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1. #Partition option greyed out mac sierra for usb mac os
2. #Partition option greyed out mac sierra for usb install
3. #Partition option greyed out mac sierra for usb software
4. #Partition option greyed out mac sierra for usb windows 8.1
5. #Partition option greyed out mac sierra for usb trial

Follow the steps.ĩ –At some point BootCamp drivers should start to install automatically. Select the disk that says EFI boot (this is the FAT32 USB stick)Ĩ–The iMac should start into a Windows setup/ install screen.

#Partition option greyed out mac sierra for usb mac os

(versions for earlier Mac OS like Mountain Lion are still available there)Ĥ–Run UNetbootin and burn the Windows install ISO image to the FAT32 USB disk.ĥ - In Disk Utility program found on the iMac, partition the Mac hard drive adding a MS DOS partition (bigger than 2TB is fine)Ħ–With the FAT32 USB still in its slot, turn off, then turn on the iMac.Īs it starts up hold down the OPTION key (The ALT key if using standard keyboard).ħ–Startup disks should display, among them: Macintosh, Windows and EFI

#Partition option greyed out mac sierra for usb software

Since nuances can occur that are not covered in this outline, please refer to it and other sites searching “install Windows Manually without Bootcamp” for further details.ġ–Delete the software from the FAT32 USB disk that was created from the Bootcamp Assistance creation processĢ– Use Bootcamp Assistant to download ONLY the Windows Support Software to the FAT32 USB stick. Much of the information is obtained from this website:

#Partition option greyed out mac sierra for usb windows 8.1

WHAT WORKED in getting Bootcamp with Windows 8.1 installed on my OWC 2013 Imac was installing Windows manually:

#Partition option greyed out mac sierra for usb trial

Either:Ī-The third option, Install Windows 7 or Higher, in Bootcamp Assistant, was unselectable (“The startup disk cannot be partitioned or restored to a single partition.)ī– fiddling with partition sizes DID allow partitioning access in Bootcamp Assistant, but during actual partitioning process, the progress bar got stuck at about 25% and NEVER moved ahead.įYI this partitioning process should take no more than a minute or two.Īfter much trial and error that I shall not detail here.

The startup disk must be formatted as a single Mac OS Extended (Journaled) volume or already partitioned by Boot Camp Assistant for installing Windows.” The Solution “The startup disk cannot be partitioned or restored to a single partition. The end result will be an error message (also seen in the image below) that states: The root cause of the problem is that the Boot Camp Assistant uses the FAT32 format when setting up a Windows disk. My mishap of the wrong OS install is easily trumped by the fact that you can't erase a second partition on the HD.Mac owners using disks that exceed 2.2TB may find it difficult to set up a Windows disk using Apple’s Boot Camp assistant. It's more ridiculous that the Mac Book didn't come with a disk or flash drive with the software already on it (As the previous devices have). Using an external Hard Drive because I didn't happen to have a flash drive isn't all that ridiculous. B oot Camp assistance shows: "The startup disk cannot be partitioned or restored to a single partition" It was the very first thing I tried (As it has worked for me in previous OS X versions).

And always confirm what you're installing before you do it. An external hard drive (assuming it's an actual hard drive and not just a flash drive) is a lot of effort just to store under 500MB of drivers. You don't use Disk Utility to remove your Boot Camp partition, you use Boot Camp Assistant to remove it and create a new one.Īlso, I'd like to point out that the error you received is the least ridiculous part about the post.