commonly use:. Paragon Disk Wiper for Mac allows to create a bootable USB-flash drive or external hard drive that will help you to completely erase a whole hard disk, a separate partition or just clean free space. After booting your Mac with the bootable media you will be able to use Wipe Wizard to irreversibly remove your confidential data.

Free Mac Disk Space Data Erasure Software

Paragon Disk Wiper for Mac supports all Intel-based Macs, providing the possibility to quickly and efficiently sanitize the hard disks in order to protect valuable business information and also because there is, in the most countries, a legal obligation to do so. Irreversibly destroy all on-disk data in compliance with major national government and military data erasure standards, as well as the most comprehensive academic wipe algorithms, thus providing maximum level of security US DoD Create your own wipe algorithm with minimal effort — define up to 4 wiping patterns, number of passes for each wiping pattern and for the group of patterns, thus resulting in over possible number of passes.

Be well-informed about the results of the wipe operation to verify when wipe operations have been successfully accomplished. Enjoy support of a wider range of hardware configurations with the option to add drivers for specific hardware on-the-fly.


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