“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