![]() ![]() ![]() If you see a message that a disk is missing or has failed: Use the First Aid pane to repair the RAID set. If you’re using a USB disk, you may need to disconnect and reconnect it. If the Security Options button is not available, Disk Utility cannot perform a secure erase on the storage device. If a disk is missing: Make sure it’s connected to a power source, turned on, and connected to your computer. Secure erase options are available only for some types of storage devices. (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. Go to 'View' and enable advanced view (I don't remember exact wording). In 10.13 Apple has simplified Disk Utility's view so it only shows volumes (omitting physical devices). Ĭlick the Scheme pop-up menu, then choose GUID Partition Map. Disk Utility still offers this option but only if you choose 'Wipe' on physical device rather than volume (which makes perfect sense). In the sidebar, select the storage device you want to erase, then click the Erase button. If you want to erase any other type of storage device: Double-click Disk Utility in the /Applications/Utilities folder. 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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