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I changed in my iMac’s optical drive with an SSD. Now I have the original 1 TB HDD (which is for my backup), 2 SSD’s: One 500 GB with MacOS and the second 1 TB where I’m trying without success to install again bootcamp. I’m always getting strange errors like: Windows cannot be installed. The selected disk has an MBR partition table. On EFI systems Windows can only be installed to gpt diskWindows cannot be installed to this hdd. Windows must be installed to a partition formatted as NTFS.When I format partition and installation proceed ( same as in forums support from apple) I got some strange error code 0x000005 I must to mention I never had this issue before when I put MS Windows with bootcamp on my system. These support forums from Apple doesn’t help : https://help.apple.com/bootcamp/mac/5.0/...https://discussions.apple.com/thread/547

You’re hitting a known limitation of BootCamp. The boot drive needs to host both MacOS & MS Windows. You can then use a second drive (partitioned) to hold your Mac & Windows apps and/or data. Update (08/04/2017) Back with Lion, you could cheat by booting up with the second drive (both have OS-X) do the BootCamp & Windows install then reboot under the primary drive go into an editor and alter the drive pathing. Windows 7 & onwards uses a different approach in the OS installer than Windows XP. I was never able to do it with Windows 7. I think you’re just expecting more than what the BootCamp was intended to do. I would recommend you get Parallels Desktop or VMWare Fusion. These are real VM servers and allow much more than what BootCamp offers.