Before erasing your Mac If you want to restore your Mac to factory settings, such as to prepare it for a new owner, learn what to do before you sell, give away, or trade in your Mac.
Make a backup of any files that you want to keep. Erasing your Mac permanently deletes its files. If asked, select a user you know the password for, then enter their administrator password. From the utilities window, select Disk Utility and click Continue. Don't see Macintosh HD?
However, if you see an Erase Volume Group button, click that button instead. I had to "Unlock" the encrypted drive and then it was available. I then tried to do an Erase, and it failed with an error I didn't catch, and then only "Macintosh HD" shows up no volume below it in Disk Utility and the Erase tab is unavailable.
The Partition tab is also locked and nothing can be chosen. Posted on Aug 22, PM. The installer only shows the USB device, greyed out. This may have me running again. I will post closing comments when Disk Utility is done 0-byte formatting the entire drive. Page content loaded. Aug 22, PM. The drive is clobbered. The format that failed was enough to clobber the volume so it does not appear to Disk Utility.
The only option I know of in this situation it to use the manufacturers utility to Rewrite the drive back to factory specs. If that is even an option with these newer drives haven't had to do that in some years.
I ran in to this issue once again, when trying to clean install Mountain Lion on my MacBook. I was unable to format using the command line due to seeing the message:. Basically, you need to run diskutil CoreStorage list from Terminal. Make your selection and click the OK button to close the Security Options.
Formatting a drive is conceptually the same as erasing it. The main difference is that you select a drive, not a volume, from the list of devices. You also select the type of drive format to use. This formatting process takes a little longer than the basic erase method. Select a drive from the list of drives and volumes shown in Disk Utility.
Each drive in the list displays its capacity, manufacturer, and product name, such as Then, click the Erase tab. Enter a name for the drive. The default name is Untitled. The drive's name eventually appears on the desktop, so it's a good idea to choose something descriptive or at least more interesting than Untitled. Select a volume format to use.
The Volume Format drop-down menu lists the available drive formats that the Mac supports. Click Security Options to open a menu that displays multiple secure erase options.
Optionally, select Zero Out Data. This option is for hard drives only and should not be used with SSDs.
Zero Out Data performs a test on the hard drive as it writes zeros to the drive's platters. During the test, Disk Utility maps out any bad sections it finds on the drive's platters so they can't be used. You won't be able to store any important data on a questionable section of the hard drive. The erase process can take a fair amount of time, depending on the drive's capacity. Make your selection and click OK to close the Security Options menu.
Click the Erase button. Disk Utility can't directly erase or format a startup disk because Disk Utility and all of the system functions it uses are located on that disk. If Disk Utility tried to erase the startup disk, it would, at some point, erase itself, which would present a problem.
To get around this, use Disk Utility from a source other than the startup disk. Macs without optical drives use the Recovery volume. Restart the Mac by selecting the Restart option in the Apple menu. When the display goes blank, press and hold the C key on the keyboard. Booting from the DVD can take time. After you see the grey screen with the Apple logo in the middle, release the C key. Select Use English for the main language when this option appears and then click the arrow button.
Select Disk Utility from the Utilities menu. When Disk Utility launches, select the drive from the disks and volumes listed at the left side of the Disk Utility window. The selected drive's name and current format display in the right side of the Disk Utility workspace. Disk Utility unmounts the drive from the desktop, erases it, and then remounts it on the desktop. You can then use the steps in the Erase a Non-Startup Volume section early in this article.
This takes you back to the Install OS X window. Set the startup disk by clicking the Startup Disk button.
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