Wow, thanks for the info. I had no idea that Disk Utility transformed a GPT disk into Hybrid MBR just because I selected to create a FAT partition on it.
When you tell Apple's Disk Utility to create a FAT partition, it converts the disk from a GPT format into a hybrid MBR.
I would love to check, but I already gave the hackintosh away and can't.
If you want to check this, I recommend you run my GPT fdisk (gdisk) program on the disk.
I might work on another OSx86 installation in the near future, and I will modify the procedure to create an HFS+ volume for Windows instead of FAT. AFAIK, Winclone can restore a Windows image into an existing HFS+ volume (automatically converting it to NTFS), so it should then overcome the issue of Disk Utility formatting the disk as Hybrid MBR. I'll use your utility to check whether it was successful.
It's awesome that more motherboards are being sold with UEFI. UEFI DUET looks really interesting but complicated. If further Winclone testing doesn't yield a pure GPT scheme, I might give it a try on another OSx86 installation.
AFAIK, the only way to boot Windows on a pure GPT disk is to use a UEFI implementation. Many motherboards introduced this year, and a few sold in previous years, provide a UEFI boot option. It's also possible to add UEFI support to many non-UEFI motherboards by using UEFI DUET, as described here, although the software and procedures for doing that should be considered highly experimental.
Thanks for such an informative post!