Need to help install windows 8.1 EFI on iMac late 2013

Discussion in 'iMac' started by blackwhite999, Jan 11, 2015.

  1. blackwhite999 macrumors member

    blackwhite999

    Joined:
    Apr 2, 2011
    #1
    hi everyone,
    anyone have a tutorial how to install windows 8.1 with EFI on iMac 14.2 lated 2013 help me pls!
    thanks you !
     
  2. yjchua95, Jan 11, 2015
    Last edited: Jan 12, 2015

    yjchua95 macrumors 604

    Joined:
    Apr 23, 2011
    Location:
    GVA, KUL, MEL (current), ZQN
    #2
    If it's in the internal drive, just use Boot Camp Assistant. Haswell and later Macs will install Windows natively in UEFI via Boot Camp.

    If it's on an external USB/TB drive, follow these steps:

    Connect external drive to Windows VM. You must have a Windows VM in VMware/Parallels, or a Windows PC. Any existing Windows environment will do.

    What you need:
    install.wim file (obtain this from your Windows ISO)

    Open elevated cmd.exe

    Note: All commands aren't case sensitive, including pathway to files.

    Type diskpart
    Type list disk
    Take note of the disk you want to select
    Type select disk 1 (if your disk is Disk 1)
    Type clean
    Type convert gpt
    Type create partition EFI size=100
    Type format quick fs=fat32 label=EFI
    Type assign letter=S
    Type create partition primary
    Type format fs=ntfs quick label=W2G (or any other name you wish for label)
    Type assign letter=E
    Type exit

    Open up File Explorer. In your C drive, create a new folder named WIN2GO.
    Put the install.wim file in this folder

    Back in cmd.exe:
    Type dism /apply-image /imagefile:C:\WIN2GO\install.wim /index:1 /applydir:E:\ (this process will take quite a while)
    Type E:\Windows\System32\bcdboot E:\Windows /s S: /f UEFI

    Restart your entire Mac. After the chime, hold down Option and when prompted to select your boot drive, select EFI Boot.

    Proceed installation normally.

    After installation, install Boot Camp drivers.
     
  3. blackwhite999 thread starter macrumors member

    blackwhite999

    Joined:
    Apr 2, 2011
    #3
    i do that but i got problem: WE COULDN’T CREATE A NEW PARTITION OR LOCATE AN EXISTING ONE. FOR MORE INFORMATION, SEE THE SETUP LOG FILES

    pls help
     
  4. yjchua95 macrumors 604

    Joined:
    Apr 23, 2011
    Location:
    GVA, KUL, MEL (current), ZQN
    #4
    Did you get that from the Windows installer or while in Boot Camp Assistant?

    You may have to run this Terminal command first: http://awesometoast.com/yosemite-core-storage-and-partition-woes/
     
  5. blackwhite999 thread starter macrumors member

    blackwhite999

    Joined:
    Apr 2, 2011
    #5

    Attached Files:

  6. applebutter macrumors newbie

    Joined:
    Oct 30, 2014
    #6
    I gota say your method is awesome!
     
  7. yjchua95 macrumors 604

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    Location:
    GVA, KUL, MEL (current), ZQN
    #7
    Originally I was able to get it running in emulated BIOS in a much easier way, but since I wanted UEFI, it added quite some extra steps.

    But it's totally worth it. Now I can just plug in my JetDrive USB SSD into any computer, be it Mac or PC, and boot into Windows in UEFI. It's basically a DIY Windows to Go boot drive.
     
  8. carlob macrumors member

    Joined:
    Nov 23, 2014
    #8
    Can you do it without a virtual machine? I have a windows laptop I could use.
    Thanks!
     
  9. yjchua95 macrumors 604

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    GVA, KUL, MEL (current), ZQN
    #9
    Yes you can. Any existing Windows environment will do.
     
  10. carlob macrumors member

    Joined:
    Nov 23, 2014
    #10
    I was trying to use that guide but the ISO that you create from Microsoft site does not contain the install.wim file.
    There is a boot.wim but not sure it's the same
     
  11. yjchua95 macrumors 604

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    Location:
    GVA, KUL, MEL (current), ZQN
    #11
    If you don't have an install.wim file, then there should be a install.esd file.

    Here's how to convert the install.esd file to install.wim : http://www.intowindows.com/how-to-easily-convert-install-esd-to-install-wim/
     
  12. carlob macrumors member

    Joined:
    Nov 23, 2014
    #12
    Thank you, I found a workaround to get a regular ISO file. Right now I'm waiting for the imaging to complete, I think it's been probably 20 minutes and still at 95%.
     
  13. yjchua95 macrumors 604

    Joined:
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    GVA, KUL, MEL (current), ZQN
    #13
    It only took 4 minutes in my case.

    But then, I was imaging it to an external USB 3 SSD :)
     
  14. carlob macrumors member

    Joined:
    Nov 23, 2014
    #14
    Me too, is a Samsung 850 EVO in a USB 3 enclosure. Anyways it works like a charm, just completed Win installation now I'm going to install bootcamp drivers :)
     
  15. yjchua95 macrumors 604

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    #15
    You owe me a beer :)
     
  16. Chippy99 macrumors 6502a

    Joined:
    Apr 28, 2012
    #16
    It's a while since I did this, but another easy way is simply to install Windows on your internal drive as normal and then use Winclone to move it to an external drive. If you don't want to go messing with extracting files and command prompts and diskpart and everything else.

    You'd need to buy Winclone, but then again, if you do want to be able to back up your Windows installation from time to time, it's a useful utility to own.
     
  17. carlob macrumors member

    Joined:
    Nov 23, 2014
    #17
    Make it two, only problem is that you're down under!

    ----------

    That's exactly what I did not want to do, messing with my internal ssd, partitioning and removing partitions, buying software etc. This guide is really great and you don't really need special skills to type a few commands at the prompt.
     
  18. Chippy99 macrumors 6502a

    Joined:
    Apr 28, 2012
    #18
    Fair enough!
     

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