![]() If the Security Options button is not available, Disk Utility cannot perform a secure erase on the storage device. Quick note: You want to do this before creating the bootable media because there is a good chance that the drive was formatted using a Windows device. Secure erase options are available only for some types of storage devices. Right-click the USB flash drive and select the Format Disk for Mac option from the left pane. ![]() (Optional) If available, click Security Options, use the slider to choose how many times to write over the erased data, then click OK. If the Scheme pop-up menu isn’t available, make sure you selected the storage device you want to erase-it’s at the top of the hierarchy.Ĭlick the Format pop-up menu, then choose a file system format. Ĭlick the Scheme pop-up menu, then choose GUID Partition Map. In the sidebar, select the storage device you want to erase, then click the Erase button. Each command assumes that the installer is in your Applications folder and MyVolume. ![]() Type or paste one of the commands below into Terminal, then press Return to enter the command. Open Terminal, which is in the Utilities folder of your Applications folder. If you want to erase any other type of storage device: Double-click Disk Utility in the /Applications/Utilities folder. Plug in the USB flash drive or other volume that youre using for the bootable installer. Note: If you want to get your Mac ready to trade in, sell, or give away, and your computer is a Mac with Apple silicon or an Intel-based Mac with an Apple T2 Security Chip, use Erase Assistant.
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