A reader preparing their Mac for sale has a well-meaning friend erase the startup volume. My recollection is that Recovery looks for the current OS system installer on your startup disk in the.
With a FileVault-encrypted startup disk, you can restart into OS X Recovery and launch Disk Utility to erase the volume. However, before erasing, you need to select the disk and then choose File. Show All Devices and Erase the Parent Drive. By default, Disk Utility only shows the Volumes on your. You can erase a disk or volume at any time, including in circumstances such as these: You want to quickly and permanently erase all content from your Mac and restore it to factory settings, such as when you're selling, giving away, or trading in your Mac.; You're changing the format of a disk, such as from a PC format (FAT, ExFAT, or NTFS) to a Mac format (APFS or Mac OS Extended).
I don't know exactly which model you have, but you can do a Network Restore provided your model is from Late-2011 or later. Below are the steps to reinstall a clean copy of OS X after erasing the disk. However, before you do this you could just try repairing the disk.
Clean Install of Sierra or El Capitan on a Clean Disk
- Restart the computer. Immediately after the chime hold down the Command-Option-Rkeys until a globe appears.
- The Utility Menu will appear in from 5-20 minutes. Be patient.
- Select Disk Utility and click on the Continue button.
- When Disk Utility loads select the drive (usually, the out-dented entry) from the side list.
- Click on the Erase tab in Disk Utility's main window. A panel will drop down.
- Set the partition scheme to GUID.
- Set the Format type to Mac OS Extended (Journaled.)
- Click on the Apply button, then click on the Done button when it activates.
- Quit Disk Utility and return to the Utility Menu.
- Select Reinstall OS X and click on the Continue button.
Unable To Erase Disk Mac
S3 browser for mac. This should install the version of OS X that was pre-installed when the computer was new.
Repair the Drive for Sierra and El Capitan
Cannot Erase Disk Mac
Can't Erase Disk On Mac
- Restart the computer and after the chime hold down the Command and R keys until the Utility Menu appears.
- Select Disk Utility and press the Continue button.
- Then select the indented (usually, Macintosh HD) volume entry from the side list.
- Click on the First Aid tab in the toolbar and wait for the Done button to activate. Click on it, then quit Disk Utility.
- Select Restart from the Apple menu.