Windows 8 install problem MBR-GPT

So I wanted ti install windows 8 by using bootcamp. I have an iMac mid 2011 21,5'' and Lion. Everything goes ok until I have to pick the disk I want to instal windows. I get the message  "Windows cannot be installed to this disk. The selected disk has an MBR partition table. Pn EFI systems Windows can only be installed to GPT disks. Windows cannot be installed to this disk. This computer's hardware may not support booting to this disk. Ensure that the disk's controller is enabled in the computer's BIOS menu" If I try to erase the disk and format it from windows setup I get an error. If I just reformat it I still get the above message abou GPT
Here's a screenshot.... PLEASE HELP ME!!!!

yours sounds like it has two disk drives present and that is why.
details details - one drive for OS X and Windows partitions works / one drive for Windows only and you have to pull the other.
Anyone with a Mac Pro with 4 hard drives knows, but is very easy to slide out and remove drive trays, to only have one drive present - the one where Windows will be installed.
You can unplug a drive. You can backup and format a drive to MBR w/ FAT while you install on another.
Windows 8 does support UEFI, and EFI requires GPT, but not have Apple and OS X on another drive, and Apple EFI is proprietary variant.

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