Select Reinstall OS X and click on the Continue button. Quit Disk Utility and return to the Utility Menu. If the Security Options button is not available, Disk Utility cannot perform a secure erase on the storage device. Set the Format type to APFS (SSDs only) or Mac OS Extended (Journaled.) Click on the Apply button, then click on the Done button when it activates. 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. Ĭlick the Scheme pop-up menu, then choose GUID Partition Map. But I think its just wiser to get to Sierra as being the best OS for these older MacBook Pro’s which have SATA drives and APFS has issues with SATA (HDD or SSD) Here’s the image file for Sierra How to upgrade to macOS Sierra Jump to Step 4 for the direct link. 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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