Before selling my late 2015 27″ iMac Retina 5K I wanted to secure erase its 1TB Fusion Drive consisting of a 24GB SSD and 1TB HDD. Secure erasing an HDD is simple enough using the Security Options in Disk Utility, but for Fusion Drives and SSDs this option is not available. To secure erase the iMac’s HDD I first needed to break the Fusion Drive into its constituent parts using Terminal.
Secure Erasing a Mac Fusion Drive
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