dual boot windows 10/yosemite. cannot install windows 10

hi guys, i cannot install windows 10 in the same hdd of yosemite. After installed OS X with clover uefi, i try to install windows 10 (with usb installer UEFI), usb boots but when i select a partition windows says that i cannot install it in this partition.

Hard disk is subdivided in two partition: OS X partition in journaled extended, and windows in ntfs. Partition scheme is GPT

Sbrillo said:

hi guys, i cannot install windows 10 in the same hdd of yosemite. After installed OS X with clover uefi, i try to install windows 10 (with usb installer UEFI), usb boots but when i select a partition windows says that i cannot install it in this partition.

Hard disk is subdivided in two partition: OS X partition in journaled extended, and windows in ntfs. Partition scheme is GPT

Click to expand...

Do not create any Windows partitions in Disk Utility. If you do, Disk Utility will create a hybrid MBR/GPT which will be seen by Windows as MBR only. You cannot install Windows UEFI to MBR. Create all Windows partitions you need inside of the Windows installer.

so, now i boot in yosemite and cancel windows partition, then boot usb windows installer and create all partition here?


yes, it works. thank you!

windows works, i have installed clover after windows installation but clover won't start. windows boots every time

Sbrillo said:

windows works, i have installed clover after windows installation but clover won't start. windows boots every time

Click to expand...

Rename \EFI\Microsoft\Boot\bootmgfw.efi to bootmgfw-orig.efi.

There are specific issues with Windows 10 install and update routines which are the likely source of your problem. Installing and upgrading Win 10 betas is not like installing commercial versions of Win 7/8.

If you have been unable to install Win 10:

The best (only) way I know of to get the current windows 10 iso to install properly is on its own drive in the one and only partition on that drive. I am certain you can not install Win 10 on the second partition of a combined OS X/Windows drive and if you persist on trying you will probably lose your OS X installation. The other key thing is that one has to disconnect all other drives before installing Win 10 including USB but not optical, something I discovered after a web search and you can too. Win 10 will muck with the UEFI settings but if you are smart enough to get clover to work you can fix that. If you have problems with multi booting at least on this Gigabyte motherboard I had to resolve that by identifying in the UEFI each drive as bootable that has a bootable OS. something I never had to do before Win 10.

I use chimera: resetting the UEFI and booting via chimera then works with chimera recognizing Win 10 (and Yosemite--what I am typing this in-- and Win 8).
When there is a new Win 10 download, as there is almost weekly, you can only get the upgrade to install if, after it finishes downloading via update, you shut down and unplug all other hard drives (usb too) and boot to the Win 10 drive. Again when I reconfigure the UEFI chimera recognizes Yosemite, Win 10 and Win 8. So far. Very hands on.

I get why people want to look at Win 10. For whatever reason MS has made installation of the public beta much less user friendly than it was with Win 7/8 or the difficulty is part of some new security/DRM thing. As you are doubtless aware certain key features are not yet working, particularly DX12 (unless that changed today). I am not sure it is worth the effort but if one is obsessive/compulsive enough it can be done.

I have no clue about Clover. However if Win 10 is installed on its own drive and you have reconfigured the UEFI to boot to your OS X drive you can always hit the appropriate key at boot to choose the boot device as the Win 10 drive.

bmoag said:

...
The best (only) way I know of to get the current windows 10 iso to install properly is on its own drive in the one and only partition on that drive. I am certain you can not install Win 10 on the second partition of a combined OS X/Windows drive and if you persist on trying you will probably lose your OS X installation.

Click to expand...

I'm running Win8.1, Win10, and Yosemite on a single drive using Clover UEFI. No issues...

hello, i've been trying to achieve this for a week and im really frustrated. i hope you guy can give me some tips. i have a 480gb ssd for windows 10 and a 3tb hdd for yosemite. i installed both successfully, (windows 10 legacy) but cant get chimera or clover to work, i can only boot them using the Unibeast USB. i tried to install Windows 10 on UEFI mode; after making a bootable usb, GTP (also tried MBR) for UEFI, FAT32 with Rufus, the computer wont boot it, keeps saying Insert boot media... i tried placing bootx64.efi (extracted from some *.wim file of the installer) on the efi/boot folder of the usb with no success, still unbootable
any recommendations for Bios settings?UEFI only? should i install Windows 10 on GPT or MBR?
please help, thanks in advance

stahlmannx76 said:

hello, i've been trying to achieve this for a week and im really frustrated. i hope you guy can give me some tips. i have a 480gb ssd for windows 10 and a 3tb hdd for yosemite. i installed both successfully, (windows 10 legacy) but cant get chimera or clover to work, i can only boot them using the Unibeast USB. i tried to install Windows 10 on UEFI mode; after making a bootable usb, GTP (also tried MBR) for UEFI, FAT32 with Rufus, the computer wont boot it, keeps saying Insert boot media... i tried placing bootx64.efi (extracted from some *.wim file of the installer) on the efi/boot folder of the usb with no success, still unbootable
any recommendations for Bios settings?UEFI only? should i install Windows 10 on GPT or MBR?
please help, thanks in advance

Click to expand...

Creating a Win10 USB for UEFI is easy.

In Windows:
- format USB as MBR, single FAT32 partition
- open the ISO
- copy the contents of the ISO to the root of the USB/FAT32 partition

Now boot it UEFI with your BIOS boot menu (read your user manual to determine the special key/button used to access the boot menu)

Note: BIOS boot menu is not the same as BIOS setup.

thanks for the quick reply man!! long story short, my motherboard was defective; most of the time never posts; fans spin but no video or beep. I'm looking for another model/brand to replace it tomorrow at micro center. Any recommendation? btw ill definitely try your method tomorrow. thanks again bro