How to Secure Erase Disks on MacOS Tahoe & Sequoia

Whether you’re preparing to sell, recycle, or repurpose a Mac, or you’re going through old hard drives and storage disks that you wish to clear all data from, securely erasing the drive is an important step. Simply deleting files or formatting a disk isn’t always enough, especially for hard drives and external storage, since data can sometimes be recovered with recovery and forensic tools. The last thing you want is to discard an old hard drive with some important data or private information on it, and then have that data be recovered and used for nefarious purposes. Securely erasing disks and hard drives is particularly important for many professions that work with a lot of private personal data, like as is common in human resources, payroll, medicine, healthcare, CPA, or financial advising.
On modern Macs, including with MacOS Tahoe and Sequoia, the options to secure erase a drive or disk can be a bit more nuanced than they once were. Sure, sometimes you can simply connect a drive to the Mac and use Disk Utility to secure erase, but you might also find that the familiar “Security Options” settings in Disk Utility are not always available, depending on the type of storage device that is in use. This has led some users to believe that secure erasing is no longer possible in MacOS with Disk Utility, but that’s not necessarily the case. While this can be confusing if you’re expecting to secure erase and overwrite a disk the traditional way, it does not mean that you cannot securely erase disks and drives anymore, but you might need to look beyond Disk Utility to achieve this objective.
We’re going to run through the steps to use secure erase for disks and drives on modern Macs, with MacOS Tahoe 26 or later, and what to do when the standard security options feature is not available within Disk Utility, so that you can perform a secure erase on the drive/disk anyway.

















