![]() After the chime, hold down Option and when prompted to select your boot drive, select EFI Boot (or whatever else that comes up for a BIOS-CSM installation).Īfter installation, install Boot Camp drivers. Type E:\Windows\System32\bcdboot E:\Windows /s E: /f ALL (use this one for BIOS-CSM installation) Type E:\Windows\System32\bcdboot E:\Windows /s S: /f UEFI (use this one for UEFI installation) Type dism /apply-image /imagefile:C:\WIN2GO\install.wim /index:1 /applydir:E:\ (this process will take quite a while) In your C drive, create a new folder named WIN2GO. Type format fs=ntfs quick label=W2G (or any other name you wish for label) Type assign letter=S (skip if installing in BIOS-CSM) ![]() Type format quick fs=fat32 label=EFI (skip if installing in BIOS-CSM) Type create partition EFI size=100 (skip if installing in BIOS-CSM) Type convert gpt (stop at this point if you're using a drive with a Thunderbolt port) Type select disk 1 (if your disk is Disk 1) Note: All commands aren't case sensitive, including pathway to files. Install.wim file (obtain this from your Windows ISO) Any existing Windows environment will do. You must have a Windows VM in VMware/Parallels/VBox, or a Windows PC. Use this method (a bit windy but definitely works):Ĭonnect external drive to Windows VM. I'm not sure which version, I'll keep, I've been using that external drive for different operating systems, and when Redstone hits later this summer, will upgrading that be smoother on this, or the bootcamp partition (or will it matter)? I dunno, but kudos to yjchua95 to providing the steps. ![]() Odd thing, is I didn't have to activate this version, Perhaps when it phoned home, it saw that it was the same iMac (though different drive). I'll eventually google them and try to repeat. So my bootcamp partition has some nice refinements that I forgot how I did it. No matter how many times I may install windows, each time I do, the results are different, just little things I find out from one install to another, and then forget. I have a Fusion drive, so Windows is running on the spinning hard drive, as opposed to this version chugging on a SSD. ![]() Its working well, and as to be expected faster then my bootcamp partition. Anyways long story short, I have windows running on an external drive. WinToUSB basically does the same thing, but doesn’t always work because WinToUSB doesn’t really take into account between BIOS-CSM and UEFI Macs it only uses one method for all (which may result in boot failures and other problems).Ĭlick to expand.I used this method yesterday after trying and failing to use WinToUSB, for some reason it just didn't like the partition on my SSD to install the OS on. Attempts to boot a UEFI installation of Windows on an Ivy Bridge or earlier Mac will result in driver issues. Ivy Bridge and earlier Macs can only run Windows in BIOS-CSM flawlessly. However, you must format the TB drive as GPT first.ĬAUTION: Windows can only be installed in UEFI flawlessly on Haswell Macs and later. ![]() Windows sees TB drives as an internal PCIe connection. Note: This method involves reformatting the entire external drive.įor Thunderbolt drives, just boot from the Windows USB installer and install directly onto the TB drive. If you have neither, stick back to the internal drive If you don't have USB 3, use Thunderbolt. ![]()
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