![]() If you want your Mac to start up again from the volume you just you erased, select Reinstall macOS in the utilities window, then click Continue and follow the onscreen instructions. If you are definitely going to use an external drive or flash drive with both Windows and Mac computers, choose exFAT when formatting your drive. ![]() When done, quit Disk Utility to return to the utilities window.Click the Erase button, Disk Utility will start formatting the drive. WARNING: Formatting the drive will erase all data on the drive, so you should copy any data you want off the drive prior to formatting. b) Click on Erase to format the new hard disk. Set Format to Mac OS Extended (Journaled) Set Scheme to GUID Partition Map. Optional: If you previously used Disk Utility to add internal volumes other than Macintosh HD, you can erase them individually using the same process. a) Startup your Mac and press the Option+ + R keys to boot into Recovery.If this button isn't shown, click Erase instead. Format: APFS or Mac OS Extended (Journaled), as recommended by Disk Utility.Click the Erase button in the toolbar, then enter the requested details: To completely remove all of your information from the hard drive and reinstall MacOS, open Disk Utility and then select the internal disk, which is labeled Macintosh HD.Select Macintosh HD in the sidebar of Disk Utility.Step 4: Open Disk Utility Double-click on Disk Utility and a menu will pop up. From the utilities window, select Disk Utility and click Continue. Step 3: Press CMD+R The second you see a grey screen, hold the CMD and R keys down for about 15 seconds, then let go and you'll be taken to OS X Utilities recovery.If asked, select a user you know the password for, then enter their administrator password.You will be prompted to choose an Internet connection type. 3 Release the Command + R keys when the Apple logo displays on-screen. 2 Press and hold the Command + R keys on your keyboard immediately after hearing the startup sound. Start up from macOS Recovery: Turn on your Mac, then immediately press and hold these two keys until you see an Apple logo or other image: Command (⌘) and R. Erasing the Drive and Installing OS X Download Article 1 Power on your Macbook Pro and listen for the startup sound.
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