Permanent Eraserīy using FileVault to encrypt the drive startup drive and Disk Utility to encrypt external drives, all the data on the drive will be garbled, unless someone has the encryption key your password. Technology such as wear leveling, which tries to ensure each memory block on an SSD is used the same amount of times, can really mess with a secure erase. Some people say that the standard erasing of an SSD makes data recovery hard enough for it to be "secure. For help creating a bootable external drive, have a look at Apple's page here, or use a popular tool such as DiskMaker X.Īs you can imagine, having an external bootable drive or installer drive can come in handy. An external hard drive or thumb drive will do. Just be aware that if you want to properly erase the hard drive that is also your startup drive, you will have to start your Mac from an external media first. This works for any hard drive, internal or external. Permanently Delete Files Using Terminal Commands
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