7 Replies Latest reply: Jan 23, 2014 7:16 AM by Number88
DavidKop_ Level 1 Level 1

Hi guys,

 

yesterday, I decided to install Windows 8.1 on my Mac using Boot Camp. I tried to install it, but the first attempt ended into booting to the screen, where it says "Cannot find any bootable device" or something like that. So I googled it up and then tried the EFI Boot. The EFI Boot booted into the Windows installation properly, but I cannot choose the partition I want to install it on. I tried partitioning it in Disk Utility using Tuxera to NTFS, I tried formatting it in the installation itself, always restarted between the processes, I tried to delete the partition and create a new one in the installation, but no luck. I am still stuck on the error "Cannot install Windows on MBR partition. Please, choose a GPT partition". I have a 256GB SSD disk. I browsed the problems and solutions for 3 hours, but no luck. None of the solution helps. The only solution that would work I guess is if I don’t boot into EFI, but into the BIOS installation. But when I do that, I get the "Cannot find any bootable device", so a dead end here. I also tried the tips where they say to remove the USB stick when the Windows installation starts, but didn’t help either.

 

I am installing using a bootable USB drive, I do not have a Superdrive and cannot even lend it or something like that.

 

I am really desperate, can anyone please help me?

 

Thanks in advance,

DavidKop_


MacBook Pro with Retina display, OS X Mavericks (10.9.1), Boot Camp EFI Boot MBR GPT Windows
Solved by DavidKop_ on Jan 23, 2014 4:41 AM Solved
Oh, isn’t it? I did some research on Google and I deducted that it is supported. I tried it using this article http://forums.macrumors.com/showthread.php?t=1671442.  I prepared the USB normally throught Boot Camp. I inserted the Win 8.1 ISO image and it started preparing with no problem at all, so I thought it would work. Thanks for the heads up.
Reply by Number88 on Jan 23, 2014 4:08 AM Helpful
Windows 8.1 is not yet supported by Bootcamp.Out of interest how did you prepare the USB?
Reply by Number88 on Jan 23, 2014 4:50 AM Helpful
Some people have been successful installing 8.1 (me, for instance) despite it not being supported. However this seems to be hardware dependent.I would have expected the normal WININSTALL option to be available on a Bootcamp-created USB, not just the EFI boot option.It really depends on whether Bootcamp is creating a hybrid MBR when it creates the Bootcamp partition. Some later model Macs do not. On the Macs that do not create the hybrid MBR Windows may install in EFI mode. If you remove everything and stretch the Macintosh HD back to the full size of the disc again then reboot and when the system restarts begin the Bootcamp installation again but do not let it restart at that time, you can then run the following code in the terminal and report its output we will be able to see if a hybrid MBR has been created (this is after the partition has been created by Bootcamp, but before it reboots). sudo fdisk /dev/disk0

All replies

  • Number88 Level 3 Level 3

    Windows 8.1 is not yet supported by Bootcamp.

    Out of interest how did you prepare the USB?

  • DavidKop_ Level 1 Level 1

    Oh, isn’t it? I did some research on Google and I deducted that it is supported. I tried it using this article http://forums.macrumors.com/showthread.php?t=1671442.

     

    I prepared the USB normally throught Boot Camp. I inserted the Win 8.1 ISO image and it started preparing with no problem at all, so I thought it would work.

     

    Thanks for the heads up.

  • Number88 Level 3 Level 3

    Some people have been successful installing 8.1 (me, for instance) despite it not being supported. However this seems to be hardware dependent.

    I would have expected the normal WININSTALL option to be available on a Bootcamp-created USB, not just the EFI boot option.

    It really depends on whether Bootcamp is creating a hybrid MBR when it creates the Bootcamp partition. Some later model Macs do not. On the Macs that do not create the hybrid MBR Windows may install in EFI mode.

     

    If you remove everything and stretch the Macintosh HD back to the full size of the disc again then reboot and when the system restarts begin the Bootcamp installation again but do not let it restart at that time, you can then run the following code in the terminal and report its output we will be able to see if a hybrid MBR has been created (this is after the partition has been created by Bootcamp, but before it reboots).

     

    sudo fdisk /dev/disk0

  • DavidKop_ Level 1 Level 1

    The normal WININSTALL option is availible, but when you select it, it shows the "Cannot find bootable device" error.

     

    Does it mean I would have to wipe the whole Macintosh HD? I’d rather wait for the official support of W8.1 from Apple.

     

    Thanks anyway.

  • Number88 Level 3 Level 3

    I understand.

    Is anything else plugged in at this time? I don't know why the EFI boot option would boot but the WININSTALL option would not. That's odd.

     

    It would indeed be much easier, not to mention less of a headache, to wait for full Windows 8.1 support from Apple.

  • DavidKop_ Level 1 Level 1

    No, tried that, too. Nothing else was plugged. Only the adapter.

     

    I'm just going to wait for the official support from Apple. Much easier I'd say.

  • Number88 Level 3 Level 3

    You're right