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Do I need a disk to reinstall OS X?
You Have a Fresh Install of OS X. You should now have a fresh copy of Mac OS X installed, and your computer is back to its factory settings. All without the need for a recovery disc or thumb drive.
How do I reinstall OS X without a disk?
Reinstall Your Mac’s OS Without an Installation Disc
- Turn your Mac on, while holding the CMD + R keys down.
- Select “Disk Utility” and click on Continue.
- Select the startup disk and go to the Erase Tab.
- Select the Mac OS Extended (Journaled), give a name to your disk and click on Erase.
- Disk Utility > Quit Disk Utility.
How do I remove old OS X Installer?
If you only want to delete the installer, you can select it from the Trash, then right-click the icon to reveal the Delete Immediately… option for just that file. Alternatively, your Mac can delete the macOS installer on its own if it determines that your hard drive doesn’t have enough free space.
Is there a way to reinstall OS X after erase?
If the newer OS X version is blocking you from using the Install Disc, then you will need to startup in Recovery and use Disk Utility to erase the drive. see > How to reinstall macOS – Apple Support You need to install the original OS X that is on the install disc and let the new owner update with their Apple id.
Is the OS X installer mounted on the disk?
If so you will need to revert the drive before Disk Utility can manage your partitions for you again. To see: Click to expand… No, it’s a standard partition or rather a mounted Apple Disk image according to DU. It’s like the installer put a stub file/partition/image somewhere, and it gets mounted on startup.
How do you install OS X on a Mac?
Install macOS or OS X from Internet Recovery Mode, which you can boot into by holding option+command+R while your Mac powers up. Download the relevant macOS or OS X installer from Apple, then use Terminal to create a USB installer you can boot up from. Or use the OS X installation disc that came with your machine — or buy a new one — to boot up
What should I do if my OS X installer failed?
If you were trying to reinstall the macOS system, and that failed, you can try another install. Just boot to your installer drive, and try again. Be sure that other storage drives are not attached. That can help. You must log in or register to reply here.