bootcamp windows 10 working

“Windows cannot be installed on to this disk. The selected disk is of the GPT partition style”

https://macriot.com/mcrt/?p=2362

• Boot into OS X
• Download GPT fdisk utility (gdisk) from Sourceforge and install it
• Launch Disk Utility (/Applications/Utilities/Disk Utility.app)
• In the left pane select the Hard Drive (not Volume) which contains the OS X and BOOTCAMP partitions that BCA has created for you and click on the Disk Utility Info button (CMD+I)
• In the Info window, note down the Disk Identifier value of your hard drive, e.g. in the example below the Disk Identifier is “disk0”

• Launch Terminal (/Applications/Utilities/Terminal.app)
• Launch gdisk in terminal by copying and pasting the following text into Terminal without the quotes, “sudo gdisk /dev/disk0”, enter your system admin password when prompted

In our example our Disk Identifier is “disk0”. Replace “disk0” with the corresponding Disk Identifier of your hard drive. For example, if your Disk Identifier is “disk1” then the appropriate Terminal command to launch gdisk would instead be “sudo gdisk /dev/disk1“.

•  Type “p” to view the partition table to confirm it is the correct hard drive you want to work on, if not type “q” to quit gdisk without making any changes and try again with another disk
• Assuming you have the correct disk (i.e. entered the correct Disk Identifier to launch gdisk), type “x” to enter the experts menu
• Type “n” to create a fresh protective MBR; note upon completion gdisk will not confirm a change or display any indication anything has been done, it will just show you another experts menu prompt
• Type “w” to save the changes you have made, confirm this action when prompted to do so
• Quit Terminal
• Shutdown your Mac and unplug ALL other hard drives other than the hard drive you intend to install Windows 8/8.1 on. Also unplug all SSD cards or USB drives attached to your Mac

“We couldn’t create a new partition or locate an existing one. For more information see the Setup log files.” 

Microsoft has piracy protections built into Windows 8/8.1 that prevents installation of Windows 8/8.1 on anything other than the primary boot disk/partition; if you do not unplug all other storage media during the Windows 8/8.1 the above error message will be displayed

• Reboot your Mac whilst holding down the Option key and Boot into the “EFI Boot” disk to continue Windows 8/8.1 installation

• You will need to hit the Format button in the Windows Setup window to reformat the BOOTCAMP partition but this time no GPT error should result